Why do I have to trowel out a setting bed or support bed before placing PermaBase on the floor?
The purpose of troweling out a 1/4″ mortar bed or “support bed” is to provide a leveling agent for the plywood subfloor. Differences in height between pieces of plywood, whether it is from poor nailing, minor warping, floor joists, will affect the tile if not addressed. The best way to ensure a solid base for your tile application is to start with a plywood subfloor that does not exceed a 1/4″ of variance for every 10’ and to apply a 1/4″ notched trowel bed of mortar in which the PermaBase is then set and then nailed or screwed.
