GYPSUM CEMENTITIOUS UNDERLAYMENT
RECOMMENDED SPECIFICATION FOR RAPID FLOOR® PLUS UNDERLAYMENT OVER ACOUSTI-MAT® II SOUND DEADENING PAD IN HARD SURFACE AREAS IN MULTIFAMILY HOUSING
PART 1 GENERAL
1.01 SUMMARY
A. This is the recommended specification for Rapid Floor Plus Underlayment over Acousti-Mat II sound deadening pad in hard surface areas in multifamily housing.
1.02 SECTION INCLUDES
A. Rapid Floor Plus Gypsum Cement
B. Acousti-Mat II
C. Manufacturer Approved Floor Primer
D. Manufacturer Approved Sealer
1.03 QUALITY ASSURANCE
A. Rapid Floor Plus Installer's Qualifications: Installation of Rapid Floor Plus shall be by an applicator authorized by Rapid Floor Systems using approved mixing and pumping equipment.
B. Acousti-Mat II Installer's Qualifications: Installation of Acousti-Mat II shall be by an applicator authorized by the Maxxon Corporation.
1.04 DELIVERY, STORAGE AND HANDLING
A. General Requirements: Materials shall be delivered in their original, unopened packages, and protected from exposure to the elements. Damaged or deteriorated materials shall be removed from the premises.
1.05 SITE CONDITIONS
A. Environmental Requirements: Before, during and after installation of Rapid Floor Plus and Acousti-Mat II, building interior shall be enclosed and maintained at a temperature above 50 degrees F (10 degrees C).
PART 2 PRODUCTS
2.01 MATERIALS
A. Gypsum Cement: Floor underlayment Rapid Floor Plus gypsum cement as manufactured by Rapid Floor Systems, Hamel, MN. All others must receive prior approval.
B. Sound Deadening Pad: Acousti-Mat II as manufactured by the Maxxon Corporation, Hamel, MN.
C. Sand Aggregate: Sand shall be 1/8 inch (3 mm) or less, washed masonry or plaster sand, meeting requirements of Rapid Floor Systems Sand Specifications 101.
D. Mix Water: Potable, free from impurities
E. Subfloor Primer: Manufacturer Approved Primer
F. Sealer: Manufacturer Approved Sealer
2.02 MIX DESIGNS
A. General Requirements: Mix proportions and methods shall be in strict accordance with product manufacturer recommendations.
PART 3 EXECUTION
3.01 PREPARATION
A. Condition and Cleaning of Subfloor: Subfloor shall be structurally sound. General Contractor shall clean subfloor to remove mud, oil, grease, and other contaminating factors before the arrival of the Rapid Floor Plus crew.
B. Leak Prevention: Fill cracks and voids with a quick setting patching or caulking material where leakage of Rapid Floor Plus could occur.
C. Expansion Joints: Allow joints to continue through the Rapid Floor Plus at the same width.
D. Transition Areas: The general contractor shall install bulk heads in all the areas where the Acousti-Mat II system stops and meets the carpet and pad areas. The height of the bulk head will depend on the total thickness of the Rapid Floor Plus and Acousti-Mat II. The typical height of the bulk heads will be 1 1/4" (31 mm).
3.02 APPLICATION OF ACOUSTI-MAT II
A. Acousti-Mat II Installations: Install Acousti-Mat II following manufacturers recommendations and specifications.
3.03 APPLICATION OF CEMENTITIOUS FLOORING
A. Scheduling: Application of Rapid Floor Plus shall not begin until the building is enclosed, including roof, windows, doors and other fenestration. Install after drywall installation unless tenant finish requirements identify partitioning after the pour. If Acousti-Mat II is to be installed before drywall, then 3.4 lb. sq. yd. galvanized metal lath must be loose laid over the entire Acousti-Mat II surface. Schedule the Acousti-Mat II sound control system as late as possible in the construction cycle.
B. Priming Acousti-Mat II: Prime Acousti-Mat II using Manufacturer Approved Primer to bond the Rapid Floor Plus to the pad.
C. Application: Place Rapid Floor Plus a minimum 1 inch (25 mm) thick, over loosely laid Acousti-Mat II. Place Rapid Floor Plus at 3/4" (19 mm) over the subfloor in all carpet and pad areas. Spread and screed Rapid Floor Plus to a smooth surface.
D. Drying: General Contractor shall provide continuous ventilation and adequate heat to rapidly remove moisture from the area until the Rapid Floor Plus is dry. General Contractor shall provide mechanical ventilation if necessary. Under the above conditions, for 1 inch thick Rapid Floor Plus, 7-10 days is usually adequate drying time. To test for dryness, tape a 24 inch by 24 inch (609 mm by 609 mm) section of plastic or a high density rubber mat to the surface of the underlayment. After 48-72 hours, if no condensation occurs, the underlayment shall be considered dry. Perform dryness test 5-7 days after pour.
3.04 PREPARATION FOR INSTALLATION OF GLUE DOWN FLOOR GOODS
A. Sealing: Seal all areas that receive glue down floor goods with Manufacturer Approved Sealer according to the Rapid Floor Systems specifications. Any floor areas where the surface has been damaged shall be cleaned and sealed regardless of floor covering to be used. Where floor goods manufacturers require special adhesive or installation systems, their requirements supersede these recommendations.
B. Floor Goods Procedures: See the brochure "Procedures for Attaching Finished Floor Goods" for guidelines for installing finished floor goods. This procedure is not a warranty and is to be used as a guideline only.
3.05 FIELD QUALITY CONTROL
A. Slump Test: Rapid Floor Plus mix shall be tested for slump as it's being pumped using a 2 inch by 4 inch (50 mm by 101 mm) cylinder resulting in a patty size of 8 inches (203 mm) plus or minus 1 inch (25 mm) diameter.
B. Field Samples: At least one set of 3 molded cube samples shall be taken from each day's pour during the Rapid Floor Plus application. Cubes shall be tested as recommended by the Rapid Floor Systems in accordance with modified ASTM C 472. Test results shall be available to architect and/or contractor upon request from applicator.
3.06 PROTECTION
A. Protection From Heavy Loads: During construction, place temporary wood planking over Rapid Floor Plus wherever it will be subject to heavy wheeled or concentrated loads.
END OF SECTION
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