Thanks to all ideas best magi the walls have since.
Insulated plywood flooring.
It is on a hill so the back is very close to the ground too low to get under to insulate from the outside.
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.
The foam insulation and two layers of plywood can add as much as 2 inches of height to the garage floor.
3 multiply the total inches of insulation by 3 2 to estimate the existing r value of your floor.
Thermaldry insulated floor decking is made from an inorganic magnesium oxide board.
Dealing with the edges.
I d love some suggestions on how to insulate the floor from the inside.
1 of high performance foam insulation helps keep floors warm and free of condensation.
If hvac ducts are routed through the floor assembly the floor joists must be deep enough to install several inches of insulation under the ducts.
Improved energy efficiency the panels are available in r5 r7 r9 and r11 increasing the overall r value of your home reducing heat loss and lowering utility bills.
Inspect your floor framing and measure the thickness of the existing insulation if any.
Insulate ducts and plumbing and put them close to the floor.
We now only make an r7 energy saver rated product 2 1 quot.
Firstly we no longer manufacture the r5 amdry insulated subfloor panels.
X 2 x 4 amd0150g this product can yes be installed in your barn and yes it can and should be installed over the entire floor area and walls built on top as long as they are not load bearing.
A floor with ducts also should be insulated with a continuous layer of thick rigid foam under the floor joists.
I m turning my 130 square foot tool shed into a small livable room and the floor is plywood on floor joists.