R Value Of Wood Siding

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.

R value of wood siding.

Wall outside air film. If you are using thicker 5 8 inch shingles the installed siding will have an r value of at most about r 1 9. R value measures how well certain building insulation materials can resist heat. Wood r values log wall r values vary 16.

This is negligible however as a fully insulated exterior should have an r value of 13. Vinyl siding without insulation has an r value of 0 67. 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.

1 01 1 41 softwoods 0 71 hardwoods the r value of wood varies by wood density species moisture content. Wood bevel siding 8 lapped. As we said before the r value measures the thermal resistance of a material. Logs of around 6 inches would then have an r value that is about 8.

It is so low that it is below many industry standards. 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. 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. 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. When determining how much insulation you need don t guesstimate calculate. Most siding materials have an r value of less than 1. The r value of a structure made of layers of different materials can be estimated by adding the r values of the layers.

In hardwood it is 0 71. With no insulation behind either material wood siding is slightly more energy efficient having an r value of 0 81 to 0 87. Per inch r value of softwood is 1 41. Wood siding shingles 16 7 exposure.

That includes standard vinyl steel or aluminum siding without added foam insulation. This value when compared to other insulating materials is actually pretty low.