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.

Roof insulation dimensions.

Location of r value on a product data sheet. Standard material is johns manville enrgy 3tapered and flat polyisocyanurate roof insulation. Since modern two by fours are not 4 inches the true depth of the wall cavity is 3 1 2 inches. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation.

So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. Board size 4 x 4 1 21 m x 1 21 m. 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. The standard tapered panel size is 4 x 4.

The higher the r value the better a material performs as a thermal insulator. 4 x 8 1 21 m x 2 44 m service temperature limits 100 to 200 f 73 3 to 93 3 c. The same insulation will hold more heat the thicker it is installed. Insulation for 2x4 walls most wall assemblies especially those in older homes are built with two by four 2x4 studs.

Types of roof insulation.