Gypsum Roof Deck R Value

Does not consider directions of heat flow up or down nor winter summer conditions.

Gypsum roof deck r value.

Densdeck roof boards can replace any generic type x gypsum board in any roof assembly in the ul fire resistance directory under the prefix. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. R values 28 tested in accordance with astm c518 spannings. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1.

Referred to as meps can have an r value that will vary from less than 4 00 to slightly more than 4 00. The r 0 87 value for the first value in this air r value table subsection. Rsi r value système international is the metric equivalent. 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.

These fibrous decks generally have a gypsum like or cementitious binder and combine the functions of a roof deck thermal insulation and finished ceiling. They also have acoustical value and are oftentimes used in schools and restaurants. Extruded expanded polystyrene insulation is. R value is used in the united states.

The u value includes the thermal resistance values for roofing and both inside and outside air films in addition to the insulation material. Gypsum board drywall inch 0 45 inch 0 56. 40 178 weights nom. 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.

A u value incorporates the total system approach to insulation design. To convert rsi to r value multiply the rsi by 5 67826. For a very good introductory overview article on r value see r values over at the website of. You should of course see the manufacturer provided technical data sheet for the r value of specific products.

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. 1 4 dens deck roof board. As we said before the r value measures the thermal resistance of a material. The amount shown is an average amount used for roof system r value calculations.

R value of various materials. R value of building materials material r inch r thick ness fiberglass inch 3 00. Does not consider presence absence of reflective barriers.