Built-up roofing, also known as BUR, is best for low slope roofs, thereby making it a suitable choice for flat roofs as well. It is preferable for low sloped flat roofs because it creates a continuous sealed surface. The BUR system is made of layers of reinforcing fabric and bitumen, with a final layer of stone or gravel. Unlike other roofing materials like PVC, tar & gravel, EPDM and TPO, you can choose the material you want in a built-up roofing system.
BUR systems offer a clean and aesthetically pleasant roofing. In fact, it can handle a lot of foot traffic, making it ideal for both residential and commercial properties. If you have any questions about BUR, this blog can answer them.
What are the various types of built-up roofing?
BUR is not new to the market, but its materials have evolved over time. A modern built-up roof incorporates a firm insulation layer to improve the property’s energy efficiency. It is made from three layers: bitumen materials, ply sheets, and one or more surfacing materials. The quality of these materials varies considerably. The bitumen layer can be applied either cold or hot. The ply used during construction can be quite wide to ensure long-lasting protection. Be sure to tell your roofer whether a single- or double-ply roof works best for you.
The top layer is usually made with small stones and gravel. This layer provides protection against direct sunlight, snow and storm.
Can BUR be damaged? How do I fix it?
- Blisters: Small blisters can be easily repaired by cut them open with a knife to allow them to dry as much as possible. Keep cutting until you find the dry part. Remove the felt from the area and install new felt over it. You can also use a liquid coating if chipping is not available.
- Open Joints: If you need to repair joint cracks, you need to add cement. You can also add felt and secure it with nails or screws. Finish by spreading some gravel on the spot.
- Managing slopes: Is water clogging your flat roof? You can manage it by adding a layer on top of the area. Just be sure that the substrate layer is in proper condition before the patchwork is done. Here is where you need an expert opinion, as getting the slope of the roof correct takes a lot of measurement. Planning to do it yourself? It’s better to get professional assistance from a reliable roofing company.
What are the pros and cons of installing built-up roofing on a flat roof?
Pros: BUR is popular for its excellent waterproofing and ultraviolet protection. In fact, the aggregate layer also makes flat roofs fire resistant. An added advantage of BUR is its ease of maintenance. Therefore, it can save you a lot of money through its lifespan.
Cons: Installing BUR can take a long time. Apart from cold bitumen, installation of this roofing system involves dangerous fumes. Maintenance costs are relatively low, but the installation cost is quite high.
What is the average lifespan of BUR?
That depends on local climate, the materials used and how well you maintain it. However, the average lifespan of built-up roofing is approximately 15 to 30 years. If is properly installed, it can last upwards of 40 years. Built-up roofing works better in warmer than colder regions.
If you are planning to install a new roof or replace an existing one, BUR is a good option. Given that it is apt for a sloped roof, it can be used in both residential and commercial flat roofs. With multiple layers of material and a top layer of stone and gravel, it can withstand a lot of wear and tear. Therefore, if you are worried about installing a new roof, BUR is a great option.
