Extruded polystyrene foam xps also known as blue board or pink board comes in many different thicknesses and edge profiles.
Exposed foam board insulation.
For new construction use rigid boards to insulate slabs and the outside of foundation walls.
The problem with that application has always been that the foam board needed to be covered with a thermal barrier or flame spread barrier like drywall in order to meet local fire codes.
This insulation board is probably one of the most widely used foam board insulation products in the residential construction industry.
Compare click to add item r 3 expanded polystyrene foam board insulation 3 4 x 14 1 2 x 48 6 pk to the compare list.
Polyisocyanurate is another option coming in as the densest and more expensive option for foam board.
Owens corning foamular 250 extruded polystyrene xps rigid foam insulation is a closed cell highly moisture resistant rigid foam board well suited to meet the needs for a wide variety of residential and commercial construction applications.
Use a premade kit for this type of project.
Click to add item r 3 expanded polystyrene foam board insulation 3 4 x 14 1 2 x 48 6 pk to the compare list.
As already noted a decent thickness of extruded foam insulation may create a pretty good air vapour barrier especially when covered with taped and painted drywall.
Foamular 250 product data sheet pdf v 1593673075000 1 45 mb.
If warm moist house air.
Shop at lowe s to find the foam sheeting you need for your next insulation project.
For a basement remodeling project consider insulating basement walls with foam board.
Typically sold as sheet insulation in a standard size of 4 x 8 foam insulation panels can help reduce energy costs get a handle on moisture control and more.
Xps has an r value of 4 5 to 5 0 per inch of thickness.
Those are all viable options but perhaps the most sought after option is to insulate with foam board on the inside of the foundation wall so you don t have to worry about the above grade exposure.
As far as i know most types of rigid foam insulation can t be left exposed but need to be covered with a layer of drywall for fire resistance.
Attach the tongue and groove insulation boards to the concrete wall with adhesive.