R Values For Roofs

Types of roof insulation.

R values for roofs.

A material s r value is the measure of its resistance to heat flow. 0 24 per inch of thickness. Know exactly how much you need with our project calculators. The higher the r value the greater the insulation performance.

6 6 per inch of thickness metal. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. The higher the r value the more the material insulates. Insulation with r 2 5 is compressed from 94mm to 78mm i e.

0 00 per inch of thickness tpo. The way it works is simple. 0 34 per inch of thickness bur smooth. To convert rsi to r value multiply the rsi by 5 67826.

Please note that the r values for roof membranes shingles tiles air films and roof deck materials might or might not be permitted by your local code to be included when total roof assembly r value is being calculated for the purpose of satisfying energy code requirements. R value table for roofing materials and building insulation. R value measures how well certain building insulation materials can resist heat. 0 24 per inch of thickness epdm.

Always check with your local code authority. It is important to know the r value because many states or regions require that a roof system have a minimum amount of thermal resistance on commercial industrial and or institutional buildings. The higher the r value the better a material performs as a thermal insulator. Location of r value on a product data sheet.

Here are the r values of the most popular commercial roofing systems. Therefore its r value is reduced by 17 to r 2 1. 0 33 per inch of thickness bur gravel.