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Does not consider presence absence of reflective barriers.
Gypsum roof deck r value. The tables show a u value r value and c value for several thicknesses of siplast roof insulation systems. These fibrous decks generally have a gypsum like or cementitious binder and combine the functions of a roof deck thermal insulation and finished ceiling. R values 28 tested in accordance with astm c518 spannings. 1 4 dens deck roof board.
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. You should of course see the manufacturer provided technical data sheet for the r value of specific products. Extruded expanded polystyrene insulation is. Rsi r value système international is the metric equivalent.
To convert rsi to r value multiply the rsi by 5 67826. Referred to as meps can have an r value that will vary from less than 4 00 to slightly more than 4 00. R value of building materials material r inch r thick ness fiberglass inch 3 00. R value is used in the united states.
For a very good introductory overview article on r value see r values over at the website of. A u value incorporates the total system approach to insulation design. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. The r 0 87 value for the first value in this air r value table subsection.
1 4 spans flute widths up to 2 5 8 flexural strengths parallel lbs. 40 178 weights nom. Does not consider directions of heat flow up or down nor winter summer conditions. Does not consider internal convection effects.
For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. Densdeck roof boards can replace any generic type x gypsum board in any roof assembly in the ul fire resistance directory under the prefix. Carpet fibrous pad 2 08 rubber pad 1 23 roofing materials asphalt shingles 0 44 wood shingles 0 97 windows single glass 0 91 w storm 2 00 double insulating glass inch. R value of various materials.
As we said before the r value measures the thermal resistance of a material. Gypsum board drywall inch 0 45 inch 0 56. The amount shown is an average amount used for roof system r value calculations.
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