reglab/statecodes huggingface dataset:
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2502 - DEFINITIONS › Subsection 2502.1 - Definitions

Current through Register 1525, July 5, 2024
The following words and terms shall, for the purposes of
				  this chapter and as used elsewhere in this code, have the meanings shown
				  herein.
CEMENT PLASTER.
A mixture of portland or blended
				  cement, portland cement or blended cement and hydrated lime, masonry cement or
				  plastic cement and aggregate and other
approved
materials as
				  specified in this code.
EXTERIOR SURFACES.
Weather-exposed
				  surfaces.
GYPSUM BOARD.
Gypsum wallboard, gypsum
				  sheathing, gypsum base for gypsum veneer plaster, exterior gypsum soffit board,
				  predecorated gypsum board or water-resistant gypsum backing board complying
				  with the standards listed in Tables 2506.2, 2507.2 and Chapter 35.
GYPSUM PLASTER.
A mixture of calcined gypsum or
				  calcined gypsum and lime and aggregate and other
approved
materials as specified in this code.
GYPSUM VENEER PLASTER.
Gypsum plaster applied to
				  an
approved
base in one or more coats normally not exceeding
				  1/4 inch (6.4 mm) in total
				  thickness.
INTERIOR SURFACES.
Surfaces other than weather-
				  exposed surfaces.
WEATHER-EXPOSED SURFACES.
Surfaces of walls,
				  ceilings, floors, roofs, soffits and similar surfaces exposed to the weather
				  except the following:
1. Ceilings and
				roof soffits enclosed by walls, fascia, bulkheads or beams that extend a
				minimum of 12 inches (305 mm) below such ceiling or roof soffits.
2. Walls or portions of walls beneath an
				unenclosed roof area, where located a horizontal distance from an open exterior
				opening equal to at least twice the height of the opening.
3. Ceiling and roof soffits located a minimum
				horizontal distance of 10 feet (3048 mm) from the outer edges of the ceiling or
				roof soffits.
WIRE BACKING.
Horizontal strands of tautened
				  wire attached to surfaces of vertical supports which, when covered with the
				  building paper, provide a backing for cement plaster.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2503 - INSPECTION › Subsection 2503.1 - Inspection

Current through Register 1525, July 5, 2024
Lath and gypsum board shall be inspected in accordance with
				  Section 110.3.5.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2504 - VERTICAL AND HORIZONTAL ASSEMBLIES › Subsection 2504.1 - Scope

Current through Register 1525, July 5, 2024
The following requirements shall be met where construction
				  involves gypsum board, lath and plaster in vertical and horizontal
				  assemblies.
2504.1.1
Wood
				framing.
Wood supports for lath or gypsum board, as well as wood
				stripping or furring, shall not be less than 2 inches (51 mm) nominal thickness
				in the least dimension.
Exception:
The minimum nominal dimension of wood
				  furring strips installed over solid backing shall not be less than 1 inch by 2
				  inches (25 mm by 51 mm).
2504.1.2
Studless partitions.
The minimum thickness of vertically erected studless solid plaster partitions
				of 3/8-inch (9.5 mm) and
				3/4-inch (19.1 mm) rib metal
				lath or 1/2-inch-thick (12.7
				mm) long-length gypsum lath and gypsum board partitions shall be 2 inches (51
				mm).
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2505 - SHEAR WALL CONSTRUCTION › Subsection 2505.1 - Resistance to shear (wood framing)

Current through Register 1525, July 5, 2024
Wood-framed shear walls sheathed with gypsum board, lath and
				  plaster shall be designed and constructed in accordance with Section 2306.7 and
				  are permitted to resist wind and seismic loads. Walls resisting seismic loads
				  shall be subject to the limitations in Section 12.2.1 of ASCE
				  7.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2505 - SHEAR WALL CONSTRUCTION › Subsection 2505.2 - Resistance to shear (steel framing)

Current through Register 1525, July 5, 2024
Cold-formed steel-framed shear walls sheathed with gypsum
				  board and constructed in accordance with the materials and provisions of
				  Section 2210.6 are permitted to resist wind and seismic loads. Walls resisting
				  seismic loads shall be subject to the limitations in Section 12.2.1 of ASCE
				  7.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2506 - GYPSUM BOARD MATERIALS › Subsection 2506.1 - General

Current through Register 1525, July 5, 2024
Gypsum board materials and accessories shall be identified
				  by the manufacturer's designation to indicate compliance with the appropriate
				  standards referenced in this section and stored to protect such materials from
				  the weather.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2506 - GYPSUM BOARD MATERIALS › Subsection 2506.2 - Standards

Current through Register 1525, July 5, 2024
Gypsum board materials shall conform to the appropriate
				  standards listed in Table 2506.2 and Chapter 35 and, where required for fire
				  protection, shall conform to the provisions of Chapter 7.
TABLE 2506.2 GYPSUM BOARD MATERIALS AND
				  ACCESSORIES
MATERIAL
STANDARD
Accessories for gypsum board
ASTM C 1047
Adhesives for fastening gypsum wallboard
ASTM C 557
Elastomeric joint sealants
ASTM C 920
Exterior soffit board
ASTM C 931
Fiber-reinforced gypsum panels
ASTM C 1278
Glass mat gypsum backing panel
ASTM C 1178
Glass mat gypsum panel
ASTM C 1658
Glass mat gypsum substrate
ASTM C 1177
Gypsum backing board and gypsum shaftliner board
ASTM C 442
Gypsum ceiling board
ASTM C 1395
Gypsum sheathing
ASTM C 79
Gypsum wallboard
ASTM C 36
Joint reinforcing tape and compound
ASTM C 474; C 475
Nails for gypsum boards
ASTM C 514, F 547, F 1667
Predecorated gypsum board
ASTM C 960
Steel screws
ASTM C 954; C 1002
Steel studs, load-bearing
ASTM C 955
Steel studs, nonload-bearing
ASTM C 645
Standard specification for gypsum board
ASTM C 1396
Testing gypsum and gypsum products
ASTM C 22; C 472; C 473
Water-resistant gypsum backing board
ASTM C 630
2506.2.1
Other materials.
Metal suspension systems for acoustical and lay-in
				panel ceilings shall conform with ASTM C 635 listed in Chapter 35 and Section
				13.5.6 of ASCE 7 for installation in high seismic areas.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2507 - LATHING AND PLASTERING › Subsection 2507.1 - General

Current through Register 1525, July 5, 2024
Lathing and plastering materials and accessories shall be
				  marked by the manufacturer's designation to indicate compliance with the
				  appropriate standards referenced in this section and stored in such a manner to
				  protect them from the weather.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2507 - LATHING AND PLASTERING › Subsection 2507.2 - Standards

Current through Register 1525, July 5, 2024
Lathing and plastering materials shall conform to the
				  standards listed in Table 2507.2 and Chapter 35 and, where required for fire
				  protection, shall also conform to the provisions of Chapter 7.
TABLE 2507.2 LATH, PLASTERING MATERIALS AND
				  ACCESSORIES
MATERIAL
STANDARD
Accessories for gypsum veneer base
ASTM C 1047
Blended cement
ASTM C 595
Exterior plaster bonding compounds
ASTM C 932
Gypsum base for veneer plasters
ASTM C 588
Gypsum casting and molding plaster
ASTM C 59
Gypsum Keene's cement
ASTM C 61
Gypsum lath
ASTM C 37
Gypsum plaster
ASTM C 28
Gypsum veneer plaster
ASTM C 587
Interior bonding compounds, gypsum
ASTM C 631
Lime plasters
ASTM C 5; C 206
Masonry cement
ASTM C 91
Metal lath
ASTM C 847
Plaster aggregates
Sand
Perlite
Vermiculite
ASTM C 35; C 897
ASTM C 35
ASTM C 35
Plastic cement
ASTM C 1328
Portland cement
ASTM C 150
Steel screws
ASTM C 1002; C 954
Steel studs and track
ASTM C 645; C 955
Welded wire lath
ASTM C 933
Woven wire plaster base
ASTM C 1032
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2508 - GYPSUM CONSTRUCTION › Subsection 2508.1 - General

Current through Register 1525, July 5, 2024
Gypsum board and gypsum plaster construction shall be of the
				  materials listed in Tables 2506.2 and 2507.2. These materials shall be
				  assembled and installed in compliance with the appropriate standards listed in
				  Tables 2508.1 and 2511.1.1, and Chapter 35.
TABLE 2508.1 INSTALLATION OF GYPSUM
				  CONSTRUCTION
MATERIAL
STANDARD
Gypsum board
GA-216; ASTM C 840
Gypsum sheathing
ASTM C 1280
Gypsum veneer base
ASTM C 844
Interior lathing and furring
ASTM C 841
Steel framing for gypsum boards
ASTM C 754; C 1007
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2508 - GYPSUM CONSTRUCTION › Subsection 2508.2 - Limitations

Current through Register 1525, July 5, 2024
Gypsum wallboard or gypsum plaster shall not be used in any
				  exterior surface where such gypsum construction will be exposed directly to the
				  weather. Gypsum wallboard shall not be used where there will be direct exposure
				  to water or continuous high humidity conditions. Gypsum sheathing shall be
				  installed on exterior surfaces in accordance with ASTM C 1280.
2508.2.1
Weather protection.
Gypsum wallboard, gypsum lath or gypsum plaster shall not be installed until
				weather protection for the installation is provided.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2508 - GYPSUM CONSTRUCTION › Subsection 2508.3 - Single-ply application

Current through Register 1525, July 5, 2024
Edges and ends of gypsum board shall occur on the framing
				  members, except those edges and ends that are perpendicular to the framing
				  members. Edges and ends of gypsum board shall be in moderate contact except in
				  concealed spaces where fire-resistance-rated construction, shear resistance or
				  diaphragm action is not required.
2508.3.1
Floating angles.
Fasteners at the top and bottom plates of vertical assemblies, or the edges and
				ends of horizontal assemblies perpendicular to supports, and at the wall line
				are permitted to be omitted except on shear resisting elements or
				fire-resistance-rated assemblies. Fasteners shall be applied in such a manner
				as not to fracture the face paper with the fastener head.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2508 - GYPSUM CONSTRUCTION › Subsection 2508.4 - Joint treatment

Current through Register 1525, July 5, 2024
Gypsum board fire-resistance-rated assemblies shall have
				  joints and fasteners treated.
Exception:
Joint and fastener treatment need
				  not be provided where any of the following conditions occur:
1. Where the gypsum board is to receive a
				decorative finish such as wood paneling, battens, acoustical finishes or any
				similar application that would be equivalent to joint treatment.
2. On single-layer systems where joints occur
				over wood framing members.
3.
				Square edge or tongue-and-groove edge gypsum board (V-edge), gypsum backing
				board or gypsum sheathing.
4. On
				multilayer systems where the joints of adjacent layers are offset from one to
				another.
5. Assemblies tested
				without joint treatment.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2508 - GYPSUM CONSTRUCTION › Subsection 2508.5 - Horizontal gypsum board diaphragm ceilings

Current through Register 1525, July 5, 2024
Gypsum board shall be permitted to be used on wood joists to
				  create a horizontal diaphragm ceiling in accordance with Table 2508.5.
TABLE 2508.5 SHEAR CAPACITY FOR HORIZONTAL WOOD FRAMED
				  GYPSUM BOARD DIAPHRAGM CEILING ASSEMBLIES
MATERIAL
THICKNESS OF MATERIAL
(MINIMUM)
							 (inches)
SPACING OF FRAMING MEMBERS
(MAXIMUM) (inches)
SHEAR VALUEa,
							 b
(plf of ceiling)
MIMIMUM FASTENER SIZE
Gypsum board
1/2
16 o.c.
90
5d cooler or wallboard nail; 15/8-inch long; 0.086-inch
							 shank;15/64inch headc
Gypsum board
1/2
24 o.c.
70
5d cooler or wallboard nail; 15/8-inch long; 0.086-inch
							 shank;15/64inch headc
For SI: 1 inch = 25.4 mm, 1 pound per linear foot =
							 14.59 N/m.
a. Values are not cumulative with other horizontal
							 diaphragm values and are for short-term loading due to wind or seismic loading.
							 Values shall be reduced 25 percent for normal loading.
b. Values
							 shall be reduced 50 percent in Seismic Design Categories D, E and F.
c. 11/4-inch, No. 6 Type S or W screws are permitted to be
							 substituted for the listed nails.
2508.5.1
Diaphragm proportions.
The maximum allowable diaphragm proportions shall
				be 11/2:1 between shear
				resisting elements. Rotation or cantilever conditions shall not be
				permitted.
2508.5.2
Installation.
Gypsum board used in a horizontal diaphragm ceiling shall
				be installed perpendicular to ceiling framing members. End joints of adjacent
				courses of gypsum board shall not occur on the same joist.
2508.5.3
Blocking of perimeter
				edges.
All perimeter edges shall be blocked using a wood member not less
				than 2-inch by 6-inch (51 mm by 159 mm) nominal dimension. Blocking material
				shall be installed flat over the top plate of the wall to provide a nailing
				surface not less than 2 inches (51 mm) in width for the attachment of the
				gypsum board.
2508.5.4
Fasteners.
Fasteners used for the attachment of gypsum board to a
				horizontal diaphragm ceiling shall be as defined in Table 2508.5. Fasteners
				shall be spaced not more than 7 inches (178 mm) on center (o.c.) at all
				supports, including perimeter blocking, and not more than
				3/8 inch (9.5 mm) from the
				edges and ends of the gypsum board.
2508.5.5
Lateral force
				restrictions.
Gypsum board shall not be used in diaphragm ceilings to
				resist lateral forces imposed by masonry or concrete construction.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2509 - GYPSUM BOARD IN SHOWERS AND WATER CLOSETS › Subsection 2509.1 - Wet areas

Current through Register 1525, July 5, 2024
Showers and public toilet walls shall conform to Sections
				  1210.2 and 1210.3.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2509 - GYPSUM BOARD IN SHOWERS AND WATER CLOSETS › Subsection 2509.2 - Base for tile

Current through Register 1525, July 5, 2024
Glass mat water-resistant gypsum backing panels, discrete
				  nonasbestos fiber-cement interior substrate sheets or nonasbestos fiber-mat
				  reinforced cement substrate sheets in compliance with ASTM C 1178, C 1288 or C
				  1325 and installed in accordance with manufacturer recommendations shall be
				  used as a base for wall tile in tub and shower areas and wall and ceiling
				  panels in shower areas. Water-resistant gypsum backing board shall be used as a
				  base for tile in water closet compartment walls when installed in accordance
				  with GA-216 or ASTM C 840 and manufacturer recommendations. Regular gypsum
				  wallboard is permitted under tile or wall panels in other wall and ceiling
				  areas when installed in accordance with GA-216 or ASTM C 840.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2509 - GYPSUM BOARD IN SHOWERS AND WATER CLOSETS › Subsection 2509.3 - Limitations

Current through Register 1525, July 5, 2024
Water-resistant gypsum backing board shall not be used in
				  the following locations:
1. Over a
				vapor retarder in shower or bathtub compartments.
2. Where there will be direct exposure to
				water or in areas subject to continuous high humidity.
3. On ceilings where frame spacing exceeds 12
				inches (305 mm) o.c. for
				1/2-inch-thick (12.7 mm)
				water-resistant gypsum backing board and more than 16 inches (406 mm) o.c. for
				5/8-inch-thick (15.9 mm)
				water-resistant gypsum backing board.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2510 - LATHING AND FURRING FOR CEMENT PLASTER (STUCCO) › Subsection 2510.1 - General

Current through Register 1525, July 5, 2024
Exterior and interior cement plaster and lathing shall be
				  done with the appropriate materials listed in Table 2507.2 and Chapter
				  35.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2510 - LATHING AND FURRING FOR CEMENT PLASTER (STUCCO) › Subsection 2510.2 - Weather protection

Current through Register 1525, July 5, 2024
Materials shall be stored in such a manner as to protect
				  such materials from the weather.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2510 - LATHING AND FURRING FOR CEMENT PLASTER (STUCCO) › Subsection 2510.3 - Installation

Current through Register 1525, July 5, 2024
Installation of these materials shall be in compliance with
				  ASTM C 926 and ASTM C 1063.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2510 - LATHING AND FURRING FOR CEMENT PLASTER (STUCCO) › Subsection 2510.4 - Corrosion resistance

Current through Register 1525, July 5, 2024
Metal lath and lath attachments shall be of
				  corrosion-resistant material.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2510 - LATHING AND FURRING FOR CEMENT PLASTER (STUCCO) › Subsection 2510.5 - Backing

Current through Register 1525, July 5, 2024
Backing or a lath shall provide sufficient rigidity to
				  permit plaster applications.
2510.5.1
Support of lath.
Where lath on vertical surfaces extends between
				rafters or other similar projecting members, solid backing shall be installed
				to provide support for lath and attachments.
2510.5.2
Use of gypsum backing
				board.
2510.5.2.1
Use of gypsum
				board as a backing board.
Gypsum lath or gypsum wallboard shall not be
				used as a backing for cement plaster.
Exception:
Gypsum lath or gypsum wallboard is
				  permitted, with a
water-resistive barrier
, as a backing for
				  self-furred metal lath or self-furred wire fabric lath and cement plaster where
				  either of the following conditions occur:
1. On horizontal supports of ceilings or roof
				soffits.
2. On interior
				walls.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2510 - LATHING AND FURRING FOR CEMENT PLASTER (STUCCO) › Subsection 2510.6 - Water-resistive barriers

Current through Register 1525, July 5, 2024
Water-resistive barrier
s shall be installed
				  as required in Section 1404.2 and, where applied over wood-based sheathing,
				  shall include a water-resistive vapor-permeable barrier with a performance at
				  least equivalent to two layers of Grade D paper.
Exception:
Where the
water-resistive
				  barrier
that is applied over wood-based sheathing has a water
				  resistance equal to or greater than that of 60-minute Grade D paper and is
				  separated from the stucco by an intervening, substantially nonwater-absorbing
				  layer or drainage space.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2510 - LATHING AND FURRING FOR CEMENT PLASTER (STUCCO) › Subsection 2510.7 - Preparation of masonry and concrete

Current through Register 1525, July 5, 2024
Surfaces shall be clean, free from efflorescence,
				  sufficiently damp and rough for proper bond. If the surface is insufficiently
				  rough,
approved
bonding agents or a portland cement dash bond
				  coat mixed in proportions of not more than two parts volume of sand to one part
				  volume of portland cement or plastic cement shall be applied. The dash bond
				  coat shall be left undisturbed and shall be moist cured not less than 24
				  hours.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2511 - INTERIOR PLASTER › Subsection 2511.1 - General

Current through Register 1525, July 5, 2024
Plastering gypsum plaster or cement plaster shall not be
				  less than three coats where applied over metal lath or wire fabric lath and not
				  less than two coats where applied over other bases permitted by this
				  chapter.
Exception:
Gypsum veneer plaster and cement
				  plaster specifically designed and
approved
for one-coat
				  applications.
2511.1.1
Installation.
Installation of lathing and plaster materials shall
				conform with Table 2511.1.1 and Section 2507.
TABLE 2511.1.1 INSTALLATION OF PLASTER
				  CONSTRUCTION
MATERIAL
STANDARD
Cement plaster
ASTM C 926
Gypsum plaster
ASTM C 842
Gypsum veneer plaster
ASTM C 843
Interior lathing and furring (gypsum plaster)
ASTM C 841
Lathing and furring (cement plaster)
ASTM C 1063
Steel framing
ASTM C 754; C 1007
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2511 - INTERIOR PLASTER › Subsection 2511.2 - Limitations

Current through Register 1525, July 5, 2024
Plaster shall not be applied directly to fiber insulation
				  board. Cement plaster shall not be applied directly to gypsum lath or gypsum
				  plaster except as specified in Sections 2510.5.1 and
				  2510.5.2.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2511 - INTERIOR PLASTER › Subsection 2511.3 - Grounds

Current through Register 1525, July 5, 2024
Where installed, grounds shall ensure the minimum thickness
				  of plaster as set forth in ASTM C 842 and ASTM C 926. Plaster thickness shall
				  be measured from the face of lath and other bases.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2511 - INTERIOR PLASTER › Subsection 2511.4 - Interior masonry or concrete

Current through Register 1525, July 5, 2024
Condition of surfaces shall be as specified in Section
				  2510.7.
Approved
specially prepared gypsum plaster designed
				  for application to concrete surfaces or
approved
acoustical
				  plaster is permitted. The total thickness of base coat plaster applied to
				  concrete ceilings shall be as set forth in ASTM C 842 or ASTM C 926. Should
				  ceiling surfaces require more than the maximum thickness permitted in ASTM C
				  842 or ASTM C 926, metal lath or wire fabric lath shall be installed on such
				  surfaces before plastering.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2511 - INTERIOR PLASTER › Subsection 2511.5 - Wet areas

Current through Register 1525, July 5, 2024
Showers and public toilet walls shall conform to Sections
				  1210.2 and 1210.3. When wood frame walls and partitions are covered on the
				  interior with cement plaster or tile of similar material and are subject to
				  water splash, the framing shall be protected with an
approved
moisture barrier.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2512 - EXTERIOR PLASTER › Subsection 2512.1 - General

Current through Register 1525, July 5, 2024
Plastering with cement plaster shall be not less than three
				  coats when applied over metal lath or wire fabric lath or gypsum board backing
				  as specified in Section 2510.5 and shall be not less than two coats when
				  applied over masonry or concrete. If the plaster surface is to be completely
				  covered by veneer or other facing material, or is completely concealed by
				  another wall, plaster application need only be two coats, provided the total
				  thickness is as set forth in ASTM C 926.
2512.1.1
On-grade floor slab.
On
				wood framed or steel stud construction with an on-grade concrete floor slab
				system, exterior plaster shall be applied in such a manner as to cover, but not
				to extend below, the lath and paper. The application of lath, paper and
				flashing or drip screeds shall comply with ASTM C 1063.
2512.1.2
Weep screeds.
A minimum
				0.019-inch (0.48 mm) (No. 26 galvanized sheet gage), corrosion-resistant weep
				screed with a minimum vertical attachment flange of
				31/2 inches (89 mm) shall be
				provided at or below the foundation plate line on exterior stud walls in
				accordance with ASTM C 926. The weep screed shall be placed a minimum of 4
				inches (102 mm) above the earth or 2 inches (51 mm) above paved areas and be of
				a type that will allow trapped water to drain to the exterior of the building.
				The
water-resistive barrier
shall lap the attachment flange.
				The exterior lath shall cover and terminate on the attachment flange of the
				weep screed.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2512 - EXTERIOR PLASTER › Subsection 2512.2 - Plasticity agents

Current through Register 1525, July 5, 2024
Only
approved
plasticity agents and
approved
amounts thereof shall be added to portland cement or
				  blended cements. When plastic cement or masonry cement is used, no additional
				  lime or plasticizers shall be added. Hydrated lime or the equivalent amount of
				  lime putty used as a plasticizer is permitted to be added to cement plaster or
				  cement and lime plaster in an amount not to exceed that set forth in ASTM C
				  926.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2512 - EXTERIOR PLASTER › Subsection 2512.4 - Cement plaster

Current through Register 1525, July 5, 2024
Plaster coats shall be protected from freezing for a period
				  of not less than 24 hours after set has occurred. Plaster shall be applied when
				  the ambient temperature is higher than 40°F (4°C), unless provisions
				  are made to keep cement plaster work above 40°F (4°C) during
				  application and 48 hours thereafter.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2512 - EXTERIOR PLASTER › Subsection 2512.5 - Second-coat application

Current through Register 1525, July 5, 2024
The second coat shall be brought out to proper thickness,
				  rodded and floated sufficiently rough to provide adequate bond for the finish
				  coat. The second coat shall have no variation greater than
				  1/4 inch (6.4 mm) in any
				  direction under a 5-foot (1524 mm) straight edge.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2512 - EXTERIOR PLASTER › Subsection 2512.6 - Curing and interval

Current through Register 1525, July 5, 2024
First and second coats of cement plaster shall be applied and
				  moist cured as set forth in ASTM C 926 and Table 2512.6.
TABLE 2512.6 CEMENT
				  PLASTERSa
COAT
MINIMUM PERIOD MOIST CURING
MINIMUM INTERVAL BETWEEN COATS
First
48 hoursa
48 hoursb
Second
48 hours
7 daysc
Finish
-
Note c
a. The first two coats shall be as required for the
							 first coats of exterior plaster, except that the moist-curing time period
							 between the first and second coats shall not be less than 24 hours. Moist
							 curing shall not be required where job and weather conditions are favorable to
							 the retention of moisture in the cement plaster for the required time period.
b. Twenty-four-hour minimum interval between coats of interior
							 cement plaster. For alternate method of application, see Section 2512.8.
c. Finish coat plaster is permitted to be applied to interior
							 cement plaster base coats after a 48-hour period.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2512 - EXTERIOR PLASTER › Subsection 2512.7 - Application to solid backings

Current through Register 1525, July 5, 2024
Where applied over gypsum backing as specified in Section
				  2510.5 or directly to unit masonry surfaces, the second coat is permitted to be
				  applied as soon as the first coat has attained sufficient
				  hardness.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2512 - EXTERIOR PLASTER › Subsection 2512.8 - Alternate method of application

Current through Register 1525, July 5, 2024
The second coat is permitted to be applied as soon as the
				  first coat has attained sufficiently rigidity to receive the second
				  coat.
2512.8.1
Admixtures.
When using this method of application, calcium aluminate
				cement up to 15 percent of the weight of the portland cement is permitted to be
				added to the mix.
2512.8.2
Curing.
Curing of the first coat is permitted to be omitted and the
				second coat shall be cured as set forth in ASTM C 926 and Table
				2512.6.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2512 - EXTERIOR PLASTER › Subsection 2512.9 - Finish coats

Current through Register 1525, July 5, 2024
Cement plaster finish coats shall be applied over base coats
				  that have been in place for the time periods set forth in ASTM C 926. The third
				  or finish coat shall be applied with sufficient material and pressure to bond
				  and to cover the brown coat and shall be of sufficient thickness to conceal the
				  brown coat.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2513 - EXPOSED AGGREGATE PLASTER › Subsection 2513.1 - General

Current through Register 1525, July 5, 2024
Exposed natural or integrally colored aggregate is permitted
				  to be partially embedded in a natural or colored bedding coat of cement plaster
				  or gypsum plaster, subject to the provisions of this section.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2513 - EXPOSED AGGREGATE PLASTER › Subsection 2513.2 - Aggregate

Current through Register 1525, July 5, 2024
The aggregate shall be applied manually or mechanically and
				  shall consist of marble chips, pebbles or similar durable, moderately hard
				  (three or more on the Mohs hardness scale), nonreactive
				  materials.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2513 - EXPOSED AGGREGATE PLASTER › Subsection 2513.3 - Bedding coat proportions

Current through Register 1525, July 5, 2024
The bedding coat for interior or exterior surfaces shall be
				  composed of one part portland cement and one part Type S lime; or one part
				  blended cement and one part Type S lime; or masonry cement; or plastic cement,
				  and a maximum of three parts of graded white or natural sand by volume. The
				  bedding coat for interior surfaces shall be composed of 100 pounds (45.4 kg) of
				  neat gypsum plaster and a maximum of 200 pounds (90.8 kg) of graded white sand.
				  A factory-prepared bedding coat for interior or exterior use is permitted. The
				  bedding coat for exterior surfaces shall have a minimum compressive strength of
				  1,000 pounds per square inch (psi) (6895 kPa).
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2513 - EXPOSED AGGREGATE PLASTER › Subsection 2513.4 - Application

Current through Register 1525, July 5, 2024
The bedding coat is permitted to be applied directly over
				  the first (scratch) coat of plaster, provided the ultimate overall thickness is
				  a minimum of 7/8 inch (22
				  mm), including lath. Over concrete or masonry surfaces, the overall thickness
				  shall be a minimum of 1/2
				  inch (12.7 mm).
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2513 - EXPOSED AGGREGATE PLASTER › Subsection 2513.5 - Bases

Current through Register 1525, July 5, 2024
Exposed aggregate plaster is permitted to be applied over
				  concrete, masonry, cement plaster base coats or gypsum plaster base coats
				  installed in accordance with Section 2511 or 2512.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2513 - EXPOSED AGGREGATE PLASTER › Subsection 2513.6 - Preparation of masonry and concrete

Current through Register 1525, July 5, 2024
Masonry and concrete surfaces shall be prepared in
				  accordance with the provisions of Section 2510.7.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 25 - Gypsum Board and Plaster › Section 2513 - EXPOSED AGGREGATE PLASTER › Subsection 2513.7 - Curing of base coats

Current through Register 1525, July 5, 2024
Cement plaster base coats shall be cured in accordance with
				  ASTM C 926. Cement plaster bedding coats shall retain sufficient moisture for
				  hydration (hardening) for 24 hours minimum or, where necessary, shall be kept
				  damp for 24 hours by light water spraying.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2601 - GENERAL › Subsection 2601.1 - Scope

Current through Register 1525, July 5, 2024
These provisions shall govern the materials, design,
				  application, construction and installation of foam plastic, foam plastic
				  insulation, plastic veneer, interior plastic finish and
trim
and light-transmitting plastics. See Chapter 14 for requirements for
exterior wall
finish and
trim
.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2602 - DEFINITIONS › Subsection 2602.1 - General

Current through Register 1525, July 5, 2024
The following words and terms shall, for the purposes of
				  this chapter and as used elsewhere in this code, have the meanings shown
				  herein.
FIBER REINFORCED POLYMER.
A polymeric composite
				  material consisting of reinforcement fibers impregnated with a fiber-binding
				  polymer which is then molded and hardened.
FIBERGLASS REINFORCED POLYMER.
A polymeric
				  composite material consisting of glass reinforcement fibers impregnated with a
				  fiber-binding polymer which is then molded and hardened.
FOAM PLASTIC INSULATION.
A plastic that is
				  intentionally expanded by the use of a foaming agent to produce a
				  reduced-density plastic containing voids consisting of open or closed cells
				  distributed throughout the plastic for thermal insulating or acoustical
				  purposes and that has a density less than 20 pounds per cubic foot (pcf) (320
				  kg/m3).
LIGHT-DIFFUSING SYSTEM.
Construction consisting
				  in whole or in part of lenses, panels, grids or baffles made with
				  light-transmitting plastics positioned below independently mounted electrical
				  light sources, skylights or light-transmitting plastic roof panels. Lenses,
				  panels, grids and baffles that are part of an electrical fixture shall not be
				  considered as a light-diffusing system.
LIGHT-TRANSMITTING PLASTIC ROOF PANELS.
Structural plastic panels other than skylights that are fastened to structural
				  members, or panels or sheathing and that are used as light-transmitting media
				  in the plane of the roof.
LIGHT-TRANSMITTING PLASTIC WALL PANELS.
Plastic
				  materials that are fastened to structural members, or to structural panels or
				  sheathing, and that are used as light-transmitting media in
exterior
				  walls
.
PLASTIC, APPROVED.
Any thermoplastic,
				  thermosetting or reinforced thermosetting plastic material that conforms to
				  combustibility classifications specified in the section applicable to the
				  application and plastic type.
PLASTIC GLAZING.
Plastic materials that are
				  glazed or set in frame or sash and not held by mechanical fasteners that pass
				  through the glazing material.
THERMOPLASTIC MATERIAL.
A plastic material that
				  is capable of being repeatedly softened by increase of temperature and hardened
				  by decrease of temperature.
THERMOSETTING MATERIAL.
A plastic material that
				  is capable of being changed into a substantially nonreformable product when
				  cured.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2603 - FOAM PLASTIC INSULATION › Subsection 2603.2 - Labeling and identification

Current through Register 1525, July 5, 2024
Packages and containers of foam plastic insulation and foam
				  plastic insulation components delivered to the job site shall bear the
label
of an
approved agency
showing the
				  manufacturer's name, product listing, product identification and information
				  sufficient to determine that the end use will comply with the code
				  requirements.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2603 - FOAM PLASTIC INSULATION › Subsection 2603.3 - Surface-burning characteristics

Current through Register 1525, July 5, 2024
Unless otherwise indicated in this section, foam plastic
				  insulation and foam plastic cores of manufactured assemblies shall have a flame
				  spread index of not more than 75 and a smoke-developed index of not more than
				  450 where tested in the maximum thickness intended for use in accordance with
				  ASTM E 84 or UL 723. Loose fill-type foam plastic insulation shall be tested as
				  board stock for the flame spread and smoke-developed indexes.
Exceptions:
1. Smoke-developed index for interior
trim
as provided for in Section 2604.2.
2. In cold storage buildings, ice plants,
				food plants, food processing rooms and similar areas, foam plastic insulation
				where tested in a thickness of 4 inches (102 mm) shall be permitted in a
				thickness up to 10 inches (254 mm) where the building is equipped throughout
				with an automatic fire sprinkler system in accordance with Section 903.3.1.1.
				The approved
automatic sprinkler system
shall be provided in
				both the room and that part of the building in which the room is
				located.
3. Foam plastic insulation
				that is a part of a Class A, B or C roof-covering assembly provided the
				assembly with the foam plastic insulation satisfactorily passes FM 4450 or UL
				1256. The smoke-developed index shall not be limited for roof
				applications.
4. Foam plastic
				insulation greater than 4 inches (102 mm) in thickness shall have a maximum
				flame spread index of 75 and a smoke-developed index of 450 where tested at a
				minimum thickness of 4 inches (102 mm), provided the end use is approved in
				accordance with Section 2603.9 using the thickness and density intended for
				use.
5. Flame spread and
				smoke-developed indexes for foam plastic interior signs in
covered mall
				buildings
provided the signs comply with Section 402.15.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2603 - FOAM PLASTIC INSULATION › Subsection 2603.6 - Roofing

Current through Register 1525, July 5, 2024
Foam plastic insulation meeting the requirements of Sections
				  2603.2, 2603.3 and 2603.4 shall be permitted as part of a roof-covering
				  assembly, provided the assembly with the foam plastic insulation is a Class A,
				  B or C roofing assembly where tested in accordance with ASTM E 108 or UL
				  790.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2603 - FOAM PLASTIC INSULATION › Subsection 2603.7 - Plenums

Current through Register 1525, July 5, 2024
Foam plastic insulation shall not be used as interior wall
				  or ceiling finish in plenums except as permitted in Section 2604 or when
				  protected by a thermal barrier in accordance with Section
				  2603.4.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2603 - FOAM PLASTIC INSULATION › Subsection 2603.8 - Protection against termites

Current through Register 1525, July 5, 2024
In areas where the probability of termite infestation is
				  very heavy in accordance with Figure 2603.8, extruded and expanded polystyrene,
				  polyisocyanurate and other foam plastics shall not be installed on the exterior
				  face or under interior or exterior foundation walls or slab foundations located
				  below grade. The clearance between foam plastics installed above grade and
				  exposed earth shall be at least 6 inches (152 mm).
Exceptions:
1. Buildings where the structural members of
				walls, floors, ceilings and roofs are entirely of noncombustible materials or
				preservative-treated wood.
2. An
				approved method of protecting the foam plastic and structure from subterranean
				termite damage is provided.
3. On
				the interior side of basement walls.
Click to view
							 image
FIGURE 2603.8
TERMITE INFESTATION
				  PROBABILITY MAP
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2603 - FOAM PLASTIC INSULATION › Subsection 2603.9 - Special approval

Current through Register 1525, July 5, 2024
Foam plastic shall not be required to comply with the
				  requirements of Sections 2603.4 through 2603.7 where specifically approved
				  based on large-scale tests such as, but not limited to, NFPA 286 (with the
				  acceptance criteria of Section 803.1.2.1), FM 4880, UL 1040 or UL 1715. Such
				  testing shall be related to the actual end-use configuration and be performed
				  on the finished manufactured foam plastic assembly in the maximum thickness
				  intended for use. Foam plastics that are used as interior finish on the basis
				  of special tests shall also conform to the flame spread requirements of Chapter
				  8. Assemblies tested shall include seams, joints and other typical details used
				  in the installation of the assembly and shall be tested in the manner intended
				  for use.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2604 - INTERIOR FINISH AND TRIM › Subsection 2604.1 - General

Current through Register 1525, July 5, 2024
Plastic materials installed as interior finish or
trim
shall comply with Chapter 8. Foam plastics shall only be
				  installed as interior finish where approved in accordance with the special
				  provisions of Section 2603.9. Foam plastics that are used as interior finish
				  shall also meet the flame spread index requirements for interior finish in
				  accordance with Chapter 8. Foam plastics installed as interior
trim
shall comply with Section 2604.2.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2604 - INTERIOR FINISH AND TRIM › Subsection 2604.2 - Interior trim

Current through Register 1525, July 5, 2024
Foam plastic used as interior
trim
shall
				  comply with Sections 2604.2.1 through 2604.2.4. [F]
2604.2.1
Density.
The minimum
				density of the interior
trim
shall be 20 pcf (320
				kg/m3). [F]
2604.2.2
Thickness.
The maximum
				thickness of the interior
trim
shall be
				1/2 inch (12.7 mm) and the
				maximum width shall be 8 inches (204 mm). [F]
2604.2.3
Area limitation.
The
				interior
trim
shall not constitute more than 10 percent of the
				specific wall or ceiling areas to which it is attached. [F]
2604.2.4
Flame spread.
The flame
				spread index shall not exceed 75 where tested in accordance with ASTM E 84 or
				UL 723. The smoke-developed index shall not be limited. [F]
Exception:
When the interior
trim
material has been tested as an interior finish in
				  accordance with NFPA 286 and complies with the acceptance criteria in Section
				  803.1.2.1, it shall not be required to be tested for flame spread index in
				  accordance with ASTM E 84 or UL 723.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2605 - PLASTIC VENEER › Subsection 2605.2 - Exterior use

Current through Register 1525, July 5, 2024
Exterior plastic veneer, other than plastic siding, shall be
				  permitted to be installed on the
exterior walls
of buildings
				  of any type of construction in accordance with all of the following
				  requirements:
1. Plastic veneer shall
				comply with Section 2606.4.
2.
				Plastic veneer shall not be attached to any exterior wall to a height greater
				than 50 feet (15 240 mm) above grade.
3. Sections of plastic veneer shall not
				exceed 300 square feet (27.9 m2) in area and shall
				be separated by a minimum of 4 feet (1219 mm) vertically.
Exception:
The area and separation requirements
				  and the smoke-density limitation are not applicable to plastic veneer applied
				  to buildings constructed of Type VB construction, provided the walls are not
				  required to have a fire-resistance rating.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2606 - LIGHT-TRANSMITTING PLASTICS › Subsection 2606.1 - General

Current through Register 1525, July 5, 2024
The provisions of this section and Sections 2607 through
				  2611 shall govern the quality and methods of application of light-transmitting
				  plastics for use as light-transmitting materials in buildings and structures.
				  Foam plastics shall comply with Section 2603. Light-transmitting plastic
				  materials that meet the other code requirements for walls and roofs shall be
				  permitted to be used in accordance with the other applicable chapters of the
				  code.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2606 - LIGHT-TRANSMITTING PLASTICS › Subsection 2606.2 - Approval for use

Current through Register 1525, July 5, 2024
Sufficient technical data shall be submitted to substantiate
				  the proposed use of any light-transmitting material, as approved by the
building official
and subject to the requirements of this
				  section.
Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 26 - Plastic › Section 2606 - LIGHT-TRANSMITTING PLASTICS › Subsection 2606.3 - Identification

Current through Register 1525, July 5, 2024
Each unit or package of light-transmitting plastic shall be
				  identified with a
mark
or decal satisfactory to the
building official
, which includes identification as to the
				  material classification.