Why Put Stones On Flat Roofs

No stones for us as it was a bay window.

Why put stones on flat roofs.

Here alternating layers of roofing felt usually fiberglass and hot applied asphalt are combined to create a long lasting roof system. Both factors can extend the life of your flat roof. Your roofing merchants can supply the stones. Gravel to protect built up roofs.

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. If the roof is a built up roof made with layers of tar and bitumenous sheets it creates a wear layer for the roof. We had to replace a big portion of our flat roof recently. Contractors and builders use gravel on flat roofing for two primary reasons.

A built up roof bur sometimes called a tar and gravel roof is a tried and true style of flat roof. 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. We used on a flat roof bitumen mastic to plug a hole we then painted with a water proof roofing paint. There are different types and weights of gravel used on flat roofs for these purposes.

The stones force it to stay put. Stone is also used as a ballast for single ply membrane roofing. 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. What are tar gravel roofs or built up roofs.

This is the protective cover that keeps the layers of tar and bitumen from deteriorating in the weather. But as said the stones help the roof from bubbling etc from the sun. Specifically there are two main reasons to use a ballasted roof system. 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.

On more expensive mebrane rooves you dont need pebbles. 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. Having a large flat roof this is something that i pondered on too. The gravel prevents sun hail errant baseballs etc from damaging the membrane the all important moisture seal created by the tar paper and tar.

Built up roof bur the traditional hot tar and gravel. 2 to break up the rain into fine mists and keep the noise level down. All three types of flat roofing cost 250 to 350 per square 100 square feet but prices vary according to region and size of the roof. There are several reasons flat roofs have stones.