Poured Gypsum Roof Deck R Value

A u value incorporates the total system approach to insulation design.

Poured gypsum roof deck r value.

Extruded expanded polystyrene insulation is. 1 4 dens deck roof board. Its use increased since it provided roof deck fire protection diaphragm values and an economical substrate for roofing. Poured gypsum decks provide stable structural properties if kept moisture free.

The tables show a u value r value and c value for several thicknesses of siplast roof insulation systems. R values 28 tested in accordance with astm c518 spannings. Roofing materials asphalt shingles 0 44 wood shingles 0 97 windows single glass 0 91. Damage that can cause loss of the structural composite strength is most likely to come from leakage of water into the roof deck from unattended roof leaks.

Referred to as meps can have an r value that will vary from less than 4 00 to slightly more than 4 00. Densdeck roof boards can replace any generic type x gypsum board in any roof assembly in the ul fire resistance directory under the prefix. The increase r21 r3 exactly 18 the value by which you are increasing the r value. Free water will cause the gypsum concrete to decompose and lose structural strength.

They also have acoustical value and are oftentimes used in schools and restaurants. R3 r18 r21 total roof r value. Gypsum poured over formboards has been used as a substrate for roofing materials since the 1940 s. Gypsum decks incorporated the placement of bulb tees.

Poured concrete 0 08 soft wood lumber 1 25 2 inch nominal 1 inch 1 88. It is mixed at the job site with clean water only and poured in place as a patch for existing gypsum decks. These fibrous decks generally have a gypsum like or cementitious binder and combine the functions of a roof deck thermal insulation and finished ceiling. Usg securock brand gypsum concrete patch is mill formulated and composed of specially calcined gypsum and wood chips or shavings.

1 4 spans flute widths up to 2 5 8 flexural strengths parallel lbs. As we said before the r value measures the thermal resistance of a material. R value of building materials material r inch r thick ness fiberglass inch 3 00. Usg securock gypsum concrete patch is noncombustible and used in several ul approved roof deck systems.

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 percentage increase increase increase original number 100. The u value includes the thermal resistance values for roofing and both inside and outside air films in addition to the insulation material.