Poured Gypsum Roof Deck R Value

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

Poured gypsum roof deck r value.

As we said before the r value measures the thermal resistance of a material. These fibrous decks generally have a gypsum like or cementitious binder and combine the functions of a roof deck thermal insulation and finished ceiling. The increase r21 r3 exactly 18 the value by which you are increasing the r value. The amount shown is an average amount used for roof system r value calculations.

1 4 dens deck roof board. 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 of building materials material r inch r thick ness fiberglass inch 3 00. Its use increased since it provided roof deck fire protection diaphragm values and an economical substrate for roofing.

Referred to as meps can have an r value that will vary from less than 4 00 to slightly more than 4 00. It is mixed at the job site with clean water only and poured in place as a patch for existing gypsum decks. A u value incorporates the total system approach to insulation design. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number.

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. R3 r18 r21 total roof r value. 1 4 spans flute widths up to 2 5 8 flexural strengths parallel lbs. Free water will cause the gypsum concrete to decompose and lose structural strength.

The percentage increase increase increase original number 100. They also have acoustical value and are oftentimes used in schools and restaurants. Poured concrete 0 08 soft wood lumber 1 25 2 inch nominal 1 inch 1 88. 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.

Gypsum decks incorporated the placement of bulb tees. Usg securock gypsum concrete patch is noncombustible and used in several ul approved roof deck systems. 40 178 weights nom. Poured gypsum decks provide stable structural properties if kept moisture free.

Extruded expanded polystyrene insulation is. The tables show a u value r value and c value for several thicknesses of siplast roof insulation systems. Usg securock brand gypsum concrete patch is mill formulated and composed of specially calcined gypsum and wood chips or shavings.