How to insulate a garage floor with plywood and foam.

If you are going to convert your garage to a living space, it is a good idea to insulate the concrete floor first.If you plan to use the garage as a workshop, you might want to insulate the floor.It is possible to make a garage more comfortable to work in during cold weather with an insulated floor.

There are two ways to clean concrete floors.Attach wood sleepers to the floor, fill the gaps with rigid foam insulation, and then apply finish flooring.You can cover the slab with rigid-foam insulation, add two layers of plywood, and then add the finish flooring.

Either approach requires you to adequately prepare the slab before you start.It should be flat and free of excess water.Problems should be addressed before the insulation is done.

When a flooring material is laid over concrete, it is important to control the amount of water in the concrete.Although it looks like solid rock, concrete is porous and can affect any surface material laid over it.Even if the garage will continue to be a vehicle-storage space, it's important to control the amount of water in the room.

To control the amount of humidity in a garage, plywood sheets are laid over the foam panels and a sheet of plastic is used as a vapor barrier.Before the slab is poured, the vapor barrier is usually laid down.The vapor barrier is laid over the top of the slab before the foam panels are installed.

The foam insulation and two layers of plywood can add up to 2 inches to the garage floor.This can be a problem if the garage will be used to store vehicles, since it leaves you with a raised lip at the doorway.The transition can be smooth with a variety of edging strips or thresholds.Transition thresholds that fit the height of your insulated garage floor should be checked with the manufacturers of garage flooring tiles.

Insulating concrete garage floors begin with covering the entire floor with 6-mil polyethylene, which will serve as a vapor barrier.Seal the seams with waterproof construction tape by overlaping them.Run the polyethylene up the sides of the walls and secure them with construction tape.