Foam Board Roofing

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.

Foam board roofing.

This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. It provides an r value of 4 per inch of thickness and is the cheapest type of foam board insulation. Reduce heating and cooling expense by 25 50 improve drainage and get a rigid polyurethane foam roof you can walk on. As my article states you need a minimum of about 1 5 inch of eps 1 inch of xps or 1 inch of polyiso.

Foam board sheathing insulation johns manville polyiso foam sheathing insulation boards provide a continuous layer of insulation to reduce thermal bridging and improve energy efficiency. Our polyurethane foam is renewable and water proof. Foam roofing advantages of dura foam. Polyiso consists of a uniform closed cell polyisocyanurate foam core and provides one of the highest r values per inch of any rigid insulation.

It s light weight provides ease of handling. Eps is used under roofing over foundation walls and beneath siding. These roofs are lightweight durable and seamless.