See Maxxon Corporation's (Gyp-Crete) recommended specifications for various remodelling situations: old hardwood floors, Vinyl Asbestos Tile encapsulation, removed lightweight concrete fill, installation of sound-deadening board, etc.

SECTION 03650 — GYPSUM CONCRETE FLOOR UNDERLAYMENT


PART 1 — GENERAL

1.01 DESCRIPTION

Extent of gypsum concrete work is to provide underlayment for
Describe to suit project…

1.02 QUALIFICATIONS

Allow installation of gypsum concrete floor underlayment only by a qualified applicator with a minimum of 2 years of experience, approved by the manufacturer of the product and using equipment and procedures recommended by the manufacturer.

1.03 CONDITIONS

Install gypsum concrete floor underlayment only after building has been enclosed and building temperature has been maintained at 50º F for a period of time sufficient for the structure and subfloor temperature to stabilize.

Provide ventilation as necessary to remove moisture from the area of installation until the gypsum concrete floor underlayment is cured.

1.04 DELIVERY, STORAGE & HANDLING

Deliver materials delivered in their original, unopened packages, and protect from exposure to the elements. Remove damaged or deteriorated materials from the premises.


PART 2 — PRODUCTS

2.01 GYPSUM CONCRETE FLOOR UNDERLAYMENT

Cast-in-place gypsum concrete, 3/4" thickness minimum, with 3,000 psi compressive strength, and a dry density of 115 lbs/cu. ft. minimum. Use mix design in strict accordance with product manufacturer's recommendations.

Manufacturer: Maxxon Corporation, 920 Hamel Road, Hamel MN 55340, 1-800-356-7887

2.02 PRIMER

Use primer at subfloor only as approved by manufacturer of gypsum concrete floor underlayment for the purpose intended and conditions present.


PART 3 — EXECUTION

3.01 INSTALLATION

Inspect area of installation for proper nailing and condition of subfloor. Replace damaged areas with new plywood to match. Install gypsum concrete floor underlayment only after gypsum wallboard has been installed.

Mix gypsum concrete strictly in accordance with manufacturer's recommendations for type of placement operation employed. Keep mixing and placement equipment clean and free of hardened lumps of gypsum concrete.

Do not interrupt placement until entire panels or sections are completed. Place material in one layer, using techniques so as to minimize formboard deflection, impact, spattering supporting structures, and staining underside of formboards.

Immediately after placement, screed and level to required thickness and trowel smooth to an even plane. Provide adequate underside ventilation and heat, if necessary before, during and after placement to insure complete drying of gypsum concrete. Promptly clean spatter from exposed walls and supporting structures before it sets.

Scrape rough areas smooth and patch uneven areas with fresh gypsum concrete slurry after underlayment has set.

3.02 PROTECTION

Protect gypsum concrete floor underlayment from foot or wheeled traffic and do not allow installation of finish flooring materials until the underlayment has thoroughly cured. Provide temporary planking over sections that will receive heavy traffic or concentrated loads.


END OF SECTION 03510

GYPSUM CONCRETE FLOOR UNDERLAYMENT 03650-#
courtesy of Design Coalition, Architects. , Madison, Wisconsin, USA ~~ www.designcoalition.org