Roof Weight Rating

A clay tiled roof may have a dead load.

Roof weight rating.

When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. When you have the roof racks to support your rooftop tent fitted they will be placed around 30 inches apart. Driving either on highways or around town will be fine with this type of dynamic load. This is highly regional as weights of snow for example range from 10 to 300 pounds per square foot based on moisture and volume of the snow.

This is all of the natural stresses imposed upon a roof such as snow loads rain loads and wind loads. Asphalt shingle or asphalt fiberglass composite shingle 2 7 lbm ft2 13 2 kg m2 metal roofing aluminum or steel panel sheet or shingle 1 2 lbm ft2 5 9 kg m2 terne plate copper bearing steel sheet 0 7 lbm ft2 3 4 kg m2 wood shingle or shake 2 4 lbm ft2 11 7 kg m2 zinc roofing 1 6 lbm ft2 7 8 kg m2. Wind loads depend on wind speed and can vary as widely as the snow. The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot.

The load rating is the amount of weight the vehicle manufacturer says the roof can handle. Static load rating when the vehicle is stationary. There are 3 types of load rating and the cargo rating. A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof.