4 use r 10 when applied continuously against the wall.
Fairfax county attic insulation code.
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Table r402 1 2 change cz4 ceiling insulation levels to r 38 and cz4 wood frame wall requirement to r 15 or r 13 r 1.
A 6 inch thick installation will therefore have a total r value of r 22 2 6 inches x 3.
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R402 2 4 attic hatches.
The code for land development is administered by fairfax county s department of land development services.
Please illustrate or otherwise provide information to show compliance with applicable code requirements.
The r value of an insulation material is usually listed in terms of r per inch.
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5 insulation must extend from the slab edge to a length of 24 inches vertically and or horizontally.
For example cellulose attic insulation has an r value of r 3 7 per inch.
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Amendments additional state code information.
Use r 13 when applied between studs or furring strips.
A finished or unfinished attic that has all the makings of a living space is a habitable attic.
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Table r402 1 4 change cz4 ceiling insulation levels to u 0 030 and cz4 wood frame wall requirement to u 0 079.
3 use r 8 when insulation is applied to the exterior.
The codes regulating site development are generated from federal state and county laws regulations resolutions and policies as well as specific standards from the virginia department of transportation.
Use r 13 when insulation is applied on the interior.
2015 r202 r301 5 blocking between the trusses when using a roof design incorporating a raised roof rafter or truss heel blocking is required.
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For any thickness the total r value equals the rated r per inch multiplied by the thickness in inches.
Fairfax county virginia land development services building officials blog.
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