INSULATING BARN FOUNDATION
QUESTION FROM KEVIN, BROOKLYN, MI
At the farm, I want to insulate the foundation walls of the barn. I was thinking about using one inch foam board, and the part above grade, would need to be covered with stucco (or something). I would like to get an estimate to have this done.
ANSWER FROM THE INSULATION DOCTOR:
We don't do that kind of work and I really don't know of anyone who does.
However, I would recommend that you could do it yourself by purchasing some 1" foil-backed Dow board (available at Home Depot or Lowes and comes in a 4x8 sheet -- runs about $16 a sheet). This is a closed-cell styrofoam.
You would put the foil to the outside and you can paint it prior to doing it if you wanted to. It is fairly weather-resistant.
Normally the method of installing it is to dig a trench around the foundation as deep as the foundation or a minimum of 12". Place the Dow board against the foundation and backfill with the dirt you originally removed to make the trench.
You might want to put some type of a cap (probably aluminum) on the open edge of the top to prevent it from picking up moisture such as rain.