Common Tar and Gravel Roof Problems
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Get Solutions For Common Roof Problems Associated With Built Up Roofing
Tar and gravel roofs, commonly called built-up roofs, are on many commercial buildings. For some time it was a very popular option for buildings with a large, flat roof. Today there are more roofing materials to choose from, so building owners have to carefully weigh the pros and cons of each.
The tar and gravel roofing technique has been around for decades, but there are some common problems associated with built up roofs that can be a significant drawback. You'll want to discuss common issues with a roofing contractor to figure out how likely they are to occur on your roof and how problems can be prevented.
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Common Problems With Tar and Gravel Roofs
A flat roofing system can be more complex than a pitched roof. Everything must be installed just right and maintained well or roof leaks could quickly form on the flat surface. However, that isn't the only thing to watch out for with a tar and gravel roof. There are a number of common problems that you may experience with a tar and gravel roofing system.
Cracking
As the tar ages it will become more brittle and likely to crack. These cracks leave the deeper layers exposed to moisture and leaks can form.Shrinking
Shrinkage is another common issue with tar and gravel roof systems that can occur as the material ages. It's also a bigger issue in areas that experience swings in the temperature. Shrinkage is the result of the material losing its elasticity. This happens over time, but the process can be accelerated if the roofing material is installed incorrectly or is exposed to the elements.
When the roofing materials shrink it often has a domino effect. The contraction of the materials can pull at the flashing. The loosened flashing can then cause roof leaks to form.Loose Gravel and Roofing Materials
The gravel that creates the protective barrier of a built up roof can come loose over time. With the gravel gone the tar underlying layer is exposed to UV rays and moisture.Water Pooling
Built up roofing systems are often used for structures with a low slope or flat roofing system. Just as with TPO and EPDM, if the material isn't installed properly it can easily cause the roof surface to be uneven. Even slight dips and grooves allow water to pool and increase the likelihood of a leak. Adding to the issue is the fact that built up roofs are among the most complex to install.Heavy Weight
Unlike single ply flat roofs, built up roofs are made of layers of material. Usually there are 3-5 layers that alternate between asphalt and either asphalt-embedded felt or fiberglass. If it gets layered on too much the weight of the materials can cause a strain on the roofing and structural system.

Fixing and Preventing Problems With Tar and Gravel Roofing Systems
If you are going to get the longest lifespan out of your tar and gravel roof, the issues above have to be dealt with in a timely manner, or even better, prevented all together. Even though you can't stop materials from aging, you can impact how they age over time.
Roof Inspections and Maintenance
The best way to avoid roof repair is regular roof inspections and maintenance. Flat roof systems need regular monitoring to watch out for water pooling that may not be obvious from the ground level. You also need to get an up-close look to see how well the top layer of gravel is holding up.
Be Careful With Roof Repairs
The unique challenge with built up roofing is the weight. You can't just add on another layer when repairs are needed, and that often isn't the best option anyhow. Today, there is spray foam and silicon roof coating that can be used rather than re-saturating the roof with more gravel.
Work With a Qualified Roofing Contractor
Because tar and gravel roofs are more complex than other types of roofing systems, it's crucial that any roofer you work with be highly experienced at working with the material. The layers of the roofing material can make repairs a challenge.
LOA is a roofing contractor that's experienced in replacing, installing, repairing and maintaining built up roofs. Give us a call at 512-375-3654 if you own a building in the Austin, TX area that's in need of our roofing solutions.
