In windy areas ballast stone can actually blow off the roof creating projectiles below.
Flat roof stone ballast.
Your flat roof requires repairs but it s covered in either gravel or ballast stones which makes it challenging to work on.
The purpose of stone or gravel ballast on a flat roof.
Though primarily confined to built up asphalt roofing systems it can be applied to single ply epdm rubber based membranes as well.
The s flex roof frame with ballast is the simple and proven solution for non penetrative green roof compatible flat roof installations.
It s fire resistance ballast roofing offers class a fire resistance without the need for gypsum underlayments or expensive fire.
Ballast stone can crush the underlying insulation creating weak spots in the roof membrane.
If you ve ever seen a flat roof covered with gravel and wondered why the answer is simple it s there to keep the roof in place.
Next the membrane is rolled over the insulation 2.
The easiest way to use flat roofs for photovoltaic systems.
It is not unusual to find a gravel top coat on commercial roofing systems.
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.
Stone ballast is no longer allowed by many building codes.
The insulation is loose laid onto the decking.
Published by justin on september 19 2019 september 19 2019.
Ballasted flat roofs are a popular choice especially for commercial buildings.
The stone ballast on a ballasted roof system is the only thing holding the roof system in place.
Over time the stones move around creating bald spots where the system isn t held down at all.
I was on the roof about 2 hours after sundown and the roof appeared uniform in temperature.
A number of attachment and ballast options are available depending on the planned system and the conditions on site.
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.
I recently looked a leaky flat rubber mambrane roof having large river stone ballast.
Additional benefits of ballast on a flat roof.
Roof survey large stone ballast.
Ballast is commonly used with roofs made of tar and gravel roof alternatives including ethylene propylene diene monomer epdm polyvinyl chloride pvc and thermoplastic polyolefin tpo single ply flat roofs.
Stones have been used as roofing ballast since antiquity and in its modern form stone ballast goes back to at least the 1970s.
There are no fasteners installed at all 3 and 4.
