Rapid Floor in Multifamily with Rapid Floor Ultra in Hard Surfaced Areas

GYPSUM CEMENTITIOUS UNDERLAYMENT

RECOMMENDED SPECIFICATION FOR RAPID FLOOR^® UNDERLAYMENT IN MULTIFAMILY HOUSING (RAPID FLOOR^® ULTRA IN HARD SURFACED AREAS)

PART 1 GENERAL

1.01 SUMMARY

A. This is the recommended specification for Rapid Floor^® Underlayment in multifamily housing (Rapid Floor^® Ultra in hard surfaced areas).

1.02 SECTION INCLUDES

A. Rapid Floor Gypsum Cement

B. Rapid Floor Ultra Underlayment

C. Manufacturer Approved Floor Primer

D. Manufacturer Approved Sealer

1.03 QUALITY ASSURANCE

A. Installer's Qualifications: Installation of Rapid Floor and Rapid Floor Ultra shall be by an applicator authorized by the 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 underlayments, 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 and Rapid Floor Ultra gypsum cement as manufactured by the 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 Specifications 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: 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 underlayment crew.

B. Leak Prevention: Fill cracks and voids with a quick setting patching or caulking material where leakage of underlayment could occur.

C. Priming Subfloor: Prime the subfloor using the Manufacturer Approved Primer. Priming instructions may vary according to the porosity of the substrate, multiple coats may be necessary over porous plank or concrete.

D. Expansion Joints: Allow joints to continue through the underlayments at the same width.

3.02 APPLICATION OF CEMENTITIOUS FLOORING

A. Scheduling: Application of Rapid Floor and Rapid Floor Ultra shall not begin until the building is enclosed, including roof, windows, doors and other fenestration. Schedule application of underlayments after installation of gypsum board work.

B. Application: Place Rapid Floor and Rapid Floor Ultra at 3/4 inch (19 mm) minimum over wood frame, 1/2 inch (13 mm) minimum over plank or poured in place concrete. Spread and screed underlayments to a smooth surface. Except at authorized joints, place Rapid Floor as continuously as possible until application is complete so that no Rapid Floor product slurry is placed against Rapid Floor product that has obtained its initial set.

C. Drying: General Contractor shall provide continuous ventilation and adequate heat to rapidly remove moisture from the area until the Rapid Floor product is dry. General Contractor shall provide mechanical ventilation if necessary. Under the above conditions, for 3/4 inch (19 mm) thick Rapid Floor, 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 Attachment: 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: Rapid Floor and Rapid Floor Ultra 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 product 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.

3.05 PROTECTION

A. Protection From Heavy Loads: During construction, place temporary wood planking over Rapid Floor products wherever it will be subject to heavy wheeled or concentrated loads.

END OF SECTION