BUR: A Popular Option to Reinforce Flat Roofs

A building with a flat roof requires additional maintenance, as well as an increased chance of a leak. To help minimize that from happening, it is worth insulating it with a gravel roof. Called a BUR system, it is a method of building up the roof that has been a go-to option since the 1800s.

Assessing the Damage

The BUR roofing method involves applying layers of bitumen, an oily organic substance, with a reinforced felt gravel cover. The bitumen, also referred to as tar or asphalt, has been proven to be an excellent sealant. When combined with the layered BUR system, it insulates, protects against harmful UV rays and keeps the roofing material in place. Flat and sloped roofs both benefit from this type of built-up membrane. Along with providing a layer to keep leaks out, it reinforces the roof against wind, hail and fire damage. It also helps keep the roof cool, which may help minimize energy costs. In most cases, the gravel roof will be applied in multiple, alternating layers for maximum protection.

The Lifespan of a Built-up Roof

While there are many factors that determine a roof’s longevity, a built-up roof typically lasts 10 to 20 years. The amount of BUR layers plays into that. A roof with three layers may provide protection for up to 15 years while four layers often mean counting on your roof to last 20 years. Those estimates do require that the roof is properly maintained. Since roof damage is often a hidden problem, it is recommended to have a flat roof professionally inspected every year.

While the flat roof on your property may give it a unique look, it means a high-maintenance roof that is prone to issues if not properly taken care of. A BUR system with a gravel roof is a proven method to add layers of protection to maximize the longevity of your roof.