INCLUDE IN 04220 Concrete Masonry Units

PART 1 - GENERAL

1.01 Section Includes

A. Concrete unit masonry, including ground face units (Burnished Masonry Units) where indicated . . .

1.02 Related Sections

A. Section 07190 - Water Repellents

1.03 References

A. ASTM C90 - Hollow Load Bearing Concrete Masonry Units

1.04 Submittals

A. Samples for initial selection of ground face masonry units from manufacturer's standard colors.

B. Full-size units as samples for verification of ground face masonry units selected.

C. Material certificates for ground face units, signed by manufacturer, certifying that ground face units comply with the requirements.

D. Submit manufacturer's product literature for each ground face color selected.

E. Material test reports from a qualified independent testing agency, indicating and interpreting test results relative to compliance of ground face units with requirements indicated.

F. Qualification data for manufacturer of ground face units specified in the "Quality Assurance" Article to demonstrate their capabilities and experience. Include lists of completed projects with project names and addresses, names and addresses of architects and owners.

1.05 Quality Assurance

A. Manufacturer Qualifications: The ground face concrete masonry manufacturer shall have a minimum of five years experience manufacturing and grinding ground face CMU at their current facility.

B. Preconstruction Testing: Employ and pay a qualified independent testing agency to test ground face units for strength, absorption, and moisture content per ASTM C140.

C. Single-Source Responsibility: Obtain ground face concrete masonry units from one source and by a single manufacturer for each color required.

D. Mockup: Prior to installing ground face concrete unit masonry, construct 4' x 4' sample wall panels of ground face concrete masonry, including an application of FBP-707 Ground-Face Concrete Masonry Acrylic Sealer to verify selections made under sample submittals, and to demonstrate aesthetic effects of materials and execution using materials indicated for final unit of work.

E. All ground face concrete masonry units shall be factory-ground. Units not ground in the factory will not be acceptable.

F. Ground face concrete masonry units shall specifically conform to paragraph 7.3.1 of ASTM C90 with regard to imperfections (chips and cracks).

1.06 Delivery, Storage and Handling

A. Ground face concrete masonry units shall be delivered to the jobsite banded on wood pallets with protective cardboard between layers of units.

B. Store ground face concrete masonry units on elevated platforms, under waterproof cover, and in a dry location to prevent their deterioration or damage due to moisture, temperature changes, contaminants, corrosion, and other causes. If units become wet, do not install until they are in an air-dried condition.

C. Handle ground face concrete masonry units with extreme care to avoid chippage and breakage.

PART 2 - PRODUCTS

2.01 Ground Face Concrete Masonry Units

A. Ground face concrete masonry units shall be made from natural and manufactured aggregates, cement and color. All of these materials are derived from nature and will vary in uniformity of size, shape, texture and particle color. The manufacturer shall exercise extreme care in the manufacturing process to minimize these variations in size, shape, texture and particle color so that the completed product will match the "Basis of Design" approved samples and mockup. The manufacturer shall use the finest materials available, but some variation in color and texture will be acceptable to the extent the approved samples and mockup exhibit variation. Edge and corner chips will be acceptable to the extent ASTMC90, paragraph 7.3.1 allows chips and cracks.

B. Basis of Design: Provide Burnished Masonry Units as manufactured by Featherlite Building Products Corporation, 508 McNeil Road, Round Rock, Texas 78681 (512) 255-2573.

1. All ground faces shall have a factory-applied sacrificial coating of clear, unpigmented, VOC-compliant acrylic sealer.
2. Provide special shapes for lintels, corners, jambs, sash, control joints, headers, bonding, and other special conditions.
3. Provide bullnose/square-edged units for outside corners.
4. All ground face units shall be manufactured with integral water repellent "Dry Block" as manufactured by W.R. Grace & Company.
5. Comply with ASTM C90 and as follows:
   a. Unit compressive strength: 1900 psi
   b. Weight classification: light/medium weight
   c. Type: Type I, moisture-controlled units.
   d. Size: Manufactured to the actual/nominal dimensions indicated on drawings within tolerances specified in ASTM C90, except bed depth dimension on single-face units shall be 1/16-inch less than ASTM C90 and double-face units shall be 1/8-inch less
   e. Finish: Exposed faces of ground face units matching color, pattern, and texture of architect's submittal selection
C. Ground Face Concrete Masonry Cleaner: Clean ground face masonry using Burnished Custom Masonry Cleaner as manufactured by ProSoCo, Inc., or architect-approved equal.

PART 3 - EXECUTION

A. Lay ground face units only when lighting is adequately illuminated.

B. Cut all ground face units with a motor-driven saw, using diamond or abrasive blades.

C. Take ground face units from multiple pallets for blending.

D. Align ground face units level, plumb and true with uniform concave tooled 3/8-inch-wide joints. Scored units shall be tuckpointed and tooled with a concave jointer to match head and bed joints.

E. All exterior ground face units shall be laid using mortar with integral water repellent admixture "Dry-Block Admixture" at the rate recommended by W.R. Grace & Company.

F. Flashing, Weep Holes and Control Joints: Install flashing, weep holes and control joints as specified herein and indicated on the drawings.

G. Cover walls each day after installation to keep open wall protected and dry.

H. During installation, keep ground face masonry units clean daily using brushes, burlap, etc.

1. No high pressure spray (power wash) cleaning methods shall be used.

Please Note: The initial factory applied coating is a part of the coating system. During the cleaning process, some or all of the initial coating will be stripped from aggressive scrubbing and/or misuse of acidic cleaners. The result will be an uneven appearance in color and sheen. Adhering to the following field coat products and specifications will ensure the desired results.

INCLUDE IN Division 7 Water Repellents

PART 2 - PRODUCTS

2.01 Water Repellents

A. Ground Face Concrete Masonry Water Repellent Protection (Field Applied): WRP-700 as distributed by Featherlite Building Products Corporation, 508 McNeil Road, Round Rock, Texas 78681, (512) 255-2573

B. Ground Face Concrete Masonry Acrylic Sealer (Field Applied): FBP-707 as distributed by Featherlite Building Products Corporation, 508 McNeil Road, Round Rock, Texas 78681, (512) 255-2573.

3.01 Field Coat Application

A. Interior/Exterior Locations: Water-Repellent Protection
1. After the final clean down when the walls are dry, apply ground face concrete masonry water repellent protection, WRP-700, as specified herein to all walls laid with ground face concrete masonry units with one flood coat using an industrial pump sprayer.
2. After water repellent protection has cured as recommended by manufacturer, apply one coat of FBP-707 Ground Face Concrete Masonry Acrylic Sealer evenly as specified herein without runs or drips, using airless spray equipment.

B. Interior/Exterior Locations: Non-Water-Repellent Protection
1. After the final clean down when the walls are dry, apply a jobsite application of Ground Face Concrete Masonry Acrylic Sealer, FBP-707, as specified herein to all walls with ground face units.
2. Apply one coat evenly without runs or drips, using airless spray equipment.

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