Weight Of Ballasted Roof

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

Weight of ballasted roof.

Roof perimeters and penetrations are flashed in accordance with firestone specifications pdf. Roofs with pavers as ballast can be used as outdoor patios. Slope design shall not exceed 2 inches in 12 inches. 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.

Weight of roofing materials. Multi story buildings and perimeters will often require more than 10 psf ballast for. Epdm roof membrane 60 mil fully adhered. 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.

Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm. Other interlocking ballast pavers are available as well. 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. Check out eng tips forum s policies here.

1075 2000 lbs. Extremely difficult to find a leak in this system since the membrane is well hidden. After combining the weight of components i e. The buildup is ballasted with a gravel layer of at least 50 mm and 80 kg m 2.

The weight of roofing constructions above the truss rafter may be estimated with the calculator below. Previous all faqs next. Ballasted roof dead load jike structural 19 jun 14 22 09. Perimeter attachment shall be designed to withstand a minimum load of 100 pounds per linear foot.

Lightweight interlocking pavers with integral cementitious coating the panels shall be interlocking and weigh a minimum of 4 0 psf. The single ply membrane and other roof components including thermal insulation are loose laid. Gravel ballasted roofs with sikaplan or sarnafil single ply membranes are conventionally installed. 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.

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. A loose ballasted roof where you have 1 to 2 inches of gravel is more on the order of 12 psf.