Weight Of Roof Ballast

Everguard tpo ballasted roof systems the selection of membrane type thickness and attachment is the responsibility of the architect engineer owner or roof consultant.

Weight of roof ballast. The weight of a roofing system varies depending on components used. 1 lb m ft 2 4 88 kg m 2. Since the ballast is the primary resistance to wind uplift there has to be a lot of ballast installed on the roof. The standard ballast paver is stocked in a natural color and a non slip diamond finish.

Gaf everguard roof membranes must be used in roofing systems to be guaranteed by gaf. A registered professional engineer at the request and expense of the owner or architect shall evaluate the roof structure to ensure it can receive the weight of the ballast paver system. Foot traffic should be limited to the occasional pedestrian or maintenance personnel. Membrane and stone ballast only 10 75 20 lbs.

A wide range of sizes are available. Ballast stone traps a lot of dirt making patching difficult. Unlike river gravel which has been known to be hazardous pavers used as ballast or walkways provide a durable safe method of protecting the roof system. The weight of truss rafter must be added to calculate the dead load of the roof.

After combining the weight of components i e. Roofs with pavers as ballast can be used as outdoor patios. If you do the wind uplift calcs that s woefully deficient for higher wind load areas so if that s where you are recommend against its use. Drawbacks of a ballasted roof system.

Specifically there are two main reasons to use a ballasted roof system. Don t forget to add all roof assembly materials when calculating total roof weight. 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 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.

Both factors can extend the life of your flat roof. Ballast pavers are not intended to be used as a plaza deck. 1075 2000 lbs. The weight provided by the gravel is used to anchor down the roof materials therefore using far fewer fasteners to hold the materials to the decking.

The following is a list of eligible membranes. 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. Extremely difficult to find a leak in this system since the membrane is well hidden. Most systems have 10 to 12 psf for ballast.