They cost an average of $10 to $12 per square foot ... The material used for the rigid insulation board will affect the R-Value as well as the cost; the higher the R-Value, the higher the cost ...

Knowing how to insulate an attic while leaving adequate clearance can be tricky. That's because insulating it to the proper R-value can cause a dramatic loss of headroom if you limit yourself to ...

DEAR TIM: I am currently installing rigid foam insulation around the exterior of my foundation. I’m installing three inches of it to a depth of 10 to 13 inches below grade to keep the heat in ...