Gravel Bakkast Roof

Published by justin on september 19 2019 september 19 2019.

Gravel bakkast roof.

The purpose of stone or gravel ballast on a flat roof. A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. It also provides protection from foot traffic.

Somebody walking on the roof will undoubtedly step on the ballast and put a hole in the membrane. Roof gravel provides a protective layer to flat roofs reducing the weather damaging effects from uv rays and heavy snow hail and wind. Most ballasted roof systems use gravel stone that is similar to what would be used in landscaping. Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer.

Gravel roof advantages most gravel roofs are inexpensive to build offer some protection to vulnerable asphalt against uv damage and the stones are very durable. It is not unusual to find a gravel top coat on commercial roofing systems. When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. 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.

Ballast tar gravel roofing. Gravel ballasted roofs with sikaplan or sarnafil single ply membranes are conventionally installed. Though primarily confined to built up asphalt roofing systems it can be applied to single ply epdm rubber based membranes as well. The single ply membrane and other roof components including thermal insulation are loose laid.

Ballasted roof systems are simultaneously a roofer s best friend and arch nemesis. Holes mean roof leaks and roof leaks mean call the roofer. Gravel roof disadvantages on the other hand gravel roofs are hot energy inefficient heavy moisture trapping and unstable. For built up roofing the gravel was generally 25 5 inches in diameter.

However other ballasted systems use pavers which are easier to walk on and can be. 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. Our roof gravel is available for delivery in tunnel lift bulk bags allowing an easy method of transporting the gravel onto a roof using a crane not provided. The buildup is ballasted with a gravel layer of at least 50 mm and 80 kg m 2.

Ballasted roof systems have been installed since the early 1970 s. These small stones.