Rigid Foam Board Roof Insulation

Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance.

Rigid foam board roof insulation.

Flat roof insulation installation the rigid foam board insulation we used was 2 thick and came in 4 x 8 sheets. 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. As my article states you need a minimum of about 1 5 inch of eps 1 inch of xps or 1 inch of polyiso. 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.

Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. R matte plus 3 thermasheath 3 is rigid foam plastic thermal insulation r matte plus 3 thermasheath 3 is rigid foam plastic thermal insulation board composed of environmentally sound closed cell polyisocyanurate foam bonded to a durable white matte non glare aluminum facer and a reflective reinforced aluminum facer. Install nailbase for cladding.

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. This foam board insulation is available with straight or tongue and groove edges to help limit air movement.