Hi all,

I’m looking for recommendations on the best material (and recommended thickness) to use to insulate an existing concrete slab floor (no basement). We are replacing the carpet on the main floor of our hundred year old coach house with engineered hardwood. The house is open concept with high ceilings, and if there is material benefit, we could add a few inches of height to the floor in the form of insulation.

We live in Toronto, Canada and our goal is to make the house more comfortable in winter (it is drafty and leaky) and improve energy efficiency. We are in the process of other improvements such as fixing the air leaks, duct leaks, weather proofing, replacing windows with triple panes from Duxton (we could not salvage the originals) and insulating walls.

I’d appreciate any suggestions and would be happy to provide further details.

Thank you,
Jess