BUR (Built up roofing) or a “tar and gravel” roof is one of the most common types of flat or very low-slope commercial roofing systems. It is comprised of several coats of bitumen and distinct types of reinforcements. BUR systems have been utilized in commercial construction for more than a century thanks to their endurance, the opportunity to be adapted for specific applications, and cost-efficiency compared to other kinds of construction materials. For those in Lafayette, IN, call Core Values Constructions. Our office number is (517) 260-3957.
Built up roofing Construction
To describe the construction of Built up roofing systems, you begin at the roof deck, which is commonly concrete, metal, or wood.
A base sheet is then attached to the roof deck by use of either mechanical fasteners or by applying asphalt.
Then two layers of hot asphalt or coal tar are interlayered with reinforcement layers. These reinforcements are fiberglass mats or organic felt sheets.
The asphalt/tar combination provides the role of waterproofing, and aids in bonding the reinforcements, which offer strength and support.
The number of layers can be changed according to the needed density and fire resistance, normally 3-5 layers are applied. This is subsequently layered with a protective layer of aggregate; aggregate like gravel or mineral granules protect the surface from UV and impacts.
Benefits of BUR Systems
- Very long-wear for the roofing system. It can reach 30 years or more in case of regular maintenance.
- Adaptable: The number of layers and materials can be altered for climate or budget.
- Self-applied for low slope roofs
- They can have high fire resistance based on construction.
- Comparatively, low material costs
Potential Drawbacks
- Needs specialized equipment and human resources for its installation.
- Some buildings may require the use of reflective coatings especially when used in warm climatic conditions.
- Gravel surfaces may tend to crack up with time.
- Tearing off and replacement is slightly more difficult than applying a conventional roof.
- All fumes emerging from the hot asphalt need to be adequately ventilated.
Built up roofing Experts
Although built up roofing requires more effort to be put into place correctly, the longevity and strength of these systems make them ideal for many forms of commercial and industrial structures with flat roofing systems. After installation, re-coating and checking for any leakage or damage is especially important so that the life of BUR system can be extended to the maximum. If you have a built-up roof or are looking to have one for your building in Lafayette, IN, contact Core Values Constructions on (517) 260-3957.