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