Rigid Foam Board Roof Insulation

If you want to install rigid foam above your roof sheathing in climate zone 3 then 1 2 inch of rigid foam board is not ideal this rigid foam layer needs a minimum r value of r 5 and that s impossible with 1 2 inch of foam.

Rigid foam board roof insulation.

In other words rigid foam can be applied on walls foundations and roofs and works great for both retrofits and new constructions. Not only does it provide high r values but foam board insulation is also easy to install lightweight and can be used in any room of your home. As my article states you need a minimum of about 1 5 inch of eps 1 inch of xps or 1 inch of polyiso. Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets.

This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. Install nailbase for cladding. Once the roof demo was complete and the flat roof was cleared of any remaining debris some rotted 2x material around the perimeter of the roof was replaced. This foam board insulation is available with straight or tongue and groove edges to help limit air movement.

Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. This product is suitable for use in wall sheathing applications in new.