Gypsum Roof Deck R Value

R value of various materials.

Gypsum roof deck r value.

To convert rsi to r value multiply the rsi by 5 67826. Does not consider presence absence of reflective barriers. 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. The amount shown is an average amount used for roof system r value calculations.

The u value includes the thermal resistance values for roofing and both inside and outside air films in addition to the insulation material. As we said before the r value measures the thermal resistance of a material. 40 178 weights nom. For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1.

Does not consider directions of heat flow up or down nor winter summer conditions. Rsi r value système international is the metric equivalent. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. R value of building materials material r inch r thick ness fiberglass inch 3 00.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. Densdeck roof boards can replace any generic type x gypsum board in any roof assembly in the ul fire resistance directory under the prefix. R value is used in the united states. These fibrous decks generally have a gypsum like or cementitious binder and combine the functions of a roof deck thermal insulation and finished ceiling.

Gypsum board drywall inch 0 45 inch 0 56. To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. Does not consider internal convection effects. The tables show a u value r value and c value for several thicknesses of siplast roof insulation systems.

A u value incorporates the total system approach to insulation design. R values 28 tested in accordance with astm c518 spannings. The r 0 87 value for the first value in this air r value table subsection. For a very good introductory overview article on r value see r values over at the website of.

They also have acoustical value and are oftentimes used in schools and restaurants. Extruded expanded polystyrene insulation is. 1 4 dens deck roof board.