Generally loose laid ballasted roofing systems are not recommended or at least discouraged for three reasons.
Roof ballast depth.
2 the membranes tend to pull at their perimeter ties raising and stretching the.
Somebody walking on the roof will undoubtedly step on the ballast and put a hole in the membrane.
In the field of the roof a minimum of 10 lbs s f.
Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer.
Additional benefits of ballast on a flat roof.
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.
Needed at perimeters and at large penetrations.
The heavier stones provide substantial protection against wind gusts.
Ballasted flat roofs are a popular choice especially for commercial buildings.
Ballasted roof systems are simultaneously a roofer s best friend and arch nemesis.
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.
Finally the ballast stone or and pavers are laid down throughout the roof system.
Or you may call us at 440 946 2233.
Benefits of a ballasted roof system.
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.
The weight of the ballast equals the weight of the water it causes the vessel to displace.
Holes mean roof leaks and roof leaks mean call the roofer.
Installs very quickly since no fasteners or adhesives are used.
Contact hydrotech for specific installation guidelines.
Seawater weighs 64 1 pounds per cubic foot.
Modular trays can have a variety of different outlet designs according to the goals of the installation e g reduce peak flows achieve specific lag time for target events etc.
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.
Stone ballast typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation.
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.
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.
Doesn t produce any foul smell during construction.
Ballast is required with 20 lbs s f.
The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer.
For built up roofing the gravel was generally 25 5 inches in diameter.
Ballast stones are usually one to two inches thick and applied more generously than on a built up roof.
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.
Divide the amount of ballast to be added or removed by 64 1.
