Osb thickness inch r value 3 8 0 45 7 16 0 51 1 2 0 62 5 8 0 74 3 4 0 91 plywood thickness inch r value 1 4 0 31 3 8 0 47 15 32 0 59 1 2 0 62 19 32 0 74.
R value of wood sheeting.
The general plywood r value per inch is 1 25.
As we said before the r value measures the thermal resistance of a material.
In exterior walls add insulating sheathing to achieve a greater r value in your wall system.
These values are listed in chapter 25 table 4 of the 2001 ashrae handbook published by the american society of heating refrigeration and air conditioning engineers ashrae.
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 inch 2 06 r value of building materials material r inch r thick ness fiberglass inch 3 00 1 inch 4 00 inch 6 00.
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The r value of wood varies by wood density species moisture content.
1 4 plywood r value 0 31 3 8 plywood r value 0 47.
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.