What rigid foam board means
Rigid foam board is insulation sold in sheets of expanded polystyrene, extruded polystyrene or polyisocyanurate. It is used on foundations, under slabs and as continuous insulation on walls.
Also called EPS, XPS, polyiso, foam board.
Where it matters on a insulation job
The three types differ in R-value per inch, moisture resistance and price, so name the type on the estimate. Exposed foam inside a house generally needs a thermal barrier over it.
What it costs
Koira's basement finishing cost guide puts a typical job at $23,000, with most between $12,000 to $34,500. The guide shows its sources and what moves the price. The insulation cost calculator prices a job line by line.
Work it out
- Free calculator: Insulation cost calculator
- Cost guide: Basement finishing cost
- Tools, templates and guides: Free insulation resources