Why Put Stones On Flat Roofs

No stones for us as it was a bay window.

Why put stones on flat roofs.

Specifically there are two main reasons to use a ballasted roof system. The gravel prevents sun hail errant baseballs etc from damaging the membrane the all important moisture seal created by the tar paper and tar. The stones force it to stay put. There are different types and weights of gravel used on flat roofs for these purposes.

Having a large flat roof this is something that i pondered on too. Your roofing merchants can supply the stones. There are several reasons flat roofs have stones. 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.

This is the protective cover that keeps the layers of tar and bitumen from deteriorating in the weather. Gravel to protect built up roofs. Here alternating layers of roofing felt usually fiberglass and hot applied asphalt are combined to create a long lasting roof system. Contractors and builders use gravel on flat roofing for two primary reasons.

But as said the stones help the roof from bubbling etc from the sun. 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. If the roof is a built up roof made with layers of tar and bitumenous sheets it creates a wear layer for the roof. The stones does 3 things 1 help to keep the roof fire resistance.

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. On more expensive mebrane rooves you dont need pebbles. We used on a flat roof bitumen mastic to plug a hole we then painted with a water proof roofing paint. 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.

Built up roof bur the traditional hot tar and gravel. Both factors can extend the life of your flat roof. What are tar gravel roofs or built up roofs. Stone is also used as a ballast for single ply membrane roofing.

2 to break up the rain into fine mists and keep the noise level down. We had to replace a big portion of our flat roof recently. 3 to protect the roofing felt from perishing and heat melting the bitumen. 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.