Polystyrene Roof Insulation R Value

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.

Polystyrene roof insulation r value.

Rigid foam insulation packs a lot of r value into a thin package but not all rigid foam performs the same. Expanded polystyrene eps extruded polystyrene xps styrofoam tm. For a very good introductory overview article on r value see r values over at the website of. 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.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. 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. 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. Insulfoam i vii ii ix xiv and xv.

The r value for foamular xps insulation is provided from testing at two mean temperatures 40ºf and 75ºf and from two aging conditioning techniques 180 day realtime aged as mandated by astm c578 and a method of accelerated aging sometimes called long term thermal resistance lttr per can ulc s770 03. 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. Flat tapered eps roofing insulation insulfoam taper is an engineered insulation consisting of a superior closed cell lightweight expanded polystyrene eps. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

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. Dupuis and jerome g. R value of various materials. The report shows that samples of eps insulation had no deterioration in r value.

Roof area calculator for cathedral ceilings. This product typically has an r value of 3 6 to 4 0 per inch of thickness. Products provide superior insulating properties. 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.

Dees dated august 1984.