Bur consists of many layers.
Gravel flat roofs.
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.
It also provides protection from foot traffic.
Our roof gravel is available for delivery in tunnel lift bulk bags allowing an easy method of transporting the gravel onto a roof using a crane not provided.
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.
Gravel to protect built up.
Gravel flat roofs and pea shingle flat roofs.
There are different types and weights of gravel used on flat roofs for these purposes.
As protection the stones absorb some of the sun s.
It provides excellent protection against uv rays and is an attractive option for windows and decks that overlook the roof.
Also a tar and gravel roof is very rugged and safe to walk on.
For many people the built up roof is what comes to mind when they think of flat roofs.
Gravel and pea shingle have two primary purposes on a flat roof.
Built up roofing bur was the most common type of flat roof before modified bitumen and membrane roofing were developed.
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.
To weigh down or secure the roofing material as is the case with single ply flat roofs.
Gravel roof disadvantages on the other hand gravel roofs are hot energy inefficient heavy moisture trapping and unstable.
As ballast the gravel will help anchor the material underneath and lower the risk of it being blown off in high winds.
To protect the underlying layer of roofing materials as is the case with built up roofs burs.
Built up roof bur the traditional hot tar and gravel roof is built from three or more plies of waterproof material alternated with hot tar and ballasted by a layer of smooth river stone.
Roof gravel provides a protective layer to flat roofs reducing the weather damaging effects from uv rays and heavy snow hail and wind.
Gravel is used on flat roofs for two reasons.
Of all the flat roofing options a tar and gravel roof is the most economical.
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.
Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot.
Gravel is an excellent fire retardant.
They provide a loading coat and they afford uv protection.
Built up flat roof replacement.
