R Value Of Wood Siding

Vinyl siding without insulation has an r value of 0 67.

R value of wood siding.

The r value of a structure made of layers of different materials can be estimated by adding the r values of the layers. Here s a brief list of siding materials and their r values. Most such r value tables ascribe an r value of r 0 87 for wood shingle siding. The r value of a layer can be estimated by multiplying its thickness in inches by the r value per inch.

R value of typical 3 4 thick pine softwood about r 1 25 30 wood door solid per inch. As we said before the r value measures the thermal resistance of a material. R value measures how well certain building insulation materials can resist heat. Most siding materials have an r value of less than 1.

If any readers think that the r value of cedar shingles might be higher it s worth consulting standard r value tables for a reality check. Wall outside air film. 1 01 1 41 softwoods 0 71 hardwoods the r value of wood varies by wood density species moisture content. Per inch r value of softwood is 1 41.

Logs of around 6 inches would then have an r value that is about 8. This value when compared to other insulating materials is actually pretty low. Wood r values log wall r values vary 16. Wood bevel siding 8 lapped.

If you are using thicker 5 8 inch shingles the installed siding will have an r value of at most about r 1 9. With no insulation behind either material wood siding is slightly more energy efficient having an r value of 0 81 to 0 87. For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15. The higher the r value the greater the insulation performance.

It is so low that it is below many industry standards. That includes standard vinyl steel or aluminum siding without added foam insulation. In hardwood it is 0 71. Know exactly how much you need with our project calculators.

Varies by species no authoritative source. Soft wood lumber 1 25 2 inch nominal 1 inch 1 88 2 x 4 3 inch 4 38 2 x 6 5 inch 6 88 cedar logs and lumber 1 33 sheathing materials plywood 1 25 inch 0 31 inch 0 47 inch 0 63 inch 0 77 inch 0 94 fiberboard 2 64 inch 1 32.