Weight Of Ballasted Roof

Extremely difficult to find a leak in this system since the membrane is well hidden.

Weight of ballasted roof. A loose ballasted roof where you have 1 to 2 inches of gravel is more on the order of 12 psf. Roof perimeters and penetrations are flashed in accordance with firestone specifications pdf. 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. The weight of roofing constructions above the truss rafter may be estimated with the calculator below.

Drawbacks of a ballasted roof system adds a lot of weight to the roof system typically 10 15 pounds per square feet. 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. 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. Weight of roofing materials.

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. The buildup is ballasted with a gravel layer of at least 50 mm and 80 kg m 2. Previous all faqs next. 1075 2000 lbs.

Slope design shall not exceed 2 inches in 12 inches. 52 5 97 65 kg. Ballasted roof dead load jike structural 19 jun 14 22 09. Gravel ballasted roofs with sikaplan or sarnafil single ply membranes are conventionally installed.

Perimeter attachment shall be designed to withstand a minimum load of 100 pounds per linear foot. Last updated july 22 2020. Multi story buildings and perimeters will often require more than 10 psf ballast for. Epdm roof membrane 60 mil fully adhered.

Roofs with pavers as ballast can be used as outdoor patios. After combining the weight of components i e. Epdm roof membrane 60 mil ballasted membrane and stone ballast only 10 75 20 lbs. The single ply membrane and other roof components including thermal insulation are loose laid.

Lightweight interlocking pavers with integral cementitious coating the panels shall be interlocking and weigh a minimum of 4 0 psf. 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.