Lay 6 mil polyethylene sheeting over the concrete to minimize moisture migration from the concrete up into the wood flooring.
How to insulate a raised floor over concrete.
The foam insulation and two layers of plywood can add as much as 2 inches of height to the garage floor.
Determine the height of the false floor in relation to the bottom step of the basement stairs.
If the concrete floor is dry and reasonably level insulate directly on top with a rigid foam insulation that is impervious to moisture air leakage and radon gas.
Treated plywood to the concrete with concrete screws spaced every 16 in.
If you are installing insulation on a pre built shed you cannot simply drill a hole in the floor and pump it full of spray foam.
One of the drawbacks for spray foam is that you need backing for it to adhere to the surface.
Insulating a concrete floor can save you money on your heating bill making an attached garage or basement warmer and by extension the rest of your house.
Dealing with the edges.
Floated subfloor alternate subfloor glue down sub floor and the nail down subfloor system.
Get a comprehensive breakdown on which materials to use what to take into consideration and what steps to take for four subfloor systems.
In addition to offering insulation and energy savings the plywood subfloor described here can provide the perfect foundation for finish flooring such as carpeting adding warmth in look as.
Building a framed wood floor over an existing concrete slab can provide the space needed for electric wiring heat venting plumbing drain lines and added insulation when remodeling a basement or garage space.
Alternatively screw rows of treated 1x4s to the concrete 16 in.
Is an effective but more expensive solution for floor insulation in your shed.
If the basement floor is wet hire a professional find the source of the problem and fix it before doing anything.
This can be a problem if the garage will continue to be used to store vehicles since it leaves you with a substantially raised lip at the doorway to the garage.