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Built Up Roof, The Commonest Type Of Flat Roofs

In reality, there cannot be a literately flat roof because it will not drain any water. When it rains, the water will remain there until when the roof begins to leak. So, what is being referred to as flat roof is actually low-sloped roof. It is not as sloppy as the pitched roof. Actually, flat roofs usually have about 10 degrees slope.

Built up roofs are flat roofs designed to offer fantastic waterproof protection.

The commonest kind of flat roof is built up roof. Even though it is also referred to as hot-tar-and-gravel roof, tar is no longer in use. Instead, asphalt built up roof is now the order of the day. This is because asphalt lasts longer than hot tar.

Some of the benefits of built up roofs are outlined below:

Since flat roofs drain water less than pitched roofs, water stays on it a little longer. So, built up roofs offer fantastic waterproof protection. This helps to prevent leaking. It also protects the building from the ultra-violet rays of the sun. Needless to say that UV rays are dangerous to human health.

Another benefit is that it requires relatively low maintenance cost and it can withstand harsh weather conditions. It is very tough and durable. Gravel is a very good fire retardant so built up roofs protect the whole building from being razed down. Secondly, gravel beautifies the siding, deck and the windows of your house.

As beneficial as built up roofs are, they have their own drawbacks. They are quite difficult to install. The difficulty also affects the speed of installation. In other words, they are very slow to install. Secondly, the installation emits fumes and vapors that are harmful to human health.

Even though built up roofs have a very low cost of maintenance, their cost of installation is on the high side. When a built up roof begins to leak, the leaking spot is always difficult to figure out because gravels sometimes clog the scuppers and gutters. Finally, built up roofs are quite prone to water and wind damages.

Common issues with built up roofs are open joints, undulations and cracks.

Open Joint

To repair any open joint, first apply some cement on the opening. Then, you hold it down so that it can stick to the substrate. This method sometimes fails. If it does, then you have to cut a felt and nail it down over the open joint and pour some cement of the nail and then spread some gravel over the cement and allow it to harden up.


To fix this, you need to level up the sunken areas by adding some layers on them. The substrate has to be in perfect condition for you to be able to fix the problem of undulations.


First of all, you need to clean the area and then add a coat of asphalt cement to it.

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Ronson QuintoRonson Quinto

My Florida Roofing was phenomenal, always on time and detail oriented. Very knowledgeable on the different types of roofs and options. Felix and Maria, picked up the phone immediately and always answered my questions. The owner Rene was on site frequently looking over the job. They were also the best priced and were even recommended by other roofing companies. Very happy with the outcome.

Lynne JohnsonLynne Johnson

I definitely had a 5 Star experience with My Florida Roofing Contractors; and would HIGHLY recommend them to anyone who values working with an exceptional team of professionals. I needed a roof replacement and from the beginning, I found Felix Bello to be knowledgeable, responsive, client-focused, patient, thorough and a person of integrity. As I worked with other members of the team, like Maria Lopez, I learned these qualities were mirrored throughout the organization. What a great culture and excellent experience as a client.

I was consulted and kept informed of every stage of the process, no surprises!

That’s HOW they do business and WHAT they delivered was equally paramount and impressive. The installation was timely and everything passed inspections, no rework. The roof looks amazing, which has been validated by multiple compliments from neighbors. This was an outstanding experience with an outstanding outcome. A great return on investment—there aren’t enough of these! Thank you in spades!

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Your Roof is Our Passion. Let Us Assist with Your Next Roofing Project.

Family Owned & Operated for Over 15 Years. Call Us Today! (772) 206-4506