Why Is There Gravel On Flat Roofs

One is to act as ballast to weigh down the covering surface and help prevent it being blown off in high winds.

Why is there gravel on flat roofs.

The heat of the day can cause the tar or whatever you used to bubble or an edge can get picked up by the wind. To protect the underlying roof materials and to weigh down and secure them. To weigh down or secure the roofing material as is the case with single ply flat roofs. Flat roofs usually come with a 10 to 20 year warranty but can last 25 years if you build the roofs right and maintain them using commonsense rules.

The most common type used for residential flat roofing is epdm ethylene propylene diene monomer a synthetic rubber sheet material that is also commonly used as a pond liner. The gravel helps hold the waterproof layer down and protects it from heat and sun. Contractors and builders use gravel on flat roofing for two primary reasons. A gravel or pea shingle on a roof serves two purposes.

Gravel is used on flat roofs for two reasons. There are several types of membrane roofing materials including rubber and plastic formulations. Built up roof bur the traditional hot tar and gravel roof is built from three or more plies of waterproof material alternated with hot tar and ballasted by a layer of smooth river stone. If you are unsure about the purpose of putting gravel on flat roofs know that there are some really good reasons.

The gravel is mostly put on flat felt roofs to serve as a heat barrier from the sun otherwise the felt would soften and blister and then when it was cold the creases in it would crack and cause. The second is to provide. The main reason is to protect the felt bitumen or tar from uv damage which prolongs the life of the roof without this protection the black surface absorbs the heat of the sun to the point of melting. However adding gravel to a flat roof must be done after a specialist has inspected the roof and made the necessary recommendation because there are different types of gravels.

Why do they put pea gravel on top of the tar on a flat roof. Membrane single ply roofing. Gravel is an excellent fire. There are different types and weights of gravel used on flat roofs for these purposes.

Once made of tar paper these types of roofs gradually are using more advanced materials such as fiberglass membranes. The first is to protect the underlying layer of roofing materials on built up roofs burs and the second is to secure or weigh down the roofing material as is the case with single ply flat roofs.