Why Put Stones On Flat Roofs

Gravel to protect built up roofs.

Why put stones on flat roofs. A built up roof bur sometimes called a tar and gravel roof is a tried and true style of flat roof. Your roofing merchants can supply the stones. 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. Here alternating layers of roofing felt usually fiberglass and hot applied asphalt are combined to create a long lasting roof system.

We used on a flat roof bitumen mastic to plug a hole we then painted with a water proof roofing paint. Stone is also used as a ballast for single ply membrane roofing. What are tar gravel roofs or built up roofs. Both factors can extend the life of your flat roof.

We had to replace a big portion of our flat roof recently. Built up roof bur the traditional hot tar and gravel. There are different types and weights of gravel used on flat roofs for these purposes. This is the protective cover that keeps the layers of tar and bitumen from deteriorating in the weather.

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. No stones for us as it was a bay window. There are several reasons flat roofs have stones. These small stones are worth more than their weight in the protection they offer for underlying roofing materials and the barrier they provide to external elements like ultraviolet rays and harsh weather elements.

If the roof is a built up roof made with layers of tar and bitumenous sheets it creates a wear layer for the roof. Having a large flat roof this is something that i pondered on too. The stones force it to stay put. The chips act as a barrier between non solar reflective felt and the sun basically help prolong its life span of the felt if its green mineral on your new roof you will not have to chip it as the minerals are solar reflective.

3 to protect the roofing felt from perishing and heat melting the bitumen. On more expensive mebrane rooves you dont need pebbles. The stones does 3 things 1 help to keep the roof fire resistance. But as said the stones help the roof from bubbling etc from the sun.

For mineral based felting the pebbles are there to help protect the felting as ballast depending on the fitting type and to help prevent water pooling aparantly. The gravel prevents sun hail errant baseballs etc from damaging the membrane the all important moisture seal created by the tar paper and tar. 2 to break up the rain into fine mists and keep the noise level down. A layer of gravel or small stones is applied on top of the final coating of asphalt to protect the roof from the elements including.