River Rock Flate Roof

Ballast stone traps a lot of dirt making patching difficult.

River rock flate roof.

Roofs with pavers as ballast can be used as outdoor patios. To protect the underlying layer of roofing materials as is the case with built up roofs burs. They can be partially loose laid and held down with river rock ballast requires roof structure to support the weight or fully adhered to the roof deck. The loose laid layers in a ballasted roofing system are easily taken up making for easy repair.

There are different types and weights of gravel used on flat roofs for these purposes. Grey caribbean river pebbles model rfgcrp3 30 26 00 26 00. Tar has a low melting point. And at the end of the roof s.

Gravel to protect built up. Set your store to see local availability add to cart. To 3 in 30 lb. Membrane roofs are attached in a variety of ways.

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. Gravel is used on flat roofs for two reasons. But such a low slope holds snow and water much longer than a steeply pitched roof and therefore needs a very different material to stay watertight. Adds a lot of weight to the roof system typically 10 15 pounds per square feet.

In a typical tar and gravel roof which by the way is gradually being supplanted by gravelless roof systems you put down a layer of tar paper then tar and finally gravel. Epdm and neoprene roof seams are fastened by adhesive and pvc roof seams are heat or solvent welded. Flat roofing is not actually flat. The roof tends to flex a little better under the expansion and contraction of heat and cold making it a bit more durable.

Drawbacks of a ballasted roof system. Extremely difficult to find a leak in this system since the membrane is well hidden. Stones or concrete pavers protect the waterproofing layer from uv rays hail and foot traffic. To weigh down or secure the roofing material as is the case with single ply flat roofs.

Talk to ten roofing contractors and you ll get ten answers on what the gravel is for but this seems to be the consensus. Built up roof bur the traditional hot tar and gravel. Arizona river rock model arz 40 22 98 22 98. 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.