In older homes it is good practice to apply a concrete sealer to block moisture or install a vapor barrier on the concrete floor prior to installing the InSoFast panels.
If you have new construction with a vapor barrier already installed underneath the concrete slab, it is not necessary to put another vapor barrier on top of the concrete floor.
Install the InSoFast panels on the wall first. This minimizes the chance of water getting on top of the subflooring in the event the wall leaks.
There are four basic installation methods: floating, glue down, screwed down, and fully adhered. The floating method is recommended for carpet, laminate, and wood floors. This is a simpler, quicker installation that makes the concrete floor feel softer and more comfortable. The glue down method can be used for carpet, laminate, and wood floors. The screw down method can be used for any flooring type. The fully adhered method is recommended for tiled area to create a solid base that eliminates movement.
The floating method places the panels directly on the concrete without any adhesive. Interlock the panels together with the tongue and grooved edges in a running bond or staggered pattern.
The glue down method bonds the panels in place with a 3/8″ bead of PL Premium 3X Stronger Construction Adhesive along dove-tailed ribbing of each stud. One 28 oz. tube covers 50 s.f.
Attach InSoFast panels to the concrete floor by installing concrete screws through the studs.
For tile applications, the InSoFast panels are set in a bed of thinset tile adhesive with a notched trowel per manufacturer’s instructions.
Install InSoFast panels up to existing interior partition walls. Non-bearing interior partition walls can be framed directly on top of the subfloor with no need for a treated bottom plate.
Install subflooring with a gap for expansion following per manufacturer’s instructions. Fasten with standard coarse thread all-purpose construction screws.
When panels are installed as a floating floor, it is important to layout the subflooring so that the long seam of the plywood does not line up with the seams in the InSoFast panels. The short seams of the plywood should land over the top of a stud.
Prior to installing panels, the low spots can be filled in with concrete patch or concrete floor leveler.
If you notice an area with excessive deflection after the subflooring has been installed, fill the void with adhesive or spray foam. Simply drill a hole through the subflooring and panel down to the void and inject PL Premium Construction Adhesive 3X or gap and crack spray foam. Using too much spray foam will cause a bulge in the floor. Avoid walking on this area until the adhesive or spray foam has set.