reglab/statecodes huggingface dataset:
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2105 - QUALITY ASSURANCE › Subsection 2105.2 - Acceptance relative to strength requirements

Current through Register 1525, July 5, 2024
2105.2.1
Compliance with
f
'
m and
f
'
AAC.
Compressive strength
				of masonry shall be considered satisfactory if the compressive strength of each
				masonry wythe and grouted collar joint equals or exceeds the value of
f
				'
m for clay and concrete masonry and
f
				'
AAC for AAC masonry. For partially grouted
				clay and concrete masonry, the compressive strength of both the grouted and
				ungrouted masonry shall equal or exceed the applicable
f
				'
m. At the time of prestress, the compressive
				strength of the masonry shall equal or exceed
f
				'
mi, which shall be less than or equal to
f '
m.
2105.2.2
Determination of compressive
				strength.
The compressive strength for each wythe shall be determined by
				the unit strength method or by the prism test method as specified herein.
2105.2.2.1
Unit strength method.
2105.2.2.1.1
Clay masonry.
The
				compressive strength of masonry shall be determined based on the strength of
				the units and the type of mortar specified using Table 2105.2.2.1.1, provided:
1. Units are sampled and tested to verify
				compliance with ASTM C 62, ASTM C 216 or ASTM C 652.
2. Thickness of bed joints does not exceed
				5/8 inch (15.9 mm).
3. For grouted masonry, the grout meets one
				of the following requirements:
3.1. Grout
				conforms to Article 2.2 of TMS 602/ACI 530.1/ASCE 6.
3.2. Minimum grout compressive strength
				equals or exceeds
f
m but not less than
				2,000 psi (13.79 MPa). The compressive strength of grout shall be determined in
				accordance with ASTM C 1019.
TABLE 2105.2.2.1.1 COMPRESSIVE STRENGTH OF CLAY
				  MASONRY
NET AREA COMPRESSIVE STRENGTH OF
							 CLAY MASONRY UNITS (psi)
NET AREA COMPRESSIVE STRENGTH OF
							 MASONRY (psi)
Type M or S mortar
Type N mortar
1,700
2,100
1,000
3,350
4,150
1,500
4,950
6,200
2,000
6,600
8,250
2,500
8,250
10,300
3,000
9,900
-
3,500
11,500
-
4,000
For SI: 1 pound per square inch = 0.00689 MPa.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2105 - QUALITY ASSURANCE › Subsection 2105.3 - Testing prisms from constructed masonry

Current through Register 1525, July 5, 2024
When
approved
by the
building
				  official
, acceptance of masonry that does not meet the requirements of
				  Section 2105.2.2.1 or 2105.2.2.2 shall be permitted to be based on tests of
				  prisms cut from the masonry construction in accordance with Sections 2105.3.1,
				  2105.3.2 and 2105.3.3.
2105.3.1
Prism sampling and removal.
A set of three masonry prisms that are at
				least 28 days old shall be saw cut from the masonry for each 5,000 square feet
				(465 m2) of the wall area that is in question but
				not less than one set of three masonry prisms for the project. The length,
				width and height dimensions of the prisms shall comply with the requirements of
				ASTM C 1314. Transporting, preparation and testing of prisms shall be in
				accordance with ASTM C 1314.
2105.3.2
Compressive strength
				calculations.
The compressive strength of prisms shall be the value
				calculated in accordance ASTM C 1314, except that the net cross-sectional area
				of the prism shall be based on the net mortar bedded area.
2105.3.3
Compliance.
Compliance
				with the requirement for the specified compressive strength of masonry,
f '
m, shall be considered satisfied
				provided the modified compressive strength equals or exceeds the specified
f '
m. Additional testing of specimens
				cut from locations in question shall be permitted.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2106 - SEISMIC DESIGN › Subsection 2106.1 - Seismic design requirements for masonry

Current through Register 1525, July 5, 2024
Masonry structures and components shall comply with the
				  requirements in Section 1.17 of TMS 402/ACI 530/ASCE 5 depending on the
				  structure's
seismic design category
as determined in Section
				  1613.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2107 - ALLOWABLE STRESS DESIGN › Subsection 2107.1 - General

Current through Register 1525, July 5, 2024
The design of masonry structures using
allowable
				  stress design
shall comply with Section 2106 and the requirements of
				  Chapters 1 and 2 of TMS 402/ACI 530/ASCE 5 except as modified by Sections
				  2107.2 through 2107.5.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2107 - ALLOWABLE STRESS DESIGN › Subsection 2107.2 - TMS 402/ACI 530/ASCE 5, Section 2.1.2, load combinations

Current through Register 1525, July 5, 2024
Delete Section 2.1.2.1.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2107 - ALLOWABLE STRESS DESIGN › Subsection 2107.3 - TMS 402/ACI 530/ASCE 5, Section 2.1.9.7.1.1, lap splices

Current through Register 1525, July 5, 2024
Modify Section 2.1.9.7.1.1 as follows:
2.1.9.7.1.1 The minimum length of lap splices
				for reinforcing bars in tension or compression,
l
d, shall be
l
d =
							 0.002
d
b
f
s
(Equation 21-1)
For SI:
l
d =
				  0.29
d
b
f
s
but not less than 12 inches (305 mm). In no case shall the
				  length of the lapped splice be less than 40 bar diameters.
where:
d
b = Diameter of
				  reinforcement, inches (mm).
f
s = Computed stress
				  in reinforcement due to design loads, psi (MPa).
In regions of moment where the design tensile stresses in the
				  reinforcement are greater than 80 percent of the allowable steel tension
				  stress,
F
s, the lap length of splices
				  shall be increased not less than 50 percent of the minimum required length.
				  Other equivalent means of stress transfer to accomplish the same 50 percent
				  increase shall be permitted. Where epoxy coated bars are used, lap length shall
				  be increased by 50 percent.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2107 - ALLOWABLE STRESS DESIGN › Subsection 2107.4 - TMS 402/ACI 530/ASCE 5, Section 2.1.9.7, splices of reinforcement

Current through Register 1525, July 5, 2024
Modify Section 2.1.9.7 as follows:
2.1.9.7 Splices of reinforcement. Lap
				splices, welded splices or mechanical splices are permitted in accordance with
				the provisions of this section. All welding shall conform to AWS D1.4. Welded
				splices shall be of ASTM A706 steel reinforcement. Reinforcement larger than
				No. 9 (M #29) shall be spliced using mechanical connections in accordance with
				Section 2.1.9.7.3.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2108 - STRENGTH DESIGN OF MASONRY › Subsection 2108.1 - General

Current through Register 1525, July 5, 2024
The design of masonry structures using strength design shall
				  comply with Section 2106 and the requirements of Chapters 1 and 3 of TMS
				  402/ACI 530/ASCE 5, except as modified by Sections 2108.2 through
				  2108.3.
Exception:
AAC masonry shall comply with the
				  requirements of Chapter 1 and Appendix A of TMS 402/ACI 530/ASCE
				  5.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2108 - STRENGTH DESIGN OF MASONRY › Subsection 2108.2 - TMS 402/ACI 530/ASCE 5, Section 3.3.3.3 development

Current through Register 1525, July 5, 2024
Modify the second paragraph of Section 3.3.3.3 as
				  follows:
The required development length of reinforcement shall be
				  determined by Equation (3-16), but shall not be less than 12 inches (305 mm)
				  and need not be greater than 72
d
b.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2109 - EMPIRICAL DESIGN OF MASONRY › Subsection 2109.1 - General

Current through Register 1525, July 5, 2024
Empirically designed masonry shall conform to the
				  requirements of Chapter 5 of TMS 402/ACI 530/ASCE 5, except where otherwise
				  noted in this section.
2109.1.1
Limitations.
The use of empirical design of masonry shall be limited as
				noted in Section 5.1.2 of TMS 402/ACI 530/ASCE 5. The use of dry-stacked,
				surface- bonded masonry shall be prohibited in
Occupancy
				Category
IV structures. In buildings that exceed one or more of the
				limitations of Section 5.1.2 of TMS 402/ACI 530/ASCE 5, masonry shall be
				designed in accordance with the engineered design provisions of Section
				2101.2.1, 2101.2.2 or 2101.2.3 or the foundation wall provisions of Section
				1807.1.5.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2109 - EMPIRICAL DESIGN OF MASONRY › Subsection 2109.2 - Surface-bonded walls

Current through Register 1525, July 5, 2024
Dry-stacked, surface-bonded concrete masonry walls shall
				  comply with the requirements of Chapter 5 of TMS 402/ACI 530/ASCE 5, except
				  where otherwise noted in this section.
2109.2.1
Strength.
Dry-stacked,
				surface-bonded concrete masonry walls shall be of adequate strength and
				proportions to support all superimposed loads without exceeding the allowable
				stresses listed in Table 2109.2.1. Allowable stresses not specified in Table
				2109.2.1 shall comply with the requirements of TMS 402/ACI 530/ASCE 5.
TABLE 2109.2.1 ALLOWABLE STRESS GROSS CROSS-SECTIONAL
				  AREA FOR DRY-STACKED, SURFACE-BONDED CONCRETE MASONRY WALLS
DESCRIPTION
MAXIMUM ALLOWABLE STRESS (psi)
Compression standard block
45
Flexural tension
Horizontal
							 span
Vertical span
30
18
Shear
10
For SI: 1 pound per square inch = 0.006895 MPa.
2109.2.2
Construction.
Construction of dry-stacked, surface-bonded masonry walls, including stacking
				and leveling of units, mixing and application of mortar and curing and
				protection shall comply with ASTM C 946.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2109 - EMPIRICAL DESIGN OF MASONRY › Subsection 2109.3 - Adobe construction

Current through Register 1525, July 5, 2024
Adobe construction shall comply with this section and shall
				  be subject to the requirements of this code for Type V construction, Chapter 5
				  of TMS 402/ACI 530/ASCE 5, and this section.
2109.3.1
Unstabilized adobe.
2109.3.1.1
Compressive strength.
Adobe units shall have an average compressive strength of 300 psi (2068 kPa)
				when tested in accordance with ASTM C 67. Five samples shall be tested and no
				individual unit is permitted to have a compressive strength of less than 250
				psi (1724 kPa).
2109.3.1.2
Modulus of rupture.
Adobe units shall have an average modulus of
				rupture of 50 psi (345 kPa) when tested in accordance with the following
				procedure. Five samples shall be tested and no individual unit shall have a
				modulus of rupture of less than 35 psi (241 kPa).
2109.3.1.2.1
Support conditions.
A cured unit shall be simply supported by 2-inch-diameter (51 mm) cylindrical
				supports located 2 inches (51 mm) in from each end and extending the full width
				of the unit.
2109.3.1.2.2
Loading conditions.
A 2-inch-diameter (51 mm) cylinder shall be
				placed at midspan parallel to the supports.
2109.3.1.2.3
Testing procedure.
A vertical load shall be applied to the cylinder at the rate of 500 pounds per
				minute (37 N/s) until failure occurs.
2109.3.1.2.4
Modulus of rupture
				determination.
The modulus of rupture shall be determined by the
				equation:
f
r = 3
PL
s /2
S
w
							 (
S
t2)
(Equation 21-2)
where, for the purposes of this section only:
S
w = Width of the
				  test specimen measured parallel to the loading cylinder, inches (mm).
f
r = Modulus of
				  rupture, psi (MPa).
L
s = Distance between
				  supports, inches (mm).
S
t = Thickness of the
				  test specimen measured parallel to the direction of load, inches (mm).
P
= The applied load at failure, pounds
				  (N).
2109.3.1.3
Moisture content requirements.
Adobe units shall have a moisture
				content not exceeding 4 percent by weight.
2109.3.1.4
Shrinkage cracks.
Adobe units shall not contain more than three shrinkage cracks and any single
				shrinkage crack shall not exceed 3 inches (76 mm) in length or
				1/8 inch (3.2 mm) in width.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2110 - GLASS UNIT MASONRY › Subsection 2110.1 - General

Current through Register 1525, July 5, 2024
Glass unit masonry construction shall comply with Chapter 7
				  of TMS 402/ACI 530/ASCE 5 and this section.
2110.1.1
Limitations.
Solid or
				hollow
approved
glass block shall not be used in fire walls,
				party walls, fire barriers, fire partitions or smoke barriers, or for
				load-bearing construction. Such blocks shall be erected with mortar and
				reinforcement in metal channel-type frames, structural frames, masonry or
				concrete recesses, embedded panel anchors as provided for both exterior and
				interior walls or other
approved
joint materials. Wood strip
				framing shall not be used in walls required to have a fire-resistance rating by
				other provisions of this code.
Exceptions:
1. Glass-block assemblies having a fire
				protection rating of not less than
				3/4 hour shall be permitted
				as opening protectives in accordance with Section 715 in fire barriers, fire
				partitions and smoke barriers that have a required fire-resistance rating of 1
				hour or less and do not enclose exit stairways, exit ramps or exit
				passageways.
2. Glass-block
				assemblies as permitted in Section 404.6, Exception 2.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.1 - Definition

Current through Register 1525, July 5, 2024
A masonry fireplace is a fireplace constructed of concrete
				  or masonry. Masonry fireplaces shall be constructed in accordance with this
				  section.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.2 - Footings and foundations

Current through Register 1525, July 5, 2024
Footings for masonry fireplaces and their chimneys shall be
				  constructed of concrete or solid masonry at least 12 inches (305 mm) thick and
				  shall extend at least 6 inches (153 mm) beyond the face of the fireplace or
				  foundation wall on all sides. Footings shall be founded on natural undisturbed
				  earth or engineered fill below frost depth. In areas not subjected to freezing,
				  footings shall be at least 12 inches (305 mm) below finished grade.
2111.2.1
Ash dump cleanout.
Cleanout openings, located within foundation walls below fireboxes, when
				provided, shall be equipped with ferrous metal or masonry doors and frames
				constructed to remain tightly closed, except when in use. Cleanouts shall be
				accessible and located so that ash removal will not create a hazard to
				combustible materials.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.3 - Seismic reinforcing

Current through Register 1525, July 5, 2024
Masonry or concrete fireplaces shall be constructed,
				  anchored, supported and reinforced as required in this chapter. In
Seismic Design Category
C or D, masonry and concrete
				  fireplaces shall be reinforced and anchored as detailed in Sections 2111.3.1,
				  2111.3.2, 2111.4 and 2111.4.1 for chimneys serving fireplaces. In
Seismic Design Category
A or B, reinforcement and seismic
				  anchorage is not required. In
Seismic Design Category
E or F,
				  masonry and concrete chimneys shall be reinforced in accordance with the
				  requirements of Sections 2101 through 2108.
2111.3.1
Vertical reinforcing.
For fireplaces with chimneys up to 40 inches (1016 mm) wide, four No. 4
				continuous vertical bars, anchored in the foundation, shall be placed in the
				concrete between wythes of solid masonry or within the cells of hollow unit
				masonry and grouted in accordance with Section 2103.12. For fireplaces with
				chimneys greater than 40 inches (1016 mm) wide, two additional No. 4 vertical
				bars shall be provided for each additional 40 inches (1016 mm) in width or
				fraction thereof.
2111.3.2
Horizontal reinforcing.
Vertical reinforcement shall be placed enclosed
				within 1/4-inch (6.4 mm) ties
				or other reinforcing of equivalent net cross-sectional area, spaced not to
				exceed 18 inches (457 mm) on center in concrete; or placed in the bed joints of
				unit masonry at a minimum of every 18 inches (457 mm) of vertical height. Two
				such ties shall be provided at each bend in the vertical bars.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.4 - Seismic anchorage

Current through Register 1525, July 5, 2024
Masonry and concrete chimneys in
Seismic Design
				  Category
C or D shall be anchored at each floor, ceiling or roof line
				  more than 6 feet (1829 mm) above grade, except where constructed completely
				  within the
exterior walls.
Anchorage shall conform to the
				  following requirements.
2111.4.1
Anchorage.
Two
				3/16-inch by 1-inch (4.8 mm
				by 25.4 mm) straps shall be embedded a minimum of 12 inches (305 mm) into the
				chimney. Straps shall be hooked around the outer bars and extend 6 inches (152
				mm) beyond the bend. Each strap shall be fastened to a minimum of four floor
				joists with two 1/2-inch
				(12.7 mm) bolts.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.5 - Firebox walls

Current through Register 1525, July 5, 2024
Masonry fireboxes shall be constructed of solid masonry
				  units, hollow masonry units grouted solid, stone or concrete. When a lining of
				  firebrick at least 2 inches (51 mm) in thickness or other
approved
lining is provided, the minimum thickness of back and
				  sidewalls shall each be 8 inches (203 mm) of solid masonry, including the
				  lining. The width of joints between firebricks shall not be greater than
				  1/4 inch (6.4 mm). When no
				  lining is provided, the total minimum thickness of back and sidewalls shall be
				  10 inches (254 mm) of solid masonry. Firebrick shall conform to ASTM C 27 or
				  ASTM C 1261 and shall be laid with medium-duty refractory mortar conforming to
				  ASTM C 199.
2111.5.1
Steel
				fireplace units.
Steel fireplace units are permitted to be installed
				with solid masonry to form a masonry fireplace provided they are installed
				according to either the requirements of their listing or the requirements of
				this section. Steel fireplace units incorporating a steel firebox lining shall
				be constructed with steel not less than
				1/4 inch (6.4 mm) in
				thickness, and an air-circulating chamber which is ducted to the interior of
				the building. The firebox lining shall be encased with solid masonry to provide
				a total thickness at the back and sides of not less than 8 inches (203 mm), of
				which not less than 4 inches (102 mm) shall be of solid masonry or concrete.
				Circulating air ducts employed with steel fireplace units shall be constructed
				of metal or masonry.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.6 - Firebox dimensions

Current through Register 1525, July 5, 2024
The firebox of a concrete or masonry fireplace shall have a
				  minimum depth of 20 inches (508 mm). The throat shall not be less than 8 inches
				  (203 mm) above the fireplace opening. The throat opening shall not be less than
				  4 inches (102 mm) in depth. The cross-sectional area of the passageway above
				  the firebox, including the throat, damper and smoke chamber, shall not be less
				  than the cross-sectional area of the flue.
Exception:
Rumford fireplaces shall be
				  permitted provided that the depth of the fireplace is at least 12 inches (305
				  mm) and at least one-third of the width of the fireplace opening, and the
				  throat is at least 12 inches (305 mm) above the lintel, and at least
				  1/20 the cross-sectional area
				  of the fireplace opening.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.7 - Lintel and throat

Current through Register 1525, July 5, 2024
Masonry over a fireplace opening shall be supported by a
				  lintel of noncombustible material. The minimum required bearing length on each
				  end of the fireplace opening shall be 4 inches (102 mm). The fireplace throat
				  or damper shall be located a minimum of 8 inches (203 mm) above the top of the
				  fireplace opening.
2111.7.1
Damper.
Masonry fireplaces shall be equipped with a ferrous metal damper
				located at least 8 inches (203 mm) above the top of the fireplace opening.
				Dampers shall be installed in the fireplace or at the top of the flue venting
				the fireplace, and shall be operable from the room containing the fireplace.
				Damper controls shall be permitted to be located in the fireplace.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.8 - Smoke chamber walls

Current through Register 1525, July 5, 2024
Smoke chamber walls shall be constructed of solid masonry
				  units, hollow masonry units grouted solid, stone or concrete. The total minimum
				  thickness of front, back and sidewalls shall be 8 inches (203 mm) of solid
				  masonry. The inside surface shall be parged smooth with refractory mortar
				  conforming to ASTM C 199. When a lining of firebrick at least 2 inches (51 mm)
				  thick, or a lining of vitrified clay at least
				  5/8 inch (15.9 mm) thick, is
				  provided, the total minimum thickness of front, back and sidewalls shall be 6
				  inches (152 mm) of solid masonry, including the lining. Firebrick shall conform
				  to ASTM C 1261 and shall be laid with refractory mortar conforming to ASTM C
				  199. Vitrified clay linings shall conform to ASTM C 315.
2111.8.1
Smoke chamber
				dimensions.
The inside height of the smoke chamber from the fireplace
				throat to the beginning of the flue shall not be greater than the inside width
				of the fireplace opening. The inside surface of the smoke chamber shall not be
				inclined more than 45 degrees (0.76 rad) from vertical when prefabricated smoke
				chamber linings are used or when the smoke chamber walls are rolled or sloped
				rather than corbeled. When the inside surface of the smoke chamber is formed by
				corbeled masonry, the walls shall not be corbeled more than 30 degrees (0.52
				rad) from vertical.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.9 - Hearth and hearth extension

Current through Register 1525, July 5, 2024
Masonry fireplace hearths and hearth extensions shall be
				  constructed of concrete or masonry, supported by noncombustible materials, and
				  reinforced to carry their own weight and all imposed loads. No combustible
				  material shall remain against the underside of hearths or hearth extensions
				  after construction.
2111.9.1
Hearth thickness.
The minimum thickness of fireplace hearths shall be 4
				inches (102 mm).
2111.9.2
Hearth extension thickness.
The minimum thickness of hearth extensions
				shall be 2 inches (51 mm).
Exception:
When the bottom of the firebox
				  opening is raised at least 8 inches (203 mm) above the top of the hearth
				  extension, a hearth extension of not less than
				  3/8-inch-thick (9.5 mm)
				  brick, concrete, stone, tile or other
approved
noncombustible
				  material is permitted.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.10 - Hearth extension dimensions

Current through Register 1525, July 5, 2024
Hearth extensions shall extend at least 16 inches (406 mm)
				  in front of, and at least 8 inches (203 mm) beyond, each side of the fireplace
				  opening. Where the fireplace opening is 6 square feet (0.557
				  m2) or larger, the hearth extension shall extend at
				  least 20 inches (508 mm) in front of, and at least 12 inches (305 mm) beyond,
				  each side of the fireplace opening.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.11 - Fireplace clearance

Current through Register 1525, July 5, 2024
Any portion of a masonry fireplace located in the interior
				  of a building or within the
exterior wall
of a building shall
				  have a clearance to combustibles of not less than 2 inches (51 mm) from the
				  front faces and sides of masonry fireplaces and not less than 4 inches (102 mm)
				  from the back faces of masonry fireplaces. The airspace shall not be filled,
				  except to provide fireblocking in accordance with Section 2111.12.
Exceptions:
1. Masonry fireplaces
listed
and labeled for use in contact with combustibles in accordance with UL 127 and
				installed in accordance with the manufacturer's installation instructions are
				permitted to have combustible material in contact with their exterior
				surfaces.
2. When masonry
				fireplaces are constructed as part of masonry or concrete walls, combustible
				materials shall not be in contact with the masonry or concrete walls less than
				12 inches (306 mm) from the inside surface of the nearest firebox
				lining.
3. Exposed combustible
trim
and the edges of sheathing materials, such as wood
				siding, flooring and drywall, are permitted to abut the masonry fireplace
				sidewalls and hearth extension, in accordance with Figure 2111.11, provided
				such combustible
trim
or sheathing is a minimum of 12 inches
				(306 mm) from the inside surface of the nearest firebox lining.
4. Exposed combustible mantels or
trim
is permitted to be placed directly on the masonry
				fireplace front surrounding the fireplace opening, provided such combustible
				materials shall not be placed within 6 inches (153 mm) of a fireplace opening.
				Combustible material directly above and within 12 inches (305 mm) of the
				fireplace opening shall not project more than
				1/8 inch (3.2 mm) for each
				1-inch (25 mm) distance from such opening. Combustible materials located along
				the sides of the fireplace opening that project more than
				11/2 inches (38 mm) from the
				face of the fireplace shall have an additional clearance equal to the
				projection.
Click to view
							 image
For SI: 1 inch = 25.4 mm.
FIGURE 2111.11 ILLUSTRATION OF EXCEPTION TO FIREPLACE
				  CLEARANCE PROVISION
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.12 - Fireplace fireblocking

Current through Register 1525, July 5, 2024
All spaces between fireplaces and floors and ceilings
				  through which fireplaces pass shall be fireblocked with noncombustible material
				  securely fastened in place. The fireblocking of spaces between wood joists,
				  beams or headers shall be to a depth of 1 inch (25 mm) and shall only be placed
				  on strips of metal or metal lath laid across the spaces between combustible
				  material and the chimney.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2111 - MASONRY FIREPLACES › Subsection 2111.13 - Exterior air

Current through Register 1525, July 5, 2024
Factory-built or masonry fireplaces covered in this section
				  shall be equipped with an exterior air supply to ensure proper fuel combustion
				  unless the room is mechanically ventilated and controlled so that the indoor
				  pressure is neutral or positive.
2111.13.1
Factory-built
				fireplaces.
Exterior combustion air ducts for factory-built fireplaces
				shall be
listed
components of the fireplace, and installed
				according to the fireplace manufacturer's instructions.
2111.13.2
Masonry fireplaces.
Listed
combustion air ducts for masonry fireplaces shall be
				installed according to the terms of their listing and manufacturer's
				instructions.
2111.13.3
Exterior air intake.
The exterior air intake shall be capable of
				providing all combustion air from the exterior of the
dwelling
. The exterior air intake shall not be located within
				a garage,
attic
, basement or crawl space of the
dwelling
nor shall the air intake be located at an elevation
				higher than the firebox. The exterior air intake shall be covered with a
				corrosion-resistant screen of
				1/4-inch (6.4 mm)
				mesh.
2111.13.4
Clearance.
Unlisted combustion air ducts shall be installed with a
				minimum 1-inch (25 mm) clearance to combustibles for all parts of the duct
				within 5 feet (1524 mm) of the duct outlet.
2111.13.5
Passageway.
The
				combustion air passageway shall be a minimum of 6 square inches (3870
				mm2) and not more than 55 square inches (0.035
				m2), except that combustion air systems for
listed
fireplaces or for fireplaces tested for emissions shall
				be constructed according to the fireplace manufacturer's
				instructions.
2111.13.6
Outlet.
The exterior air outlet is permitted to be located in the back
				or sides of the firebox chamber or within 24 inches (610 mm) of the firebox
				opening on or near the floor. The outlet shall be closable and designed to
				prevent burning material from dropping into concealed combustible
				spaces.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2112 - MASONRY HEATERS › Subsection 2112.1 - Definition

Current through Register 1525, July 5, 2024
A masonry heater is a heating appliance constructed of
				  concrete or solid masonry, hereinafter referred to as "masonry," which is
				  designed to absorb and store heat from a solid fuel fire built in the firebox
				  by routing the exhaust gases through internal heat exchange channels in which
				  the flow path downstream of the firebox may include flow in a horizontal or
				  downward direction before entering the chimney and which delivers heat by
				  radiation from the masonry surface of the heater.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2112 - MASONRY HEATERS › Subsection 2112.2 - Installation

Current through Register 1525, July 5, 2024
Masonry heaters shall be installed in accordance with this
				  section and comply with one of the following:
1. Masonry heaters shall comply with the
				requirements of ASTM E 1602; or
2.
				Masonry heaters shall be
listed
and labeled in accordance with
				UL 1482 and installed in accordance with the manufacturer's installation
				instructions.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2112 - MASONRY HEATERS › Subsection 2112.3 - Footings and foundation

Current through Register 1525, July 5, 2024
The firebox floor of a masonry heater shall be a minimum
				  thickness of 4 inches (102 mm) of noncombustible material and be supported on a
				  noncombustible footing and foundation in accordance with Section
				  2113.2.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2112 - MASONRY HEATERS › Subsection 2112.4 - Seismic reinforcing

Current through Register 1525, July 5, 2024
In
Seismic Design Category
D, E and F,
				  masonry heaters shall be anchored to the masonry foundation in accordance with
				  Section 2113.3. Seismic reinforcing shall not be required within the body of a
				  masonry heater with a height that is equal to or less than 3.5 times its body
				  width and where the masonry chimney serving the heater is not supported by the
				  body of the heater. Where the masonry chimney shares a common wall with the
				  facing of the masonry heater, the chimney portion of the structure shall be
				  reinforced in accordance with Section 2113.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2112 - MASONRY HEATERS › Subsection 2112.5 - Masonry heater clearance

Current through Register 1525, July 5, 2024
Combustible materials shall not be placed within 36 inches
				  (765 mm) of the outside surface of a masonry heater in accordance with NFPA
				  211, Section 8-7 (clearances for solid fuel-burning appliances), and the
				  required space between the heater and combustible material shall be fully
				  vented to permit the free flow of air around all heater surfaces.
Exceptions:
1. When the masonry heater wall thickness is
				at least 8 inches (203 mm) thick of solid masonry and the wall thickness of the
				heat exchange channels is at least 5 inches (127 mm) thick of solid masonry,
				combustible materials shall not be placed within 4 inches (102 mm) of the
				outside surface of a masonry heater. A clearance of at least 8 inches (203 mm)
				shall be provided between the gas-tight capping slab of the heater and a
				combustible ceiling.
2. Masonry
				heaters
listed
and labeled in accordance with UL 1482 and
				installed in accordance with the manufacturer's instructions.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.1 - Definition

Current through Register 1525, July 5, 2024
A masonry chimney is a chimney constructed of concrete or
				  masonry, hereinafter referred to as "masonry." Masonry chimneys shall be
				  constructed, anchored, supported and reinforced as required in this
				  chapter.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.2 - Footings and foundations

Current through Register 1525, July 5, 2024
Footings for masonry chimneys shall be constructed of
				  concrete or solid masonry at least 12 inches (305 mm) thick and shall extend at
				  least 6 inches (152 mm) beyond the face of the foundation or support wall on
				  all sides. Footings shall be founded on natural undisturbed earth or engineered
				  fill below frost depth. In areas not subjected to freezing, footings shall be
				  at least 12 inches (305 mm) below finished grade.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.3 - Seismic reinforcing

Current through Register 1525, July 5, 2024
Masonry or concrete chimneys shall be constructed, anchored,
				  supported and reinforced as required in this chapter. In
Seismic Design
				  Category
C or D, masonry and concrete chimneys shall be reinforced and
				  anchored as detailed in Sections 2113.3.1, 2113.3.2 and 2113.4. In
Seismic Design Category
A or B, reinforcement and seismic
				  anchorage is not required. In
Seismic Design Category
E or F,
				  masonry and concrete chimneys shall be reinforced in accordance with the
				  requirements of Sections 2101 through 2108.
2113.3.1
Vertical reinforcing.
For chimneys up to 40 inches (1016 mm) wide, four No. 4 continuous vertical
				bars anchored in the foundation shall be placed in the concrete between wythes
				of solid masonry or within the cells of hollow unit masonry and grouted in
				accordance with Section 2103.12. Grout shall be prevented from bonding with the
				flue liner so that the flue liner is free to move with thermal expansion. For
				chimneys greater than 40 inches (1016 mm) wide, two additional No. 4 vertical
				bars shall be provided for each additional 40 inches (1016 mm) in width or
				fraction thereof.
2113.3.2
Horizontal reinforcing.
Vertical reinforcement shall be placed enclosed
				within 1/4-inch (6.4 mm)
				ties, or other reinforcing of equivalent net cross-sectional area, spaced not
				to exceed 18 inches (457 mm) o.c. in concrete, or placed in the bed joints of
				unit masonry, at a minimum of every 18 inches (457 mm) of vertical height. Two
				such ties shall be provided at each bend in the vertical bars.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.4 - Seismic anchorage

Current through Register 1525, July 5, 2024
Masonry and concrete chimneys and foundations in
Seismic Design Category
C or D shall be anchored at each
				  floor, ceiling or roof line more than 6 feet (1829 mm) above grade, except
				  where constructed completely within the
exterior walls
.
				  Anchorage shall conform to the following requirements.
2113.4.1
Anchorage.
Two
				3/16-inch by 1-inch (4.8 mm
				by 25 mm) straps shall be embedded a minimum of 12 inches (305 mm) into the
				chimney. Straps shall be hooked around the outer bars and extend 6 inches (152
				mm) beyond the bend. Each strap shall be fastened to a minimum of four floor
				joists with two 1/2-inch
				(12.7 mm) bolts.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.5 - Corbeling

Current through Register 1525, July 5, 2024
Masonry chimneys shall not be corbeled more than half of the
				  chimney's wall thickness from a wall or foundation, nor shall a chimney be
				  corbeled from a wall or foundation that is less than 12 inches (305 mm) in
				  thickness unless it projects equally on each side of the wall, except that on
				  the second
story
of a two-story
dwelling
,
				  corbeling of chimneys on the exterior of the enclosing walls is permitted to
				  equal the wall thickness. The projection of a single course shall not exceed
				  one-half the unit height or one-third of the unit bed depth, whichever is
				  less.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.6 - Changes in dimension

Current through Register 1525, July 5, 2024
The chimney wall or chimney flue lining shall not change in
				  size or shape within 6 inches (152 mm) above or below where the chimney passes
				  through floor components, ceiling components or roof
				  components.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.7 - Offsets

Current through Register 1525, July 5, 2024
Where a masonry chimney is constructed with a fireclay flue
				  liner surrounded by one wythe of masonry, the maximum offset shall be such that
				  the centerline of the flue above the offset does not extend beyond the center
				  of the chimney wall below the offset. Where the chimney offset is supported by
				  masonry below the offset in an
approved
manner, the maximum
				  offset limitations shall not apply. Each individual corbeled masonry course of
				  the offset shall not exceed the projection limitations specified in Section
				  2113.5.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.8 - Additional load

Current through Register 1525, July 5, 2024
Chimneys shall not support loads other than their own weight
				  unless they are designed and constructed to support the additional load.
				  Masonry chimneys are permitted to be constructed as part of the masonry walls
				  or concrete walls of the building.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.9 - Termination

Current through Register 1525, July 5, 2024
Chimneys shall extend at least 2 feet (610 mm) higher than
				  any portion of the building within 10 feet (3048 mm), but shall not be less
				  than 3 feet (914 mm) above the highest point where the chimney passes through
				  the roof.
2113.9.1
Spark
				arrestors.
Where a spark arrestor is installed on a masonry chimney, the
				spark arrestor shall meet all of the following requirements:
1. The net free area of the arrestor shall
				not be less than four times the net free area of the outlet of the chimney flue
				it serves.
2. The arrestor screen
				shall have heat and corrosion resistance equivalent to 19-gage galvanized steel
				or 24-gage stainless steel.
3.
				Openings shall not permit the passage of spheres having a diameter greater than
				1/2 inch (12.7 mm) nor block
				the passage of spheres having a diameter less than
				3/8 inch (11 mm).
4. The spark arrestor shall be accessible for
				cleaning and the screen or chimney cap shall be removable to allow for cleaning
				of the chimney flue.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.10 - Wall thickness

Current through Register 1525, July 5, 2024
Masonry chimney walls shall be constructed of concrete,
				  solid masonry units or hollow masonry units grouted solid with not less than 4
				  inches (102 mm) nominal thickness.
2113.10.1
Masonry veneer
				chimneys.
Where masonry is used as veneer for a framed chimney, through
				flashing and weep holes shall be provided as required by Chapter 14.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.11 - Flue lining (material)

Current through Register 1525, July 5, 2024
Masonry chimneys shall be lined. The lining material shall
				  be appropriate for the type of appliance connected, according to the terms of
				  the appliance listing and the manufacturer's instructions.
2113.11.1
Residential-type appliances
				(general).
Flue lining systems shall comply with one of the following:
1. Clay flue lining complying with the
				requirements of ASTM C 315.
2.
Listed
chimney lining systems complying with UL
				1777.
3. Factory-built chimneys or
				chimney units
listed
for installation within masonry
				chimneys.
4. Other
approved
materials that will resist corrosion, erosion, softening or cracking
				from flue gases and condensate at temperatures up to 1,800°F
				(982°C).
2113.11.1.1
Flue linings for specific appliances.
Flue linings other than those
				covered in Section 2113.11.1 intended for use with specific appliances shall
				comply with Sections 2113.11.1.2 through 2113.11.1.4 and Sections 2113.11.2 and
				2113.11.3.
2113.11.1.2
Gas
				appliances.
Flue lining systems for gas appliances shall be in
				accordance with the
International Fuel Gas Code
.
2113.11.1.3
Pellet fuel-burning
				appliances.
Flue lining and vent systems for use in masonry chimneys
				with pellet fuel-burning appliances shall be limited to flue lining systems
				complying with Section 2113.11.1 and pellet vents
listed
for
				installation within masonry chimneys (see Section 2113.11.1.5 for
				marking).
2113.11.1.4
Oil-fired appliances approved for use with L-vent.
Flue lining and vent
				systems for use in masonry chimneys with oil-fired appliances
approved
for use with Type L vent shall be limited to flue
				lining systems complying with Section 2113.11.1 and
listed
chimney liners complying with UL 641 (see Section 2113.11.1.5 for
				marking).
2113.11.1.5
Notice
				of usage.
When a flue is relined with a material not complying with
				Section 2113.11.1, the chimney shall be plainly and permanently identified by a
label
attached to a wall, ceiling or other conspicuous
				location adjacent to where the connector enters the chimney. The
label
shall include the following message or equivalent
				language: "This chimney is for use only with (type or category of appliance)
				that burns (type of fuel). Do not connect other types of appliances."
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.12 - Clay flue lining (installation)

Current through Register 1525, July 5, 2024
Clay flue liners shall be installed in accordance with ASTM
				  C 1283 and extend from a point not less than 8 inches (203 mm) below the lowest
				  inlet or, in the case of fireplaces, from the top of the smoke chamber to a
				  point above the enclosing walls. The lining shall be carried up vertically,
				  with a maximum slope no greater than 30 degrees (0.52 rad) from the
				  vertical.
Clay flue liners shall be laid in medium-duty refractory
				  mortar conforming to ASTM C 199 with tight mortar joints left smooth on the
				  inside and installed to maintain an air space or insulation not to exceed the
				  thickness of the flue liner separating the flue liners from the interior face
				  of the chimney masonry walls. Flue lining shall be supported on all sides. Only
				  enough mortar shall be placed to make the joint and hold the liners in
				  position.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.13 - Additional requirements

Current through Register 1525, July 5, 2024
2113.13.1
Listed materials.
Listed
materials used as flue linings shall be installed in
				accordance with the terms of their listings and the manufacturer's
				instructions.
2113.13.2
Space
				around lining.
The space surrounding a chimney lining system or vent
				installed within a masonry chimney shall not be used to vent any other
				appliance.
Exception:
This shall not prevent the
				  installation of a separate flue lining in accordance with the manufacturer's
				  instructions.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.14 - Multiple flues

Current through Register 1525, July 5, 2024
When two or more flues are located in the same chimney,
				  masonry wythes shall be built between adjacent flue linings. The masonry wythes
				  shall be at least 4 inches (102 mm) thick and bonded into the walls of the
				  chimney.
Exception:
When venting only one appliance, two
				  flues are permitted to adjoin each other in the same chimney with only the flue
				  lining separation between them. The joints of the adjacent flue linings shall
				  be staggered at least 4 inches (102 mm).
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 21 - Masonry › Section 2113 - MASONRY CHIMNEYS › Subsection 2113.15 - Flue area (appliance)

Current through Register 1525, July 5, 2024
Chimney flues shall not be smaller in area than the area of
				  the connector from the appliance. Chimney flues connected to more than one
				  appliance shall not be less than the area of the largest connector plus 50
				  percent of the areas of additional chimney connectors.
Exceptions:
1. Chimney flues serving oil-fired appliances
				sized in accordance with NFPA 31.
2. Chimney flues serving gas-fired appliances
				sized in accordance with the
International Fuel Gas
				Code
.