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SECTION 04221
BURNISHED CONCRETE MASONRY UNITS
 
 
Copyright 2013 - 2017 ARCAT, Inc. - All rights reserved
** NOTE TO SPECIFIER ** County Materials Corporation; burnished concrete units, ground face concrete masonry units, burnished CMUs.
This section is based on the products of County Materials Corporation, which is located at:
205 North St.
P. O. Box 100
Marathon, WI 54448-0100
Toll Free: 800-242-7733
Email: info@countymaterials.com
Web Site: www.countymaterials.com
County Materials Corporation is the industry's resource for high quality concrete construction and landscape products. Our diverse product lines offer superior strength, lasting durability, competitive pricing and ready availability.
We are committed to providing unparalleled service to our valued customers. Our products are used with confidence by construction professionals every day for project applications of all sizes.
 
PART 1 GENERAL
 
1.1
SECTION INCLUDES
 
** NOTE TO SPECIFIER ** Delete items below not required for project.
 
A.
Loadbearing burnished concrete masonry units.
B.
Non-loadbearing burnished concrete masonry units.
1.2
RELATED SECTIONS
 
** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
 
A.
Section 04070 - Mortar and Masonry Grout.
B.
Section 04080 - Masonry Reinforcement Systems.
C.
Section 04810 - Unit Masonry Assemblies.
D.
Section 04856 - Concrete Thin Veneers.
E.
Section 07600 - Flashing and Sheet Metal.
1.3
REFERENCES
 
** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
 
A.
ASTM International (ASTM):
1.
ASTM A 82 / A 82M - Standard Specification for Steel Wire, Plain, for Concrete Reinforcement.
2.
ASTM A 153 - Standard Specification for Zinc-Coated (Hot Dip) on Iron and Steel Hardware.
3.
ASTM A 496 / A 496M - Standard Specification Steel Wire, Deformed, for Concrete Reinforcement.
4.
ASTM A 641 / A 641M - Standard Specification for Zinc-Coated (Galvanized) Carbon Steel Wire.
5.
ASTM A 951 / A 951M - Standard Specification for Steel Wire for Masonry Joint Reinforcement.
6.
ASTM C 90 - Standard Specification for Loadbearing Concrete Masonry Units.
7.
ASTM C 91 - Standard Specification for Masonry Cement.
8.
ASTM C 140 - Standard Test Methods for Sampling and Testing Concrete Masonry Units and Related Units.
9.
ASTM C 143 / C 143M - Standard Test Method for Slump of Hydraulic-Cement Concrete.
10.
ASTM C 144 - Standard Specification for Aggregate for Masonry Mortar.
11.
ASTM C 150 - Standard Specification for Portland Cement.
12.
ASTM C 207 - Standard Specification for Hydrated Lime for Masonry Purposes.
13.
ASTM C 270 - Standard Specification for Mortar for Unit Masonry.
14.
ASTM C 476 - Standard Specification for Grout for Masonry.
15.
ASTM C 920 - Standard Specification for Elastomeric Joint Sealants.
16.
ASTM C 1330 - Standard Specification for Cylindrical Sealant Backing for Use with Cold Liquid Applied Sealants.
17.
ASTM D 2240 - Standard Test Method for Rubber Property - Durometer Hardness.
B.
International Building Code (IBC).
1.
IBC - Chapter 7 Fire-Resistance-Rated Construction 721.3 Concrete Masonry.
2.
IBC - Chapter 21 Masonry.
C.
Masonry Standards Joint Committee (MSJC):
1.
Building Code Requirements for Masonry Structures.
2.
Specifications for Masonry Structures.
D.
National Concrete Masonry Association (NCMA): TEK Manual for Concrete Masonry Design and Construction.
E.
American Concrete Institute (ACI): ACI 117- Specification for Tolerances for Concrete Construction and Materials.
1.4
SUBMITTALS
A.
Submit under provisions of Section 01300.
B.
Product Data: Manufacturer's data sheets on each product to be used, including:
1.
Storage and handling requirements and recommendations.
2.
Installation methods.
3.
Cleaning and maintenance instructions provided by cleaning and sealing agent manufacturer.
C.
Certificates: Letter of compliance to specified performance requirements.
D.
Test Reports:
1.
Dimensional Analysis.
2.
Absorption Analysis.
3.
Compressive Strength Analysis.
E.
Verification Samples: For each product specified, two samples, representing types, colors, textures, and finishes to be installed.
 
** NOTE TO SPECIFIER ** Paragraph below is for project requiring LEED certification. Delete if not required.
 
F.
USGBC LEED Submittals: Submit manufacturer's documentation of the following items:
 
** NOTE TO SPECIFIER ** Subparagraph below applies to Credit MR 4.1 and MR 4.2. Delete if not required.
 
1.
MR Credit 4.1 and 4.2: Recycled content of products, indicating percentages of supplementary cementitious content.
 
** NOTE TO SPECIFIER ** Subparagraph below applies to Credit MR 5.1 and MR 5.2. Delete if not required.
 
2.
MR Credit 5.1 and 5.2: For projects within 500 miles of manufacturing location where materials are extracted, processed and manufactured.
1.5
QUALITY ASSURANCE
A.
Regulatory Requirements and Approvals: provide applicable licensing, bonding or other requirements of regulatory agencies.
 
** NOTE TO SPECIFIER ** Include a mock-up if the project size and/or quality warrant taking such a precaution. The following is one example of how a mock-up on a large project might be specified. When deciding on the extent of the mock-up, consider all the major different types of work on the project.
 
B.
Mock-Up: Provide a mock-up for evaluation of surface preparation techniques and application workmanship.
1.
Construct a separate (not part of the actual building) sample wall panel not less than 4 feet by 4 feet (1.2 m x 1.2 m) with units in the pattern, type, color, texture, finish and shape as indicated on Drawings and specifications. Water repellent in mortar, cleaning and sealing agents and methods shall be performed prior to approval of the sample panel.
2.
Do not proceed with remaining work until workmanship, patterns, types, colors, textures, finishes, shape, application methods for water repellent in mortar, and cleaning and sealing agents are approved by Architect. Maintain Mock-up during construction for workmanship standard.
3.
Rework mock-up area as required to produce acceptable work.
1.6
DELIVERY, STORAGE & HANDLING
A.
Deliver, store and handle materials and products in strict compliance with manufacturer's instructions and recommendations. Stack cubes only one cube high. Protect from damage.
B.
Comply with manufacturer's ordering instructions and lead-time requirements to avoid construction delays.
C.
Delivery: Deliver units in manufacturer's unopened, labeled, packaging. Units shall be inspected upon delivery. Defective units shall be removed immediately.
D.
Storage: Store materials off the ground and keep free from groundwater, soil contamination, mud and dust. Materials shall be protected from precipitation and harmful weather conditions. Product with visible frozen moisture shall not be installed.
E.
Handling: Units shall be handled in a manner that prevents breakage and damage.
1.7
PROJECT/SITE CONDITIONS
A.
Environmental Requirements:
1.
Protect CMUs from rain and freezing temperatures prior to, during, and for 48 hours after installation of materials.
2.
When ambient temperature is below 40 degrees F (4.4 degrees C) or exceeds 90 degrees F (32.2 degrees C), comply with requirements for project conditions in accordance with MSJC Specification for Masonry Structures including the following:
a.
Par. 1.8 C. Cold Weather Construction.
b.
Par. 1.8 D. Hot Weather Construction.
3.
Do not continue masonry construction during heavy rains, as partially set or plastic mortar is susceptible to washout until 8 to 24 hours of curing occurs (depending upon environmental conditions).
4.
When rain is likely, cover construction materials. Newly constructed masonry shall be protected from rain by draping a weather-resistant covering over the assembly. The cover shall be secured in place and extend over mortar that is susceptible to washout.
PART 2 PRODUCTS
 
2.1
MANUFACTURERS
A.
Acceptable Manufacturer: County Materials Corporation, which is located at: 205 North St. P. O. Box 100; Marathon, WI 54448-0100; Toll Free Tel: 800-242-7733; Tel: 715-848-1365; Fax: 715-443-3691; Email: request info (info@countymaterials.com); Web: www.countymaterials.com
 
** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
 
B.
Substitutions: Not permitted.
C.
Requests for substitutions will be considered in accordance with provisions of Section 01600.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
2.2
BURNISHED MASONRY UNITS
A.
Product: Premier Ultra Burnished masonry units as manufactured and distributed by County Materials Corporation.
B.
Integrally Pigmented Burnished Units.
1.
Description: Integrally pigmented hollow units with burnished faces as scheduled or required and with a net area compressive strength of greater than or equal to 2000 psi.
2.
Compliance: ASTM C 90.
3.
Coloring: Integral, through-body coloring; synthetic or natural iron oxide pigments.
4.
Integral Water Repellent.
 
** NOTE TO SPECIFIER ** Premier Ultra Burnished masonry units are available in multiple shapes and a variety of sizes. Delete size not required.
 
5.
Size and Shape: Full depth units as indicated on Drawings.
6.
Size and Shape: Oversize units as indicated on Drawings.
7.
Size and Shape: Thin veneer units as indicated on Drawings.
8.
Size and Shape: As indicated on Drawings.
 
** NOTE TO SPECIFIER ** Delete color options not required.
 
9.
Color: As selected from manufacturer's standard range
10.
Color: As indicated on the Drawings.
11.
Color: ______.
2.3
REINFORCEMENT AND ANCHORAGE
 
** NOTE TO SPECIFIER ** Delete option not required.
 
A.
Single-Wythe Joint Reinforcement for Single-Wythe Concrete Units:
1.
Truss Type; Fabricated from cold drawn steel wire ASTM A 82; conforming to ASTM A 951; 9 gauge deformed side rods conforming to ASTM A 496 / A 496M; 9 gauge cross rods.
 
** NOTE TO SPECIFIER ** Delete coating for corrosion protection not required.
 
2.
Coatings for Corrosion Protection: Mill galvanized per ASTM A 641 /A 641M, Zinc Coated (0.1 oz. per sq.ft.).
3.
Coatings for Corrosion Protection: Hot-dipped galvanized per ASTM A 153 / A 153M Class B.
4.
Width selected shall be approximately 2 inches (51 mm) less than nominal width of Concrete Unit.
5.
Install continuously in horizontal mortar joints in vertical intervals of not more than 16 inches (406 mm).
6.
Type and Manufacturer: _______.
 
** NOTE TO SPECIFIER ** Horizontal Joint Reinforcement is critical for successful performance of Concrete Masonry. Joint Reinforcement must be included in addition to specified veneer anchors. These two components are typically field installed in alternating course.
 
B.
Veneer Joint Reinforcement for Concrete Facing Units:
1.
Truss Type: Fabricated from cold drawn steel wire ASTM A 82; conforming to ASTM A 951; 9 gauge deformed side rods conforming to ASTM A 496 / A 496M; 9 gauge cross rods.
 
** NOTE TO SPECIFIER ** Delete option below not required.
 
2.
Coating for Corrosion Protection: Mill galvanized per ASTM A 641 / A 641M, Zinc Coated (0.1 oz. per sq.ft.).
3.
Coating for Corrosion Protection: Hot-dipped galvanized per ASTM A 153 / A 153M Class B.
4.
Width: Nominal 4 inch wire; actual - approximately 2 inches.
5.
Install continuously in horizontal mortar joints in vertical intervals of not more than 16 inches (406 mm) O.C.
6.
Type and Manufacturer: _______.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
C.
Veneer Anchors for Concrete Facing Units with CMU back-up: Ladder Type with Ties.
1.
Truss Portion: Fabricated from cold drawn steel wire ASTM A 82; conforming to ASTM A 951; 9 gauge deformed side rods conforming to ASTM A 496 / A 496M; 9 gauge cross rods.
a.
Hot-dipped galvanized per ASTM A 153 / A 153M Class B.
b.
3/16 inch (4.76 mm) diameter wire tabs shall be welded to truss portion at 16 inch (406 mm) O.C. horizontal spacing.
2.
Ties: 3/16 inch (4.76 mm) diameter wire; Hot-dipped galvanized ASTM A 153 / A 153M Class B.
3.
Truss width shall be approximately 2 inches (51 mm) less than nominal width of Concrete Masonry Unit. Ties shall be of sufficient length to embed longitudinal portion of tie into center of veneer +/- 1 inch (25 mm).
4.
Install continuously in horizontal mortar joints in vertical intervals of not more than 16 inches (406 mm).
5.
Type and Manufacturer: _______.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
D.
Veneer Anchors for Concrete Facing Units with Steel Stud back-up: 2-Piece anchors.
1.
Plate Portion: 14 gauge; Hot-dipped galvanized ASTM A 153 / A 153M Class B.
2.
Ties: 3/16 inch (4.76 mm) diameter wire; Hot-dipped galvanized ASTM A 153 / A 153M Class B.
3.
Ties shall be of sufficient length to embed longitudinal portion of tie into center of unit veneer +/- 1 inch (25 mm).
4.
Install continuously in both horizontal and vertical intervals of not more than 16 inch (406 mm) O.C.
5.
Type and Manufacturer: _______.
2.4
FLASHING
 
** NOTE TO SPECIFIER ** Delete if not required.
 
A.
Flashing for Single-Wythe Concrete Units:
1.
Embedded, overlapping, polypropylene pan system with integral weep spouts.
2.
Flashing shall be installed at all locations where the free drainage of water is blocked.
3.
Type and Manufacturer: _______.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
B.
Flashing for Concrete Facing Units:
1.
40-mil flexible flashing with integral drainage mat, stainless steel drip edge and weep tabs.
2.
Type and Manufacturer: _______.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
C.
Weep Vents for Concrete Facing Units:
1.
2-5/8 inches x 3-1/2 inches x 1/2 inches (67 mm x 89 mm x 13 mm) open-weave recycled polyester mesh.
2.
Weep Vents shall be installed a minimum of 32 inches (813 mm) O.C.
3.
Weep Vents color shall match color of the mortar joints.
4.
Type and Manufacturer: _______.
2.5
GROUT
 
** NOTE TO SPECIFIER ** Delete if not required.
 
A.
Conventional Grout:
1.
Shall conform to ASTM C 476 and the recommendations of NCMA TEK 9-4A.
2.
Grout shall be proportioned to provide slump of 8 to 11 inches as measured by ASTM C 143 / C 143M.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
B.
Self-consolidating Grout: Shall conform to ASTM C 476 and MSJC.
 
** NOTE TO SPECIFIER ** The same brand of water repellent admixture used in the block should be used in the mortar to ensure compatibility and bond.
 
2.6
MORTAR
 
** NOTE TO SPECIFIER ** Delete if not required.
 
A.
Mortar for Single-Wythe Concrete Units.
1.
Masonry Cement conforming to ASTM C 91, Type S.
2.
Cement - Lime.
a.
Portland Cement: ASTM C 150.
b.
Hydrated Lime ASTM C 207, Type S.
c.
Portland and Lime shall be mixed to meet ASTM C 270 property specification Type S.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
B.
Mortar for Concrete Facing Units:
1.
Masonry Cement conforming to ASTM C 91, Type N.
2.
Cement - Lime.
a.
Portland Cement: ASTM C 150
b.
Hydrated Lime ASTM C 207, Type S.
c.
Portland and Lime shall be mixed to meet ASTM C 270 property specification Type N.
 
** NOTE TO SPECIFIER ** Fill in blank below with custom color designation or delete line as applicable. Delete colors not required.
 
3.
Mortar Color: ____________.
4.
Mortar Color: Gray.
5.
Mortar Color: As indicated on Drawings.
 
** NOTE TO SPECIFIER ** Fill in blank below with designation for joint striking. Raked, flush, beaded, or extruded joints are not recommended as they do not compact the mortar and create ledges that intercept water running down the face of the wall. Delete mortar strike type not required.
 
6.
Joint Striking: __________.
7.
Joint Striking: Concave.
8.
Joint Striking: V-shaped.
9.
Joint Striking: As indicated on Drawings.
C.
Aggregate for Mortar: ASTM C 144.
 
** NOTE TO SPECIFIER ** Water repellents options are available for mortar and are specific to application requirements and desired results. Use of the water repellent in mortar must comply with all instructions provided by the water repellent manufacturer, and the water repellent method in mortar must be performed on a separate mock-up sample wall panel not less than 4 feet by 4 feet prior to approval. County Materials accepts no responsibility or liability for the use of water repellents in mortar used with our concrete masonry products.
 
D.
Water-Repellant Admixture: Liquid water-repellant mortar admixture or manufacturer approved equal. A complimentary water repellent mortar admixture used in the concrete masonry shall be used in the mortar to ensure compatibility and bond.
E.
Water: Clean and potable.
2.7
CONTROL JOINTS
 
** NOTE TO SPECIFIER ** Delete if not required.
 
A.
Control Joints shall be built into Single-Wythe Concrete Unit walls according to the recommendations of NCMA TEK 10-2C. Joints shall not exceed the lesser of: a maximum panel length to height ratio of 1-1/2:1 or a distance of 25 ft (7.6 m).
 
** NOTE TO SPECIFIER ** Delete if not required.
 
B.
Control Joints shall be built into Concrete Facing Unit walls according to the recommendations of NCMA TEK 10-4. Joints shall not exceed the lesser of: a maximum panel length to height ratio of 1-1/2:1 or a distance of 20 ft (6.1 m).
C.
Control Joint Gasket: 2-5/8 inch (67 mm) PVC compound with 80 Durometer hardness conforming to ASTM D 2240.
D.
Backer Rods: Backer rod diameter shall be 1/8 inch (3 mm) larger than width of the control joint.
1.
Closed-cell polyethylene foam complying to ASTM C 1330, Type C.
2.
Type and Manufacturer: _______.
E.
Sealant:
1.
Elastomeric polyurethane conforming to ASTM C 920.
2.
Sealant Depth at midpoint shall be minimum 1/4 inch (6 mm); maximum 3/8 (9.5 mm).
3.
Sealant color shall match color of Concrete Unit Masonry.
4.
Type and Manufacturer: _______.
2.8
SEALERS
A.
Sealer: Clear-drying, water-based, silicone emulsion with 6 percent solids as measured by ASTM D 5095.
B.
Sealer: Selected and confirmed during construction, as applicable after test area is prepared.
1.
Type and Manufacturer: _______.
2.9
CLEANERS
A.
Cleaners: Non muriatic acid cleaner.
B.
Sealer: Selected and confirmed during construction, as applicable after test area is prepared.
1.
Type and Manufacturer: _______.
PART 3 EXECUTION
 
3.1
EXAMINATION AND PREPARATION
A.
Examination:
1.
Verify field conditions are acceptable and ready to receive masonry.
2.
Verify the foundations or bearing elements are within tolerances conforming to the requirements of ACI 117.
3.
Verify built-in items are in proper location, and ready to receive masonry work.
4.
Verify Concrete Masonry Units are according to project specification and meet appropriate ASTM specification requirements. Commencement of installation constitutes acceptance of Concrete Masonry Units.
B.
Preparation: Prepare surfaces and materials in accordance with MSJC Specifications for Masonry Structures. If preparation is the responsibility of another installer, notify Architect in writing of deviations from manufacturer's recommended installation tolerances and conditions.
C.
Do not proceed with installation until substrates have been properly prepared and deviations from manufacturer's recommended tolerances are corrected. Commencement of installation constitutes acceptance of conditions.
3.2
INSTALLATION
A.
Install only quality units; reject all defective units. Align units level, plumb and true with uniform, carefully tooled 3/8 inch (9.5 mm) wide joints on the finished side of the wall. Draw blocks from two or more pallets at a time during installation. Provide adequate lighting for masonry work by placing all lighting a reasonable distance from the wall for even illumination. Do not use trough lighting. Make all unit cuts, including those for bonding, holes, boxes, etc., with motor-driven masonry saws, using either an abrasive or diamond blade. Cut neatly for best appearance.
B.
Concrete Masonry Units:
1.
Install concrete masonry units in accordance with standard masonry practices, and NCMA and MSJC Specifications for Masonry Structures and manufacturer's instructions.
 
** NOTE TO SPECIFIER ** Delete bond not required.
 
2.
Bond Pattern for Exposed Masonry: Running Bond.
3.
Bond Pattern for Exposed Masonry: Stacked Bond.
4.
Bond Pattern for Exposed Masonry: As indicated on Drawings.
5.
Lay units by selecting product from more than one pallet at a time during installation.
6.
Lay units with full mortar head and bed joints.
7.
All cutting shall be done with masonry saw to provide, clean, sharp, unchipped edges.
8.
Do not use masonry units with broken corners and edges in excess of ASTM C90.
9.
Temporary Formwork and Shores: Construct formwork to support reinforced masonry elements during construction.
10.
Provide temporary bracing during installation of masonry work. Maintain in place until building structure provides permanent bracing.
C.
Control Joints: Designed to reduce restraint and permit longitudinal movement. Per NCMA Tek Note 10-2C and 10-4, proper control joint spacing is required for concrete masonry walls.
1.
Single-Wythe Concrete Units: Joints shall not exceed the lesser of: a maximum panel length to height ration of 1-1/2:1 or a distance of 25 feet.
2.
Concrete Facing Units: Joints shall not exceed the lesser of: a maximum panel length to height ratio of 1-1/2:1 or a distance of 20 feet.
D.
Mortar and Mortar Joints:
1.
Mortar Mixing.
a.
Mix mortar ingredients in accordance with ASTM C270.
b.
Add mortar coloring.
c.
Add water repellent admixture specified by manufacturer.
d.
Mix mortar components between 3 and five minutes.
2.
Mortar Joints
a.
Tool exposed joints when mortar is thumbprint hard, using jointer larger than joint thickness.
b.
Remove excess mortar smears as work progresses.
3.
At installation completion of exposed concrete unit masonry, tuck-point holes and imperfections in joints of all exposed masonry surfaces, completely filling with mortar. Tool to match surrounding mortar joints. After pointing hardens, and within fourteen days of finished work, clean masonry surfaces of all excess mortar soiling and dirt
E.
Horizontal Joint Reinforcement:
1.
Place joint reinforcements in horizontal mortar joints in first course, at 8 inches above and below openings, and below bearing locations.
2.
Install joint reinforcement in the bed joints 16 inches (406 mm) on center vertically in veneer applications, in the exterior wythe of composite and noncomposite wall construction, and in through-wall masonry construction.
3.
Nonstructural, horizontal, joint reinforcement should not be installed continuously through control joints.
F.
Veneer Anchors and Ties: Install to allow for vertical and horizontal movement. Ties must be securely attached to studs through sheathing and/or insulation and not to the sheathing/insulation alone.
G.
Ambient Conditions: When ambient air temperature is outside the range of 40 to 90 degrees F (4.4 to 32.2 degrees C), implement procedures and comply with recommendations in accordance with MSJC Specification for Masonry Structures.
H.
During construction and until the walls are roofed, the coping is installed, or the top bond beam course is grouted solid, keep walls covered to prevent rain or snow intrusion into the Concrete Unit cores or wall cavities.
I.
Keep Concrete units and walls clean during construction. Prevent grout or mortar from staining the face of masonry. Mortar and grout soiling (droppings, spatters, and smears) shall be removed at the end of each day following standard masonry practices.
J.
Loading:
1.
Do not apply uniform floor or roof loads for a minimum of 12 hours after building masonry walls.
2.
Do not apply concentrated loading for a minimum of 3 days after building masonry walls or columns.
K.
Flashing and Weeps:
1.
Install flashing as indicated on drawings, as specified herein and in all of the following locations:
a.
Above grade at base of walls.
b.
Under and behind sills.
c.
Over openings.
d.
At spandrels and shelf angles.
e.
On top of bond-beams if used mid-wall.
2.
Weep Vents shall be provided at all flashing locations at intervals not to exceed 32 inches (813 mm) O.C.
L.
Contractor shall keep masonry units, walls and surrounding work clean during construction following standard masonry practices. Mortar soiling (including but not limited to droppings, splatters, smears) shall be removed at the end of each day. Remove mortar soiling from masonry work and connecting work before its final set. Mortar droppings that adhere to the exposed face of the units shall be removed using brick/block scrap after being allowed to harden, without causing damage to the exposed face of installed units. Remaining mortar shall be removed with a stiff fiber brush.
M.
All Concrete Masonry shall be cleaned in strict accordance with specified cleaning agent's instructions. Mild masonry detergents/cleaners and power washing systems shall be properly used. Strong acids, acid washes, or chemicals with a strong acid reaction shall not be used.
 
** NOTE TO SPECIFIER ** Concrete cleaning agents are not required but are an option for concrete masonry units. There are many different cleaning agents specific to application requirements and desired results. Use of the cleaning agent must comply with all instructions provided by the cleaning agent manufacturer, and the cleaning agent must be performed on a separate mock-up sample wall panel not less than 4 feet by 4 feet prior to approval. County Materials accepts no responsibility or liability for the use of cleaning agents on our concrete masonry units.
 
N.
Cleaning:
1.
All caulking and sealant materials shall be in place and cured prior to cleaning.
2.
Application of cleaner above 50 psi. is prohibited.
3.
A test panel shall be cleaned and approved by architect prior to general wall cleaning.
 
** NOTE TO SPECIFIER ** A field coat of sealer is recommended on County Materials' Premier Ultra Burnished Masonry Units. There are many different sealing agents specific to application requirements and desired results. Use of the sealing agent must comply with all instructions provided by the sealing agent manufacturer, and the sealing agent method must be performed on a separate mock-up sample wall panel not less than 4 feet by 4 feet prior to approval. County Materials accepts no responsibility or liability for the use of sealers on our Premier Ultra Burnished Masonry Units.
 
O.
Sealers:
1.
A test panel shall be cleaned and approved by architect prior to general wall cleaning.
3.3
PROTECTION
A.
Protection:
1.
Protect installed work from damage due to subsequent construction activity on the site.
2.
Protect masonry materials during storage and construction to prevent moisture intrusion and soilage.
3.
During erection, cover tops of walls to prevent moisture penetration into cores of Concrete Units and cavities of wall system.
4.
Provide final protection and maintain jobsite conditions that ensure Concrete Masonry is without damage, deterioration, or soiling.
END OF SECTION