Posted on : 16-09-2014 | By : Floor Mike | In : Gypcrete Repair
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.