GYPSUM CEMENTITIOUS UNDERLAYMENT
RECOMMENDED SPECIFICATION FOR COMMERCIAL TOPPING® FLOOR UNDERLAYMENT FOR TOPPING CONCRETE FLOORS
PART 1 GENERAL
1.01 SUMMARY
A. This is the recommended specification for Commercial Topping Floor Underlayment for topping concrete floors.
1.02 SECTION INCLUDES
A. Commercial Topping floor underlayment
B. Manufacturer Approved Primer
C. Manufacturer Approved Sealer
1.03 QUALITY ASSURANCE
A. Commercial Topping Installer's Qualifications: Installation of Commercial Topping shall be by an applicator authorized by Rapid Floor Systems using approved mixing and pumping equipment.
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 Commercial Topping, building interior shall be enclosed and maintained at a temperature above 50 degrees F (10 degrees C).
PART 2 PRODUCTS
2.01 MATERIALS
A. Floor Underlayment: Commercial Topping gypsum cement as manufactured by Rapid Floor Systems, Hamel, MN. All others must receive prior approval.
B. Sand Aggregate: Sand shall be 1/8 inch (3 mm) or less, washed masonry or plaster sand, meeting requirements of Rapid Floor Systems Sand Specification 101.
C. Mix Water: Potable, free from impurities.
D. Subfloor Primer: Manufacturer Approved Primer
E. Sealer: Manufacturer Approved Sealer
2.02 MIX DESIGNS
A. General Requirements: Commercial Topping 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 arrival of the Commercial Topping underlayment crew.
B. Leak Prevention: Fill cracks and voids with a quick setting patching or caulking material where leakage of Commercial Topping could occur.
C. Priming Subfloor: Prime concrete subfloor using the Manufacturer Approved Primer. Priming instructions vary according to the porosity of the concrete, multiple coats may be necessary.
D. Expansion Joints: Allow joints to continue through the Commercial Topping at the same width.
3.02 APPLICATION OF CEMENTITIOUS FLOORING
A. Scheduling: Application of Commercial Topping 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.
B. Application: Place Commercial Topping at 3/8 inch (10 mm) minimum over concrete. Spread and screed Commercial Topping to a smooth surface. Except at authorized joints, place Commercial Topping as continuously as possible until application is complete so that no Commercial Topping slurry is placed against Commercial Topping product that has obtained its initial set. Featheredging may be accomplished in low traffic areas.
C. Drying: General Contractor shall provide continuous ventilation and adequate heat to rapidly remove moisture from the area until the Commercial Topping is dry. General Contractor shall provide mechanical ventilation if necessary. Under the above conditions, for ¾ inch (19 mm) thick Commercial Topping, 5 -7 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 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.
3.03 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.
3.04 FIELD QUALITY CONTROL
A. Slump Test: Commercial Topping 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 9 inches (228 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 Commercial Topping application. Cubes shall be tested as recommended by Rapid Floor Systems in accordance with modified ASTM C 472. Test results shall be available to architect and/or contractor upon request from applicator.
3.05 PROTECTION
A. Protection From Heavy Loads: During construction, place temporary wood planking over Commercial Topping wherever it will be subject to heavy wheeled or concentrated loads.
END OF SECTION
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