2015_Fence_IDIQ_Section_04810.doc

CONSTRUCT / REPAIR FENCE IDIQ

IFB No.:

Contract No.: FA4861-

Copyright 1998, The American Institute of Architects (AIA)

SECTION 04810 - UNIT MASONRY ASSEMBLIES

This Section uses the term "Architect." Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions.

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 1 - GENERAL

1. List Level 1

1.1 SUMMARY

A. This Section includes unit masonry assemblies consisting of the following:

Edit list below to suit Project.

1. Concrete masonry units.

2. Mortar and grout.

3. Reinforcing steel.

4. Ties and anchors.

5. Miscellaneous masonry accessories.

B. Products installed, but not furnished, under this Section include the following:

Subparagraphs below are examples only. Revise to suit Project.

1. Manufactured reglets in masonry joints for metal flashing, furnished under Division 7 Section “Sheet Metal Flashing and Trim.”

2. Hollow-metal frames in unit masonry openings, furnished under Division 8 Section “Steel Doors and Frames.”

Retain paragraph below if allowances are specified for brick selection or for masonry testing. Include separate brick allowances for special shapes if required.

1.2 DEFINITIONS

A. Reinforced Masonry: Masonry containing reinforcing steel in grouted cells.

1.3 PERFORMANCE REQUIREMENTS

Retain this Article only for engineered masonry and where required by code. Delete for veneer and masonry designed by the empirical method. This Article may also be deleted for engineered masonry if compressive strength of units is specified. See Editing Instruction No. 2 in the Evaluations.

A. Provide unit masonry that develops the following net-area compressive strengths (f’m) at 28 days. Determine compressive strength of masonry from net-area compressive strengths of masonry units and mortar types according to Table 21-D of the Uniform Building Code.

Select paragraph above or below. If retaining above, correlate unit masonry and mortar requirements in Part 2 with compressive strengths selected.

B. Provide unit masonry that develops the following net-area compressive strengths (f’m) at 28 days. Determine compressive strength of masonry by testing masonry prisms according to UBC Standard 21-17.

Retain appropriate subparagraphs below with either paragraph above. Retain or revise values in subparagraphs if one value is applicable throughout Project. Retain "as indicated" if values are shown on Drawings.

1. For Concrete Unit Masonry: f’m = 1500 psi (10.3 MPa).

1.4 SUBMITTALS

A. Comply with AF Form 66, “Submittals and Substitutions.”

Delete subparagraph below if stone trim is not used.

Delete paragraph and subparagraphs above if colors and textures are preselected and specified or scheduled. Retain paragraph and subparagraphs below with or without above.

B. Samples for Verification: For the following:

Revise or expand subparagraphs below to suit Project.

1. Full-size units for each different exposed masonry unit required, showing the full range of exposed colors, textures and dimensions to be expected in the completed construction.

Delete subparagraph below if colored mortar is not used.

Retain paragraph and subparagraph below for critical work where record of mockup materials is desired.

See Editing Instruction No. 3 in the Evaluations for information on material test reports.

C. Material Test Reports: From a qualified testing agency indicating and interpreting test results of the following for compliance with requirements indicated:

1. Each type of masonry unit required.

a. Include test results, measurements and calculations establishing net-area compressive strength of masonry units.

Retain subparagraph below only if unit-strength method was retained in "Performance Requirements" Article above or if requirements for net-area compressive strength of units are retained in Part 2.

Delete subparagraph below if mortar is specified to comply with proportion specification.

2. Mortar complying with property requirements of ASTM C 270.

3. Grout mixes complying with compressive strength requirements of ASTM C 476. Include description of type and proportions of grout ingredients.

See Editing Instruction No. 3 in the Evaluations for information on material certificates.

Delete below if not required.

1.5 QUALITY ASSURANCE

Retain paragraph below to establish qualifications for testing agencies employed by Contractor or Owner.

A. Testing Agency Qualifications: An independent testing agency, acceptable to authorities having jurisdiction, qualified according to ASTM C 1093 to conduct the testing indicated, as documented according to ASTM E 548.

B. Source Limitations for Masonry Units: Obtain exposed masonry units of a uniform texture and color or a uniform blend within the ranges accepted for these characteristics, through one source from a single manufacturer for each product required.

C. Source Limitations for Mortar Materials: Obtain mortar ingredients of a uniform quality, including color for exposed masonry, from one manufacturer for each cementitious component and from one source or producer for each aggregate.

D. Pre-construction Testing Service: Engage a qualified independent testing agency to perform the following pre-construction testing:

Select paragraph above or below. See Editing Instruction No. 3 in the Evaluations for information on preconstruction testing.

E. Pre-construction Testing: Contractor will provide the following test results prior to starting construction:

Retain appropriate subparagraphs below with either paragraph above.

1. Concrete Masonry Unit Test: For each concrete masonry unit indicated, per ASTM C 140.

Usually retain test methods above. Retain subparagraph below only if prism test was specified in "Performance Requirements" Article for determining compressive strength of masonry.

Delete subparagraph below if mortar is specified to comply with proportion specification.

2. Mortar Test: For mortar properties per ASTM C 270.

Delete subparagraph below if grout is specified by proportions given in ASTM C 476 or UBC Standard 21-19 rather than by compressive strength.

3. Grout Test: For compressive strength per ASTM C 1019.

Delete paragraph below if fire-rated masonry is not used.

Delete below if work of this Section is not extensive or complex enough to justify a preinstallation conference. If retaining, coordinate with Division 1.

1.6 DELIVERY, STORAGE AND HANDLING

A. Store masonry units on elevated platforms in a dry location. If units are not stored in an enclosed location, cover tops and sides of stacks with waterproof sheeting, securely tied. If units become wet, do not install until they are dry.

Delete subparagraph below if Type I concrete masonry units are not required.

1. Protect Type I concrete masonry units from moisture absorption so that, at the time of installation, the moisture content is not more than the maximum allowed at the time of delivery.

B. Store cementitious materials on elevated platforms, under cover and in a dry location. Do not use cementitious materials that have become damp.

C. Store aggregates where grading and other required characteristics can be maintained and contamination avoided.

Delete two paragraphs above and retain paragraph below if preblended, dry mortar mix is required.

D. Deliver pre-blended, dry mortar mix in moisture-resistant containers designed for lifting and emptying into dispensing silo. Store pre-blended, dry mortar mix in delivery containers on elevated platforms, under cover and in a dry location or in a metal dispensing silo with weatherproof cover.

E. Store masonry accessories, including metal items, to prevent corrosion and accumulation of dirt and oil.

1.7 PROJECT CONDITIONS

A. Stain Prevention: Prevent grout, mortar and soil from staining the face of masonry to be left exposed or painted. Immediately remove grout, mortar and soil that come in contact with such masonry.

1. Protect base of walls from rain-splashed mud and from mortar splatter by coverings spread on ground and over wall surface.

2. Protect surfaces of gate frames, as well as similar products with painted and integral finishes, from mortar droppings.

3. Turn scaffold boards near the wall on edge at the end of each day to prevent rain from splashing mortar and dirt onto completed masonry.

B. Cold-Weather Requirements: Do not use frozen materials or materials mixed or coated with ice or frost. Do not build on frozen substrates. Remove and replace unit masonry damaged by frost or by freezing conditions. Comply with cold-weather construction requirements contained in Section 2104.3 of the Uniform Building Code.

1. Cold-Weather Cleaning: Use liquid cleaning methods only when air temperature is 40 deg F (4 deg C) and above and will remain so until masonry has dried, but not less than 7 days after completing cleaning.

C. Hot-Weather Requirements: Protect unit masonry work when temperature and humidity conditions produce excessive evaporation of water from mortar and grout. Provide artificial shade and wind breaks and use cooled materials as required.

1. When ambient temperature exceeds 100 deg F (38 deg C), or 90 deg F (32 deg C) with a wind velocity greater than 8 mph (13 km/h), do not spread mortar beds more than 48 inches (1200 mm) ahead of masonry. Set masonry units within one minute of spreading mortar.

PART 2 - PRODUCTS

2. List Level 2

2.1 CONCRETE MASONRY UNITS

A. General: Provide shapes indicated and as follows:

Show details on Drawings of special conditions and special shapes needed. Revise subparagraph below to suit Project.

1. Provide special shapes for lintels, corners, jambs, sash, control joints, headers, bonding and other special conditions.

B. Concrete Masonry Units: ASTM C 90 and as follows:

See Editing Instructions No. 2 and No. 4 in the Evaluations before retaining unit compressive strengths and weight classifications in subparagraphs below. Delete subparagraph below if "Performance Requirements" Article was retained. Minimum average net-area compressive strength per ASTM C 90 is 1900 psi (13.1 MPa).

1. Precision Concrete Masonry Units and Concrete Masonry Units with split face texture on exposed face(s).

2. Unit Compressive Strength: Provide units with minimum average net-area compressive strength of 1900 psi (13.1 MPa).

Select one of three weights below or delete subparagraph for Contractor's option. Retain ", unless otherwise indicated" for default requirement if more than one weight is used.

3. Weight Classification: Medium weight, unless otherwise indicated.

4. Provide Type I, moisture-controlled units.

Select subparagraph above or below. Verify local availability of Type I units before retaining.

5. Size: Manufactured to the following dimensions:

a. 6 inches (152 mm) nominal; 5-5/8 inches (143 mm) actual.

b. 8 inches (203 mm) nominal; 7-5/8 inches (194 mm) actual.

6. Exposed Faces: Manufacturer’s standard color and texture, unless otherwise indicated.

Delete subparagraph below if direct application of plaster is not used.

a. Where units are to receive a direct application of plaster, provide textured-face units made with gap-graded aggregates.

Retain subparagraph below, if desired, to control appearance of exposed units. ASTM C 90 requires at least four units for sample, representing the range of color and texture permitted.

b. Where units are to be left exposed, provide color and texture matching the range represented by submitted sample.

2.2

BRICK

A.

General: Provide shapes indicated and as follows for each form of brick required:

1.

Provide units without cores or frogs and with exposed surfaces finished for ends of sills and caps and for similar applications that would otherwise expose unfinished brick surfaces.

B.

Provide special shapes for applications requiring brick of size, form, color, and texture on exposed surfaces that cannot be produced by sawing.

1.

Provide special shapes for applications where stretcher units cannot accommodate special conditions, including those at corners, movement joints, bond beams, sashes, and lintels.

2. Provide special shapes for applications where shapes produced by sawing would result in sawed surfaces being exposed to view.

2.2 MORTAR AND GROUT MATERIALS

Retain one or more of first five paragraphs below. Delete masonry cement if not allowed by "Mortar and Grout Mixes" Article below. See Evaluations for discussion of masonry cement and mortar cement.

A. Portland Cement: ASTM C 150, Type II. Provide natural color or white cement as required to produce mortar color indicated.

B. Hydrated Lime: ASTM C 207, Type S.

Mix below allows better control of color than does job-mixed, portland cement-lime mortar with pigment added.

C. Portland Cement-Lime Mix: Packaged blend of portland cement complying with ASTM C 150, Type II, and hydrated lime complying with ASTM C 207.

D. Mortar Cement: UBC Standard 21-14.

E. Masonry Cement: ASTM C 91.

Insert applicable subparagraphs below under one or more of three paragraphs above.

1. For pigmented mortar, use a colored cement formulation as required to produce the color indicated, or if not indicated, as selected from manufacturer’s standard formulations.

a. Pigments shall not exceed 10 percent of portland cement by weight for mineral oxides nor 2 percent for carbon black.

b. Pigments shall not exceed 5 percent of masonry cement by weight for mineral oxides nor 1 percent for carbon black.

Delete subparagraphs above or subparagraph below, or both.

2. For colored-aggregate mortar, use natural color or white cement as necessary to produce required mortar color.

F. Aggregate for Mortar: ASTM C 144.

Retain subparagraph below for white mortar.

1. White-Mortar Aggregates: Natural white sand or ground white stone.

Retain subparagraph below for colored-aggregate mortar.

2. Colored-Mortar Aggregates: Natural-colored sand or ground marble, granite or other sound stone; of color necessary to produce required mortar color.

G. Aggregate for Grout: ASTM C 404.

Retain paragraph below for colored cement or for pigments added at Project site.

H. Mortar Pigments: Natural and synthetic iron oxides and chromium oxides, compounded for use in mortar mixes. Use only pigments with a record of satisfactory performance in masonry mortar.

Paragraph below is an example requirement for a concrete admixture often used in cold weather as an antifreeze. ASTM C 270 appendix and BIA recommend against using any admixtures.

I. Cold-Weather Admixture: Non-chloride, non-corrosive, accelerating admixture complying with ASTM C 494, Type C, and recommended by the manufacturer for use in masonry mortar of composition indicated.

Retain paragraph below if integral water repellent is used in concrete masonry units.

J. Water-Repellent Admixture: Liquid water-repellent mortar admixture intended for use with concrete masonry units, containing integral water repellent by same manufacturer.

K. Water: Potable.

L. Manufacturers and/or Products: Subject to compliance with requirements, manufacturers offering products equal to the specified manufacturer may be considered, but are not limited to, the following:

Retain above for nonproprietary or below for semiproprietary Specification. Refer to Division 1 Section "Materials and Equipment."

See Editing Instruction No. 1 in the Evaluations for cautions about naming products and manufacturers. Below are examples only. Retain or insert only those products that correspond with other requirements.

1. Colored Portland Cement-Lime Mix:

a. Eaglebond; Blue Circle Cement.

b. Color Mortar Blend; Glen-Gery Corporation.

c. Rainbow Mortamix Custom Color Cement/Lime; Holnam, Inc.

d. Centurion Colorbond PL; Lafarge Corporation.

e. Lehigh Custom Color Portland/Lime; Lehigh Portland Cement Co.

f. Riverton Portland Cement Lime Custom Color; Riverton Corporation (The).

2. Mortar Cement:

a. Magnolia Superbond Mortar Cement; Blue Circle Cement.

b. Lafarge Mortar Cement; Lafarge Corporation.

3. Colored Mortar Cement:

a. Magnolia Superbond Mortar Cement; Blue Circle Cement.

4. Colored Masonry Cement:

a. Magnolia Masonry Cement; Blue Circle Cement.

b. Brixment-in-Color; Essroc Materials, Inc.

c. Rainbow Mortamix Custom Color Masonry Cement; Holnam, Inc.

d. Centurion Colorbond; Lafarge Corporation.

e. Lehigh Custom Color Masonry Cement; Lehigh Portland Cement Co.

f. Coosa Masonry Cement; National Cement Company, Inc.

g. Flamingo Color Masonry Cement; Riverton Corporation (The).

h. Richcolor Masonry Cement; Southdown, Inc.

5. Mortar Pigments:

a. True Tone Mortar Colors; Davis Colors.

b. Centurion Pigments; Lafarge Corporation.

c. SGS Mortar Colors; Solomon Grind-Chem Services, Inc.

6. Cold-Weather Admixture:

a. Accelguard 80; Euclid Chemical Co.

b. Morseled; W. R. Grace & Co., Construction Products Division.

c. Trimix-NCA; Sonneborn, Div. of ChemRex, Inc.

7. Water-Repellent Admixture:

a. Mortar Tite; Addiment Inc.

b. Dry-Block Mortar Admixture; W. R. Grace & Co., Construction Products Division.

c. Rheopel; Master Builders.

2.3 REINFORCING STEEL

Retain required products below.

A. Uncoated Steel Reinforcing Bars: ASTM A 615/A 615M, Grade 60.

Select paragraph above or below or both; if retaining both, show locations of each on plans or revise below to indicate where epoxy-coated bars are required. Revise below to specify galvanized bars complying with ASTM A 767/A 767M if required. Revise either or both paragraphs if another grade of steel is required.

2.4 TIES AND ANCHORS, GENERAL

A. General: Provide ties and anchors, specified in subsequent articles, made from materials that comply with this Article, unless otherwise indicated.

Retain from paragraphs below only those materials referenced in subsequent articles.

Paragraph below is allowed only for anchors and ties in interior walls where humidity is less than 75 percent.

B. Mill Galvanized Carbon-Steel Wire: ASTM A 82; with ASTM A 641 (ASTM A 641M), Class 1 coating.

C. Hot-Dip Galvanized Carbon-Steel Wire: ASTM A 82; with ASTM A 153, Class B-2 coating.

Delete Type 304 in paragraph below if higher corrosion resistance is required.

D. Stainless-Steel Wire: ASTM A 580/A 580M, Type 304 or 316.

Paragraph below is allowed only for anchors and ties in interior walls where humidity is less than 75 percent.

E. Galvanized Steel Sheet: ASTM A 653/A 653M, G60 (Z180), commercial-quality, steel sheet zinc coated by hot-dip process on continuous lines before fabrication.

F. Steel Sheet, Galvanized after Fabrication: ASTM A 366/A 366M cold-rolled, carbon-steel sheet hot-dip galvanized after fabrication to comply with ASTM A 153.

Delete Type 304 in paragraph below if higher corrosion resistance is required.

G. Stainless-Steel Sheet: ASTM A 666, Type 304 or 316.

Retain below if required for rigid anchors.

H. Steel Plates, Shapes and Bars: ASTM A 36/A 36M.

2.5 ADJUSTABLE ANCHORS FOR CONNECTING TO STEEL FRAME

Retain this Article if applicable to Project. Indicate details on Drawings.

A. General: Provide two-piece assemblies that allow vertical or horizontal adjustment but resist tension and compression forces perpendicular to plane of wall.

1. Anchor Section: Crimped 1/4-inch- (6.4-mm-) diameter, hot-dip galvanized steel wire anchor section for welding to steel. Mill galvanized wire may be used at interior walls where humidity does not exceed 75 percent.

2. Tie Section: Triangular-shaped wire tie, sized to extend within 1 inch (25 mm) of masonry face, made from 0.25-inch- (6.4-mm-) diameter, hot-dip galvanized steel wire. Mill galvanized wire may be used at interior walls where humidity does not exceed 75 percent.

2.6 MORTAR AND GROUT MIXES

A. General: Do not use admixtures, including pigments, air-entraining agents, accelerators, retarders, water-repellent agents, antifreeze compounds or other admixtures, unless otherwise indicated.

1. Do not use calcium chloride in mortar or grout.

Delete subparagraph below if cold-weather admixture is not retained.

2. Add cold-weather admixture (if used) at the same rate for all mortar, regardless of weather conditions, to ensure that mortar color is consistent.

Retain paragraph below if preblended mix is required.

B. Pre-blended, Dry Mortar Mix: Furnish dry mortar ingredients in the form of a pre-blended mix. Measure quantities by weight to ensure accurate proportions and thoroughly blend ingredients before delivering to Project site.

Retain and edit one of two paragraphs below. See Evaluations.

C. Mortar for Unit Masonry: Comply with ASTM C 270.

Retain subparagraph below to allow use of extended-life (ready-mixed) mortar if acceptable and available in Project location. Usually select property specification above if retaining below.

1. Limit cementitious materials in mortar for reinforced masonry to portland cement, mortar cement and lime.

Select subparagraph above or below, or delete both if masonry cement is acceptable. Retain below if masonry cement is acceptable for unreinforced interior masonry.

Delete subparagraph below if no masonry is grouted and reinforced with steel reinforcing bars.

2. For reinforced masonry use Type S.

Delete paragraph and subparagraphs below if colored cement was required in "Mortar and Grout Materials" Article above.

D. Grout for Unit Masonry: Comply with ASTM C 476.

1. Use grout of type indicated, or if not otherwise indicated, of type (fine or coarse) that will comply with UBC Table 21-C for dimensions of grout spaces and pour height.

2. Provide grout with a slump of 8 to 11 inches (200 to 280 mm) as measured according to ASTM C 143.

PART 3 - EXECUTION

3. List Level 3

3.1 EXAMINATION

A. Examine conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance.

Delete subparagraph below if not required.

1. For the record, prepare written report, endorsed by Installer, listing conditions detrimental to performance.

2. Verify that foundations are within tolerances specified.

Delete subparagraph below if not applicable.

3. Verify that reinforcing dowels are properly placed.

4. Proceed with installation only after unsatisfactory conditions have been corrected.

B. Before installation, examine rough-in and built-in construction to verify actual locations of piping connections.

3.2 INSTALLATION, GENERAL

A. Leave openings for equipment to be installed before completing masonry. After installing equipment, complete masonry to match the construction immediately adjacent to the opening.

B. Cut masonry units with motor-driven saws to provide clean, sharp, unchipped edges. Cut units as required to provide a continuous pattern and to fit adjoining construction. Where possible, use full-size units without cutting. Allow units cut with water-cooled saws to dry before placing, unless wetting of units is specified. Install cut units with cut surfaces and, where possible, cut edges concealed.

C. Select and arrange units for exposed unit masonry to produce a uniform blend of colors and textures.

Subparagraph below is "means and methods" but does help ensure uniformity of blend.

1. Mix units from several pallets or cubes as they are placed.

Delete paragraph below if not applicable.

D. Matching Existing Masonry: Match coursing, bonding, color and texture of existing masonry.

Retain below for high-suction brick. A simple test to determine if wetting is required consists of drawing a circle the size of a quarter on a brick and placing 20 drops of water in the circle; if water is absorbed within 1-1/2 minutes, the brick requires wetting.

3.3 CONSTRUCTION TOLERANCES

A. Comply with tolerances in ACI 530.1/ASCE 6/TMS 602 and the following:

B. For conspicuous vertical lines, such as external corners, door jambs, reveals and expansion and control joints, do not vary from plumb by more than 1/4 inch in 20 feet (6 mm in 6 m), nor 1/2 inch (12 mm) maximum.

C. For vertical alignment of exposed head joints, do not vary from plumb by more than 1/4 inch in 10 feet (6 mm in 3 m), nor 1/2 inch (12 mm) maximum.

D. For conspicuous horizontal lines, such as exposed lintels, sills, parapets and reveals, do not vary from level by more than 1/4 inch in 20 feet (6 mm in 6 m), nor 1/2 inch (12 mm) maximum.

If Type FBS Rough or Type FBA brick is used, revise tolerances below to allow for variation in brick size. Consider restricting tolerances if Type FBX brick is used.

E. For exposed bed joints, do not vary from thickness indicated by more than plus or minus 1/8 inch (3 mm), with a maximum thickness limited to 1/2 inch (12 mm). Do not vary from bed-joint thickness of adjacent courses by more than 1/8 inch (3 mm).

F. For exposed head joints, do not vary from thickness indicated by more than plus or minus 1/8 inch (3 mm). Do not vary from adjacent bed-joint and head-joint thicknesses by more than 1/8 inch (3 mm).

3.4 LAYING MASONRY WALLS

A. Lay out walls in advance for accurate spacing of surface bond patterns with uniform joint thicknesses and for accurate location of openings, movement-type joints, returns and offsets. Avoid using less-than-half-size units, particularly at corners, jambs and, where possible, at other locations.

B. Bond Pattern for Exposed Masonry: Lay exposed masonry in the following bond pattern; do not use units with less than nominal 4-inch (100-mm) horizontal face dimensions at corners or jambs.

Pattern is usually running bond. If other bond patterns are required, they must be specified below or indicated on Drawings.

1. One-half running bond with vertical joint in each course centered on units in courses above and below.

C. Stopping and Resuming Work: In each course, rack back one-half-unit length for one-half running bond or one-third-unit length for one-third running bond; do not tooth. Clean exposed surfaces of set masonry, wet clay masonry units lightly, if required, and remove loose masonry units and mortar before laying fresh masonry.

D. Built-in Work: As construction progresses, build in items specified under this and other Sections of the Specifications. Fill in solidly with masonry around built-in items.

Revise paragraph below if flexible perimeter joint or thermal break is required.

E. Fill space between hollow-metal frames and masonry solidly with mortar, unless otherwise indicated.

Delete paragraph above and below if not applicable.

3.5 MORTAR BEDDING AND JOINTING

Delete paragraph and subparagraphs below if no hollow concrete masonry units are required. Mortar bedding of cross webs should be added if required.

A. Lay hollow masonry units as follows:

1. With full mortar coverage on horizontal and vertical face shells.

2. Bed webs in mortar in starting course on footings and in all courses of piers, columns and pilasters.

If another joint profile is used, revise paragraph below or show on Drawings.

B. Tool exposed joints slightly concave when thumbprint hard, using a jointer larger than the joint thickness, unless otherwise indicated.

C. Cut joints flush for masonry walls to receive plaster or other direct-applied finishes (other than paint), unless otherwise indicated.

Retain all text in paragraph below if full collar joints are required for all walls and partitions, or edit for limited requirements. Retain below if all wythes are needed to meet height-to-thickness ratio of codes.

3.6 CONTROL AND EXPANSION JOINTS

A. General: Install control and expansion joints in unit masonry where indicated. Build-in related items as masonry progresses. Do not form a continuous span through movement joints unless provisions are made to prevent in-plane restraint of wall or partition movement.

Show locations of joints on Drawings.

3.7 REINFORCED UNIT MASONRY INSTALLATION

Usually retain paragraph and subparagraphs below only if reinforced masonry beams, slabs, soffits, and similarly formed elements are required.

A. Temporary Formwork and Shores: Construct formwork and shores to support reinforced masonry elements during construction.

1. Construct formwork to conform to shape, line and dimensions shown. Make it sufficiently tight to prevent leakage of mortar and grout. Brace, tie and support forms to maintain position and shape during construction and curing of reinforced masonry.

2. Do not remove forms and shores until reinforced masonry members have hardened sufficiently to carry their own weight and other temporary loads that may be placed on them during construction.

B. Placing Reinforcement: Comply with requirements of Section 2104.5 of the Uniform Building Code.

C. Grouting: Do not place grout until entire height of masonry to be grouted has attained sufficient strength to resist grout pressure.

1. Comply with requirements of Section 2104.6 of the Uniform Building Code for cleanouts and for grout placement, including minimum grout space and maximum pour height.

3.8 FIELD QUALITY CONTROL

See Editing Instruction No. 11 in the Evaluations before editing this Article.

A. Engage a qualified independent testing agency to perform field quality-control testing indicated below.

Testing frequency below is required by the 1997 Uniform Building Code when full allowable stresses are used in the design of masonry and by MSJC Specification when prism or grout testing is required.

B. Testing Frequency: Tests and Evaluations listed in this Article will be performed during construction for each 5000 sq. ft. (465 sq. m) of wall area or portion thereof.

Testing requirements for mortar and grout may be deleted if prism testing is retained.

C. Mortar properties will be tested per UBC Standard 21-16.

D. Grout will be sampled and tested for compressive strength per UBC Standard 21-18.

Retain paragraph above and below if subject to the 1997 Uniform Building Code and if unit-strength method is used. Delete above and below and retain unit tests in "Source Quality Control" Article if masonry is designed according to MSJC Code and unit-strength method is used. Delete unit tests at both locations if prism testing is retained.

E. Concrete Masonry Unit Tests: For each type of concrete masonry unit indicated, units will be tested according to ASTM C 140.

Delete paragraph below if unit-strength method is selected. Below is required if prism-test method is used to establish compliance with specified compressive strength of masonry.

3.9 PARGING

A. Parge pre-dampened masonry walls, where indicated, with Type S mortar applied in two uniform coats to a total thickness of 3/4 inch (19 mm). Scarify first parge coat to ensure full bond to subsequent coat.

B. Use a steel-trowel finish to produce a smooth, flat, dense surface with a maximum surface variation of 1/8 inch per foot (3 mm per 300 mm). Form a wash at top of parging and a cove at bottom.

C. Damp-cure parging for at least 24 hours and protect the parging until cured.

3.10 REPAIRING, POINTING AND CLEANING

A. Remove and replace masonry units that are loose, chipped, broken, stained or otherwise damaged or that do not match adjoining units. Install new units to match adjoining units; install in fresh mortar, pointed to eliminate evidence of replacement.

B. Pointing: During the tooling of joints, enlarge voids and holes, except weep holes, and completely fill with mortar. Point up joints, including corners, openings and adjacent construction, to provide a neat, uniform appearance. Prepare joints for sealant application.

C. In-Progress Cleaning: Clean unit masonry as work progresses by dry brushing to remove mortar fins and smears before tooling joints.

D. Final Cleaning: After mortar is thoroughly set and cured, clean exposed masonry as follows:

1. Remove large mortar particles by hand with wooden paddles and non-metallic scrape hoes or chisels.

2. Test cleaning methods on sample wall panel; leave one-half of panel uncleaned for comparison purposes. Obtain Contracting Officer’s approval of sample cleaning before proceeding with cleaning of masonry.

3. Protect adjacent stone and non-masonry surfaces from contact with cleaner by covering them with liquid strippable masking agent, polyethylene film or waterproof masking tape.

Delete subparagraph above and below if no cleaners are specified in Part 2 or if no cleaners are allowed.

4. Wet wall surfaces with water before applying cleaners; remove cleaners promptly by rinsing the surfaces thoroughly with clear water.

Select subparagraph above or below. Coordinate with products retained in Part 2. If high-pressure water cleaning or other methods are acceptable, delete or revise below and insert applicable requirements.

5. Clean masonry with a proprietary acidic cleaner applied according to manufacturer’s written instructions.

6. Clean concrete masonry by cleaning method indicated in NCMA TEK 8-2 applicable to type of stain on exposed surfaces.

Delete below if no limestone trim.

3.11 MASONRY WASTE DISPOSAL

Retain this Article if clean masonry waste can be used as fill. This diverts some material from the waste stream, conserving landfill space.

A. Recycling: Unless otherwise indicated, excess masonry materials are Contractor’s property. At completion of unit masonry work, remove from Project site.

END OF SECTION 04810

UNIT MASONRY ASSEMBLIES

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