Roof Deck Temperature

Fm calls their acceptable risk systems class 1 while ul calls theirs classified insulated metal deck constructions.

Roof deck temperature.

As mentioned the roof assembly can also be installed in retrofit applications. Temperature compared to conventional construction having an osb deck with or without a foil faced radiant barrier. This temperature criteria can be reduced to 40 f which corresponds to interior average conditions of 70 f 35 rh where high interior moisture loads due to spas indoor swimming pools and excessive humidification are not present. The biggest temperature difference was about 9 degrees fahrenheit which occurred around noon.

In an inverted roof construction the principal thermal insulation layer is located not only above the roof structure but also above the waterproofing resulting in the waterproofing structural deck and support structure being at a temperature close to that of the interior of the building. The cooling qualities go beyond the individual rooftop as vegetative roofs also reduce the heat that s reflected back into the atmosphere. In cold and very cold climates selecting a roof deck condensing surface temperature criteria of 45 f is very conservative. The temperature of a vegetative roof at its surface is actually cool to the touch on most days it s in total shade with a conventional roof surface protected under a dense canopy of vegetation.

This fsec study didn t look at shingle lifetime but i think that adding 9 degrees to a temperature of 150 degrees won t make much difference. Where the distance above the roof to the bottom of the raceway or cable is less than 7 8 of an inch a temperature adder of 33 c or 60 f shall be added to the outdoor temperature to determine the applicable ambient temperature for application of the temperature correction factors in table 310 15 b 2 a or table 310 15 b 2 b. The reduced foil temperature of the eps therefore further drops the radiation exchange between the roof deck and the attic floor. The average temperature difference through the day was about 2 degrees f.

Time temperature ratings the third major roof system fire test is astm e 119. Ul and fm list many roof ceiling systems in their.