Why Is Gravel On Roofs

Of all the flat roofing options a tar and gravel roof is the most economical.

Why is gravel on roofs. Tar and gravel flat roofs are one of the most cost effective roofing solutions. Gravel is an excellent fire retardant. To protect the underlying layer of roofing materials as is the case with built up roofs burs. Tar has a low melting point.

Now that you know why gravel roofing is often a preferred choice we will now move onto what a bur roof is. Built up roofing bur was the most common type of flat roof before modified bitumen and membrane roofing were developed. Top problems with tar and gravel commercial roofs added weight to structure. Contractors and builders use gravel on flat roofing for two primary reasons.

Gravel roof advantages most gravel roofs are inexpensive to build offer some protection to vulnerable asphalt against uv damage and the stones are very durable. It is made up of alternating layers of roofing felt or fiberglass and asphalt that is applied with heat. Built up roofs or burs also called a tar and gravel roof are a style of flat roof. 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.

These materials provide the waterproof barrier that contains and sheds the water to protect the roof structure. However both rubber and asphalt will lose plasticizers and other v. 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. Have you ever wondered why contractors install gravel on flat roofs.

It provides excellent protection against uv rays and is an attractive option for windows and decks that overlook the roof. Therefore you can save money in the long run. Also a tar and gravel roof is very rugged and safe to walk on. Gravel roof disadvantages on the other hand gravel roofs are hot energy inefficient heavy moisture trapping and unstable.

Bur consists of many layers. A bottom layer or two of insulation board multiple intermediate layers of tar or asphalt alternated with layers of roofing felt and a top layer of gravel. A tar and gravel roof has a life expectancy of about 20 to 25 years. Tar and gravel roofs add substantially more weight to the building structure.

Per square in heavier than before. Gravel is used on flat roofs for two reasons. Advantages of a tar and gravel roof. To weigh down or secure the roofing material as is the case with single ply flat roofs.

What is a built up roof bur. A flat roof typically has a rubber or asphalt impregnated membrane.