Polystyrene Roof Insulation R Value

You should of course see the manufacturer provided technical data sheet for the r value of specific products.

Polystyrene roof insulation r value.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. Choose rigid insulation wisely and consider the effect its characteristics will have on the performance of the your project overall product cost and the best way to get the bang for your buck. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. The r value performance for eps insulation is discussed in the report report on expanded polystyrene insulation for use in built up and single ply roofing systems by rene m.

Expanded polystyrene insulation is similar to the foam used for packing peanuts and it s typically used for insulated concrete forms also knows as icf s. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. For a very good introductory overview article on r value see r values over at the website of. The report shows that samples of eps insulation had no deterioration in r value.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Dupuis and jerome g. This product typically has an r value of 3 6 to 4 0 per inch of thickness. Expanded polystyrene eps extruded polystyrene xps styrofoam tm.

Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior. Products provide superior insulating properties. R value of various materials. Insulfoam i vii ii ix xiv and xv.

Dees dated august 1984. Foamular extruded polystyrene xps rigid foam insulation offers foamular extruded polystyrene xps rigid foam insulation offers a comprehensive line of products choose the strength you need from 15 to 60 psi and exceptional moisture resistance. Roof area calculator for cathedral ceilings. Flat tapered eps roofing insulation insulfoam taper is an engineered insulation consisting of a superior closed cell lightweight expanded polystyrene eps.

Insulfoam taper is cut from the same high quality eps as our flat insulroof products and meets or exceeds the requirements of astm c578 standard.