Flat Roof Stone Ballast

The ballast is spread 2 4 in thickness acrossed the membrane.

Flat roof stone ballast.

A number of attachment and ballast options are available depending on the planned system and the conditions on site. Ballasted flat roofs are a popular choice especially for commercial buildings. Stones have been used as roofing ballast since antiquity and in its modern form stone ballast goes back to at least the 1970s. The insulation is loose laid onto the decking.

Ballast stone can crush the underlying insulation creating weak spots in the roof membrane. In windy areas ballast stone can actually blow off the roof creating projectiles below. I recently looked a leaky flat rubber mambrane roof having large river stone ballast. The stone ballast on a ballasted roof system is the only thing holding the roof system in place.

The easiest way to use flat roofs for photovoltaic systems. Additional benefits of ballast on a flat roof. There are no fasteners installed at all 3 and 4. The gravel in a ballasted roof helps absorb heat preventing the sun from heating the roof materials below and making the roof more energy efficient.

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. Over time the stones move around creating bald spots where the system isn t held down at all. The purpose of stone or gravel ballast on a flat roof. 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.

It is not unusual to find a gravel top coat on commercial roofing systems. 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. It s fire resistance ballast roofing offers class a fire resistance without the need for gypsum underlayments or expensive fire. Stone ballast is no longer allowed by many building codes.

Published by justin on september 19 2019 september 19 2019. 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. Most ballast removal companies will come and get the job done right but that still requires you to find a qualified roofing expert to handle the repairs. I was on the roof about 2 hours after sundown and the roof appeared uniform in temperature.

Roof survey large stone ballast. The s flex roof frame with ballast is the simple and proven solution for non penetrative green roof compatible flat roof installations.