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Fairfax county attic insulation code.
The term habitable attic is relatively new to the residential code.
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A finished or unfinished attic that has all the makings of a living space is a habitable attic.
R402 2 4 attic hatches.
5 insulation must extend from the slab edge to a length of 24 inches vertically and or horizontally.
Table r402 1 4 change cz4 ceiling insulation levels to u 0 030 and cz4 wood frame wall requirement to u 0 079.
For example cellulose attic insulation has an r value of r 3 7 per inch.
Please illustrate or otherwise provide information to show compliance with applicable code requirements.
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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Attic habitable it appears that this design meets the definition of attic habitable.
For any thickness the total r value equals the rated r per inch multiplied by the thickness in inches.
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.
Use r 13 when insulation is applied on the interior.
Use r 13 when applied between studs or furring strips.
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4 use r 10 when applied continuously against the wall.
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3 use r 8 when insulation is applied to the exterior.
A 6 inch thick installation will therefore have a total r value of r 22 2 6 inches x 3.
The r value of an insulation material is usually listed in terms of r per inch.
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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