R Values For Roofs

To convert rsi to r value multiply the rsi by 5 67826.

R values for roofs.

Here are the r values of the most popular commercial roofing systems. Types of roof insulation. 0 34 per inch of thickness bur smooth. 0 24 per inch of thickness.

6 6 per inch of thickness metal. If insulation is compressed its r value is reduced by its compression. 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. The higher the r value the more the material insulates.

Location of r value on a product data sheet. A material s r value is the measure of its resistance to heat flow. The way it works is simple. 0 33 per inch of thickness bur gravel.

For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1 93721. R value table for roofing materials and building insulation. The higher the r value the greater the insulation performance. The higher the r value the better a material performs as a thermal insulator.

R value measures how well certain building insulation materials can resist heat. Insulation with r 2 5 is compressed from 94mm to 78mm i e. Know exactly how much you need with our project calculators. 0 00 per inch of thickness tpo.

Always check with your local code authority. R value is used as a measurement of the effectiveness of thermal insulating materials. When determining how much insulation you need don t guesstimate calculate.