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.
Roof ballast depth.
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.
Stone ballast typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation.
Seawater weighs 64 1 pounds per cubic foot.
The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer.
Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer.
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Ballast stones are usually one to two inches thick and applied more generously than on a built up roof.
Holes mean roof leaks and roof leaks mean call the roofer.
2 the membranes tend to pull at their perimeter ties raising and stretching the.
Ballasted roof systems are simultaneously a roofer s best friend and arch nemesis.
Generally loose laid ballasted roofing systems are not recommended or at least discouraged for three reasons.
Installs very quickly since no fasteners or adhesives are used.
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.
Doesn t produce any foul smell during construction.
Needed at perimeters and at large penetrations.
Benefits of a ballasted roof system.
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.
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.
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Most roofers typically installed 10 15 pounds of ballast per square foot.
Ballast is required with 20 lbs s f.
Contact hydrotech for specific installation guidelines.
In the field of the roof a minimum of 10 lbs s f.
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.
Finally the ballast stone or and pavers are laid down throughout the roof system.
Ballasted flat roofs are a popular choice especially for commercial buildings.
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.
The heavier stones provide substantial protection against wind gusts.
Additional benefits of ballast on a flat roof.
Divide the amount of ballast to be added or removed by 64 1.
Somebody walking on the roof will undoubtedly step on the ballast and put a hole in the membrane.
For built up roofing the gravel was generally 25 5 inches in diameter.
