What is the proper construction of plywood floors and what do I use to install tile over exterior glue plywood floors?
The total plywood thickness must be a minimum of 1 1/4″ (32mm) thick. The subfloor (bottom layer) must be tongue and groove. Either 3/4″ (19mm) thick or 5/8″ (16mm). For the 3/4″ (19mm) subfloor, use a minimum of 1/2″ (12mm) underlayment. For the 5/8″ (16mm) subfloor, use a minimum of 5/8″ (16mm) underlayment. The subfloor and underlayment sheets must be installed perpendicular to the joists. Leave an 1/8″ (3mm) gap between the sheets. You must use and exterior glue type of plywood (CDX) for the underlayment. Douglas fir will provide the best results. See LATICRETE Technical Data Sheet (TDS) 152 “Bonding Ceramic Tile, Stone or Brick Over Wood Floors” for more information on other types of suitable underlayments. The plywood must be fastened every 6″ (150mm) at the perimeter and every 8″ (200mm) in the field. Wafer head galvanized screws provide the best results. The floor joists must be no farther apart than 16″ (400mm) on center. They must be a minimum of 2″ x 10″ in size (50mm X 250m
Related Questions
- Hi David, you can use an exterior grade thin set for tile. Another option would be an exterior glue like Liquid Nail. Liquid Nail makes several glues for stone in exterior applications. I hope this information helps feel free to write again regarding this or other matters, sincerely bruce e johnson.
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