Roof Insulation Dimensions

So you need to know an insulation product s thickness as well as its r value in order to compare it to another product.

Roof insulation dimensions.

In most wall applications you will use r 13 or r 15 kraft faced fiberglass insulation rolls for these two by four stud walls. R value is used as a measurement of the effectiveness of thermal insulating materials. When correctly installed tapered insulation helps eliminate problems due to ponding water and can extend the longevity of your low slope roofing system. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation.

Insulation for 2x4 walls most wall assemblies especially those in older homes are built with two by four 2x4 studs. Board size 4 x 4 1 21 m x 1 21 m. The same insulation will hold more heat the thicker it is installed. The higher the r value the better a material performs as a thermal insulator.

Insulation tapered polyiso foam roof insulation 3 5 tapered polyiso insulation provides a logical and economical answer for roofs that do not permit adequate positive drainage like low slope roofs. Since modern two by fours are not 4 inches the true depth of the wall cavity is 3 1 2 inches. Location of r value on a product data sheet. 4 x 8 1 21 m x 2 44 m service temperature limits 100 to 200 f 73 3 to 93 3 c.

R value table for roofing materials and building insulation.