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READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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[DIVISION 4: MASONRY]{.underline}

SECTION 04225 ‑ PREFACED CONCRETE UNIT MASONRY

USE: Furnishing and installing masonry wall sanitary facing.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[\_\_\_\_\_\] provide for information
to be inserted, as appropriate, to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface**,
and *italics*, within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately.)

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED.** Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name of the Project (upper and lower
case)**. Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specification that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST
110, or call (303) 987-6868.

**DRAWING DATA REQUIRED:**

**REQUIRED SPEC MODIFICATIONS:**

[GENERAL NOTES]{.underline}

A. Whenever entire articles, paragraphs, or subparagraphs are not
applicable, the articles, paragraphs, or subparagraphs should be
deleted; when necessary, reletter or renumber articles, paragraphs, or
subparagraphs.

B. THIS GUIDE IS NOT INTENDED AS A SUBSTITUTE FOR READING THE ENTIRE
SECTION.

[TECHNICAL NOTES]{.underline}

A. 1.1B: Select or add applicable specification sections. Do not list
sections from Division 4.

B. 1.2: Select or add applicable references.

C. 1.3A: Select applicable phrase.

D. 1.3B: Insert number of samples required. Normally 2 samples are
required. Distribution after review is normally 1 sample to the CO, and
1 sample to the Contractor.

E. 4.1 and 4.2: When a \"lump sum\" Contract is used, delete the title
PART 4: MEASUREMENT AND PAYMENT, and both articles from this
specification section. Measurement and payment will be addressed in Part
4 of Section 01010.

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes: 12/01

Metric:

Technical Update: 01/94

SECTION 04225

PREFACED CONCRETE UNIT MASONRY

[PART 1: GENERAL]{.underline}

1.1 SUMMARY

A. Section Includes: Furnishing and installing prefaced concrete masonry
units in white mortar where shown on the drawings.

1.2 SUBMITTALS

A. General: Submittals shall be according to \[Section 01009 - General
Information and Requirements.\] \[and\] \[Section 01330 ‑ Submittal
Procedures.\] \[and\] \[Section 01331 - Certificates.\]

B. Samples: Submit \[[ ]{.underline}\] samples of each color and pattern
of prefaced concrete masonry units to be used on this project. Samples
shall be actual material in colors required.

1.3 QUALITY ASSURANCE

A. Mock-Ups: Four-feet square for each type. Select blocks to fully show
variations in shade and color to be expected. Panel may be positioned as
part of a finished wall and, if approved, may be retained in the wall
structure. Approved panel will be the basis for approval or disapproval
of the remainder of wall surface using this material.

B. Failure Criteria: Not limited to the following:

1\. Cracks vertically or diagonally across the face of the masonry
through joints and masonry units.

2\. Mortar soft enough to be removed by rubbing with a finger.

3\. Damaged units which are evident from a point 5 feet from the wall
and 90 degrees to the wall opposite the unit in question.

1.4 DELIVERY, STORAGE, AND HANDLING

A. Storage: Stack and protect from weather by covering or storing inside
until placed in wall.

B. Handling: Prevent marring or damaging faces, edges and corners.

1.5 PROJECT AND SITE CONDITIONS

A. Environmental Conditions: Do not lay masonry in freezing weather
unless suitable means are provided to heat materials. Protect work from
cold and frost for 48 hours, such that mortar will harden without
freezing. No anti‑freeze ingredient shall be used.

B. Lighting: Do not work without proper lighting.

1.6 MAINTENANCE

A. Extra Materials: Contractor shall leave six-typical units \[,of each
color,\] in good condition, with the Contracting Officer for future use
as replacement units.

PART 2: PRODUCTS

2.1 MATERIALS

A. Prefaced Concrete Masonry Units

1\. Finish: Prefaced surface shall have smooth, satin‑gloss finish;
externally heat‑polymerized, cast‑on facing; no telegraphing of block
texture or color; according to ASTM C 744.

2\. Compressive Strength: Compressive strength of 1,000 psi over average
gross area according to ASTM C 90, Grade N‑1.

3\. Composition: Units shall be free from iron.

4\. Surface Burning Characteristics: Flame spread less than 25, fuel
contribution zero; smoke density less than 50.

5\. Color: Minimum 40 standard colors.

6\. Face: Units shall be plain faced.

7\. Glazed Face Sizes: Include 8 x 16 inches, 8 x 8 inches including
1/4-inch joints.

8\. Edges of glaze at joints shall consist of 1/16-inch thick lip
returned approximately 1/4 inch into joint at perimeter.

B. Mortar: Shall be Type S with a compressive strength of l,800 psi.

C. Vertical Reinforcing: Shall be \[40\] \[60\] grade reinforcing rod.

D. Horizontal Reinforcing: Shall be extra‑heavy truss type.

E. Water: Shall be clean and free from mineral or organic substances
which would affect the hardening or durability of the mortar. Potable
water is acceptable without testing.

F. Jointing Tools: Glass for concave joints.

G. Wiping Rags: Clean, cotton waste or equivalent.

H. Cleaning Compound: Masonry detergent cleaner. Do not use acid.

2.2 FABRICATION

A. Tolerances: Permissible variations in face dimensions and face
distortion [+]{.underline} 1/16 inch.

[PART 3: EXECUTION]{.underline}

3.1 EXAMINATION

A. Verification of Conditions: Ascertain that sufficient masonry units,
mortar materials and joint reinforcement shall be on site to permit
uninterrupted masonry erection. Necessary foundations, lintels, door
jambs, windows and any other miscellaneous built‑in items shall be on
site and accurately positioned. Verify that the concrete foundation has
cured sufficiently to support the load of the masonry above it.

B. Test Floor Surface: For straightness, levelness. Notify Contracting
Officer where grinding or trowelled filler corrections are needed.

C. Inspect Related Conditions: Do not start at any location until
adverse conditions at that location have been corrected.

3.2 PREPARATION

A. ab Aligning Base Course: Set base course to follow an accurate floor
line.

3.3 ERECTION

A. Workmanship: Align plumb, level, and true-to-line; uniform joint
widths carefully tooled; joints arranged neat and symmetrical; cut units
sized and located for best appearance; free of imperfections detracting
from overall appearance when viewed at 90 degrees from 5 feet.

B. Cutting: Shall be by saw and other power tools including chases,
holes and notches for pipes and switch boxes.

C. Jointing: Except where tuckpointing is required or noted, strike and
tool the setting mortar. Do not use smeared grout method to fill joints.

D. Tuckpointing: Rake out joints; tuckpoint with white mortar.

E. Metal Door Frames: Fill with grout. The first hollow masonry core
adjacent to the jamb shall be filled with grout and the specified
reinforcing bars installed as the wall is laid. See drawings.

F. Lateral Bracing: Incomplete walls or completed walls that are not
capable of self‑support shall be temporarily braced against wind
pressure.

G. Special Shapes: Bond beam blocks or other special shapes shall be
furnished and positioned where shown on the drawings.

H. Grouted Cells: Walls and cross webs forming grouted cells shall be
full‑bedded in mortar to prevent leakage of grout. Overhanging mortar
shall be removed from the insides of such cell walls.

I. Mortar Fill: Bed each block\'s rear face in a full bed of mortar to
the back‑up masonry wall.

J. Horizontal Reinforcing: Every 16 inches, additional reinforcing above
and below openings, at chases, and at other points where wall is
weakened.

K. Keep Glaze Clean: Use clean, soft, damp rags. Wipe off mortar smears
and spatters at once. Do not allow hardening.

L. Reinforcement

1\. General: Reinforcing bars shall be accurately placed in bond beams
and vertically in hollow masonry block cores.

2\. Vertical Reinforcing Rods: Lapped to the dowels cast or drilled into
the concrete foundation and masonry units threaded over them and lowered
into position. Rods shall be maximum length of 6 feet and shall lap a
minimum of 30 rod diameters, e.g., 1/2-inch rod = 15 inches. Rods shall
be supported in position at tops and bottoms and at intervals not
exceeding 192 rod diameters, e.g., 1/2-inch rod = 6 ft‑9 inches.

3\. Horizontal Joint Reinforcement: Installed concurrently with the
vertical reinforcement and threaded over these rods and installed as
specified under Section 04153 - Joint Reinforcement.

M. Masonry Units: Laid to preserve the unobstructed vertical continuity
of the cells to be filled with grout. Clear cells shall measure 2 x 3
inches minimum.

N. Grout: Cells containing reinforcement shall be filled solidly with
Type S grout.

1\. Maximum height of grout lifts shall be 8 feet.

2\. Consolidate grout at time of pouring by puddling or vibrating and
reconsolidate by again puddling later, before plasticity is lost.

3\. When total grout pour exceeds 8 feet in height, maximum grout pour
shall be in 4-foot lifts. Contracting Officer shall be present before
and during grouting.

4\. When grouting shall be stopped for over one hour, horizontal
construction joints shall be formed by stopping the pour of grout one
inch below the top of the uppermost unit grouted.

3.4 CLEANING

A. Masonry Cleaning: Masons shall clean their own work, as the walls are
laid up, using clean materials. Cleaning shall produce a uniform, clean
appearance of the entire wall surface. Any portion of wall varying in
appearance from that adjacent to it will be required to be cleaned until
uniformity is obtained, or the reason for the discrepancy ascertained
and accepted.

1\. Do not use a putty knife or other non‑resilient metal tool or
grinding stone on the surface of any wall.

B. Daily: As each day\'s unit masonry is completed, stiff fiber brush
the exposed face of the concrete masonry wall surface.

C. Second Day: Stiff fiber brush again using hot water.

D. Subsequent Cleaning: May use cold water and wire brush or
Contractor\'s method as approved by the Contracting Officer.

E. Adjacent Materials: Protect from contact with cleaning solution.

F. Completion: Rinse the entire wall area with water and scrub obvious
areas of color discrepancy or mortar deposits. Point up exposed masonry,
fill holes and joints; remove loose mortar, cut out defective joints and
repoint where necessary. Residue from this operation shall be removed
from the site.

[PART 4: MEASUREMENT AND PAYMENT]{.underline}

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WHEN A "LUMP SUM" CONTRACT IS USED, DELETE THE TITLE PART 4: MEASUREMENT
AND PAYMENT, AND BOTH ARTICLES FROM THIS SECTION. MEASUREMENT AND
PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01009 - GENERAL
INFORMATION AND REQUIREMENTS OR SECTION 01010 - SUMMARY OF WORK.

WHEN NOT A "LUMP SUM" CONTRACT, SELECT THE APPLICABLE PHRASES; USE THE
"NO MEASUREMENT" PHRASE WHEN THE PAY ITEM IN THIS SECTION IS NOT
INCLUDED IN THE BID SCHEDULE.

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

4.1 METHOD OF MEASUREMENT

A. Units: The work described in this section will \[not be measured for
payment.\] \[be measured and paid for on a lump sum basis.\]

4.2 BASIS OF PAYMENT

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

WHEN NOT A "LUMP SUM" CONTRACT, SELECT APPLICABLE PHRASES; USE THE "NO
DIRECT PAYMENT" PHRASE WHEN THE PAY ITEM IN THIS SECTION IS NOT INCLUDED
IN THE BID SCHEDULE.

WHEN NOT A "LUMP SUM" CONTRACT AND PAYMENT IS TO BE MADE UNDER THIS
SECTION, SELECT THE PAY ITEM. DO NOT CHANGE THE PAY TIME NUMBER.

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

A. Payment: \[No direct payment for the work described under this
section will be made. Consideration for this item shall be included in
the bid price for other items of the Contract.\] \[Prices and payment
will be full compensation for the work described in this section.
Payment will be made under:\]

[Pay Item]{.underline} [ Pay Unit]{.underline}

04225(01) Prefaced Concrete Unit Masonry Lump Sum

END OF SECTION