Weight Of Ballasted Roof

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Weight of ballasted roof.

It can also be a bit challenging to find a leak with a ballasted roof system and because the stones tend to collect a lot of dirt patching it can be a bit difficult. Extremely difficult to find a leak in this system since the membrane is well hidden. Once completed the epdm membrane is held in place using one of the following materials as ballast with a minimum weight of 50 kg m. A loose ballasted roof where you have 1 to 2 inches of gravel is more on the order of 12 psf.

The weight of roofing constructions above the truss rafter may be estimated with the calculator below. Insulation membrane fasteners and adhesive typical installation weight is less than 2 pounds per square foot 10 kg per square meter when 060 thick membrane typically weighing 1 3 pound per square foot or 1 6 kg per square meter is utilized. Slope design shall not exceed 2 inches in 12 inches. The single ply membrane and other roof components including thermal insulation are loose laid.

Roofs with pavers as ballast can be used as outdoor patios. Gravel ballasted roofs with sikaplan or sarnafil single ply membranes are conventionally installed. None asphalt roll roofing 1 1 lb m ft 2 5 4 kg m 2 asphalt shingle or asphalt fiberglass composite shingle 2 7 lb m ft 2 13 2 kg m 2. Multi story buildings and perimeters will often require more than 10 psf ballast for.

The buildup is ballasted with a gravel layer of at least 50 mm and 80 kg m 2. In the case of ballasted roofs ballast will consist of rounded gravel 20 40 mm diameter at a minimum rate of 80 kg per square metre and 50 mm thickness or pre cast hydraulically pressed concrete pavers of 50 mm minimum thickness and approximately 120kg m2. Epdm roof membrane 60 mil ballasted membrane and stone ballast only 10 75 20 lbs. Last updated july 22 2020.

Ballasted roof dead load jike structural 19 jun 14 22 09. Check out eng tips forum s policies here. Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm. Drawbacks of a ballasted roof system adds a lot of weight to the roof system typically 10 15 pounds per square feet.

52 5 97 65 kg. After combining the weight of components i e. The weight on a ballasted roof can be from 10 to 25 pounds per square foot meaning the substructure must be designed specifically to carry more weight than other roofing systems. Other interlocking ballast pavers are available as well.

Lightweight interlocking pavers with integral cementitious coating the panels shall be interlocking and weigh a minimum of 4 0 psf. Weight of roofing materials. Perimeter attachment shall be designed to withstand a minimum load of 100 pounds per linear foot.