Roof Ballast Depth

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Roof ballast depth.

In the field of the roof a minimum of 10 lbs s f. The gravel used in built up roofing what the roofing contractors were used to was not the same as that used in a ballasted roof. Generally loose laid ballasted roofing systems are not recommended or at least discouraged for three reasons. For built up roofing the gravel was generally 25 5 inches in diameter.

The weight of the ballast equals the weight of the water it causes the vessel to displace. Ballasted roof systems are simultaneously a roofer s best friend and arch nemesis. Installs very quickly since no fasteners or adhesives are used. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer.

To learn more about selecting a commercial roofer in cleveland ohio simply fill out the form on this page and a member of our team will be in touch. Somebody walking on the roof will undoubtedly step on the ballast and put a hole in the membrane. 1 a leak is very difficult to locate because the water runs freely in numerous directions and for longer distances under the loose laid membrane. Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer.

Ballasted flat roofs are a popular choice especially for commercial buildings. Track ballast should never be laid down less than 150 mm 6 inches thick and high speed railway lines may require ballast up to 0 5 metres 20 inches thick. Needed at perimeters and at large penetrations. The depth of the ballast or media contained in the trays can be varied depending on the desire to reduce the presence of open water surfaces.

Though not as common as they used to be ballasted roof systems still prove to be a viable solution for today s commercial roof needs. If you remove 64 1 pounds of ballast then the vessel will displace 1 cubic foot of water less than it did before the 64 1 pounds of ballast was removed. Ballast is required with 20 lbs s f. Seawater weighs 64 1 pounds per cubic foot.

Roofing southwest a ballast system helps cut roof system application costs as it takes less time to install since sealing the layers together isn t necessary. Benefits of a ballasted roof system. Holes mean roof leaks and roof leaks mean call the roofer. Additional benefits of ballast on a flat roof.

2 the membranes tend to pull at their perimeter ties raising and stretching the. An insufficient depth of ballast causes overloading of the underlying soil and in unfavourable conditions overloading the soil causes the track to sink usually unevenly. Most roofers typically installed 10 15 pounds of ballast per square foot. Finally the ballast stone or and pavers are laid down throughout the roof system.

Contact hydrotech for specific installation guidelines. Ballast stones are usually one to two inches thick and applied more generously than on a built up roof. The heavier stones provide substantial protection against wind gusts. Doesn t produce any foul smell during construction.