PROCEDURES

1.  Remove floor covering over broken-up areas.

2.  To help keep dust to a minimum, wet area to be removed with water at approximately 2 gal. (7.57L) per sheet of plywood. Let soak for 10-12 minutes, then remove broken Maxxon Underlayment.

CAUTION: Hammering or pounding out the gypsum product can cause it to lose bond far beyond the broken area.

If dust is not a problem, a circular saw with a masonry blade may be used to cut the perimeter of the underlayment to be removed. Set blade depth 1/32″ (.79 mm) deeper than the gypsum underlayment.

3.  Inspect the plywood, either remove and replace, or reinforce plywood subfloor. Replace plywood if delaminated or if broken plies exist.

Optional: To reinforce, staple or nail galvanized diamond metal lath.

4.  Spray or brush the Floor Primer over the plywood at the rate of 300 ft2 /gal.. (27.87m2/L)

5.  Mix and pour out the gypsum underlayment mix onto the plywood, float or trowel to a smooth surface to meet the existing gypsum underlayment height.

6.  Material should set within a few hours.

7.  The gypsum underlayment must be completely dry before replacing floor goods.

Gypcrete Surface Preparation:  

All wood subfloors must be structurally sound, thoroughly clean (use vacuum or broom), dry, and free from mud, wax, grease, oil and other contaminants and fill cracks with a crack filler. Gypcrete will not correct or compensate for a structurally defective substrate. If there is any movement in your wood floor that may cause concern about bonding of the Gypcrete to the subfloor material, staple 2.5 pound metal lath to floor as reinforcement prior to pouring Gypcrete.

D u r a – C a p ® F l o o r Underlayment (commonly known as “Gypcrete”) is a nonstructural gypsum concrete used with aggregates in pouring crack resistant, fire resistant and sound-insulating floors. Batch mixed on the job, barrel mixed or pumped into place by authorized applicators, it is ideal over veneer and non-veneer wood subfloor panels, precast concrete and cast-in-place concrete. With proper preparation, Dura-Cap® Floor Underlayment (Gypcrete) can accept virtually any type of flooring material.