Flat roof options


I have an old garage building with a flat roof made of concrete. It leaks a little bit. On part of it there is an asphalt coating and on some parts you can see the bare concrete. It is structurally sound.
I've talked at times to several roofers to see what should be done.
One roofer suggested a rubber roofing but that is a pretty big deal and expensive and I'd think overkill.
The simplest and cheapest solution is just a coating of some sort which is what I'd like to do. What kind of experience/experience to people have with this? And are there some recommendations on types of coating.
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John W Gintell wrote:

Use an elastomeric coating but do an adhesion test first. Couple of applications of this product worked well for our garage roof. I think you can roll it on but we used a sprayer for the sake of time. It's holding up well. Was available at home dep. when we did it 2 years ago.
GL
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John W Gintell wrote:

Just put on a new coat of asphalt overtop ... and small stones. Now if I could just remember what purpose those stones serve ???
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bowgus wrote:

Don't use asphalt...there are a ton of great hi-tech roof coatings... here's one: http://www.koolseal.com /
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Mainly to protect the asphalt from the sun, I think.
Don Young
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Aha ... I knew this :-) ... "With conventional tar and gravel roofing the tar is covered with a thin layer of gravel to protect the tar from the harmful ultra violet rays of the sun. Contrary to popular belief it is not water and rain that are responsible for the majority of the damage to roofing products, it's the constant exposure to the sun which, in the case of your type of roof, rob the tar of solvents which cause it to become brittle, crack, or blister.
Another popular way to protect a built-up roof from the sun is with the application of an aluminum coating in lieu of the gravel. However, according to roofing experts this method doesn't offer the roof the level of protection from the sun that gravel does. Unlike the gravel, which will not deteriorate unless eroded by excessive wind and rain, the aluminum coating will only last five to seven years before an additional application is required where the conventional tar and gravel roof should last somewhere in the neighborhood of fifteen years. We suggest that you go with the gravel."
Ref ... http://www.onthehouse.com/qa/37
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