Purpose Of Gravel On Gravel Roof

First it is meant to protect the underlying layer of the materials used for built up roofs bur.

Purpose of gravel on gravel roof.

Gravel to protect built up. Generally the weight for a gravel coated roof must be within 10 25 pounds per square foot. Therefore you can save money in the long run. Disadvantages of a tar and gravel roof.

Built up roofs or burs also called a tar and gravel roof is a well established and popular style of flat roof that is made up of alternating layers of roofing felt or fiberglass and asphalt that is applied with heat which combine to make a long lasting sturdy roofing system. Too much gravel can result in a structural issue due to weight. A tar and gravel roof has a life expectancy of about 20 to 25 years. Tar and gravel flat roofs are one of the most cost effective roofing solutions.

Friday july 6 2018. A flat or low slope roof is often not a suitable surface for shingles or other roofing materials because moisture can t flow off them. Contractors place gravel on roofs for two major reasons. The standard roofing for this situation is built up from layers of hot tar and thick roofing felt and topped with a layer of gravel.

Most houses with flat or nearly flat roofs are topped with built up roofing or tar and gravel roofing made from fiberglass based asphalt sheeting that is applied in layers with hot bitumen tar mopped on between. Gravel provides shade to the top layer of asphalt tar protecting it from the ultraviolet rays in sunlight. To weigh down or secure the roofing material as is the case with single ply flat roofs. Pea gravel crushed rock and decorative rock white quartz are often dispersed into a flood coat of hot asphalt and applied over the top of the roof membrane.

Uv rays speed up asphalt deterioration and cracking when the asphalt is directly exposed to sunlight. To protect the underlying layer of roofing materials as is the case with built up roofs burs. This is called built up roofing. Our experience is that most gravel roofs are 3 ply hot mopped asphalt built up with a gravel finish applied.

Gravel is used on flat roofs for two reasons. One solution to this is a built up or tar and gravel roof where many layers of hot asphalt or bitumen tar paper and a waterproof membrane are applied and then covered with gravel. Second contractors place gravel on single ply roofs to allow the roofing materials to remain weighed down and secure. A tar and gravel roof is very heavy.

What is the purpose of the gravel on a flat tar roof. A tar and gravel roof will generally last around 20 years although if they are well maintained and properly installed this kind of roofing has been known to last almost 40 years. Aside from its low installation costs the roofing material does not require frequent repairs or replacement.