Feb 14 2023, 02:39 PM Bởi: jrofer

Built-up roofs are one of the top choices for flat and low-sloped buildings. The insulation sheets increase a home or building’s energy efficiency, while the aggregate at the top of the roof is fire resistant.

The alternating layers provide a tight seal that protects against water leaks.

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The average built-up roof will last from 15-30 years, but if well maintained and in an area with a mild climate, it can last for up to 40 years.

Factors that decrease the time a BUR will last include cold and snowy climates, air conditioning units that sit on top of the roof, and pooling water.

To maintain a BUR roof and increase longevity, ensure proper drainage and deal with pooling water as quickly as possible.

You should inspect a BUR at least twice yearly to look for cracks, pooling, blistering, split joints, and other signs of damage.

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At a basic level, built-up roofs have at least three materials: ply sheets, layers of bitumen or asphalt, and a surfacing material like stone or gravel.

A modern BUR’s base is thick roof insulation with a cover board. On top of the board are alternating layers of bitumen and ply sheets, such as roof felt.

The bitumen can be “cold,” which means an adhesive application, or “hot” applied with a torch. The top layer is a surface material such as small stones or gravel.

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Some BURs, especially in commercial spaces, have a UV layer under the aggregate for heat resistance.

Modified Bitumen is asphalt combined with additives such as rubber or plastic and reinforced with fiberglass. It comes in rolls; you can apply it to a roof with heat, adhesive, or self-adhesive membranes.

Modified bitumen is flexible and waterproof, making it ideal for flat and low-sloped roofs.

Like BUR, modified bitumen can also be applied in a multi-layer fashion or in two layers. Modified Bitumen is easier to DIY, while BUR requires professional installation.

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Built-up roofing systems tend to last longer than modified bitumen. But, both materials are durable and efficient for flat and low-sloped roofs. If you’re not sure which is better for your structure, consult with an experienced contractor.

Conclusion

Swadley Roof Systems offers the best roofing services in the Houston, Austin, San Antonio and Dallas area.