Why Do You Put Rocks On A Flat Roof

The purpose of gravel on a flat roof.

Why do you put rocks on a flat roof.

Gravel is used on flat roofs for two reasons. Why do they put gravel on flat roofs. Rocks are placed on commercial flat roofs for many different reasons if the roof is what is called a ballast roof it is not fastened or adhered down throughout the whole roof. Specifically there are two main reasons to use a ballasted roof system.

The gravel can be applied in far less time than using a specially. The membrane is. Ideally the stones are river gravel which has smooth edges and won t cut into the roof when somebody walks around on it. I assume you re not talking about rocks meaning boulders but rather the layer of small stones you see not just on gas stations but on many flat roofs.

Do not apply coating to a badly worn or dried out roof. Do not apply fabric membrane to a gravel roof. When you should not choose a tar gravel roof. So all you need to be able to say to your roof contractor is you want an epdm rubber roof.

While tar and gravel roofing or built up roofing systems have many positive aspects if you live in an area or the roof is in a location where it will receive strong sun exposure hot tar roofs will likely damage the roof s membrane if it is left uncovered or unevenly covered by the gravel. The rolls are applied to a completely cleaned stripped roof deck that has been coated in adhesive. This is still the case for the primary or base roof. These roofs are installed as thin sheet materials 0 030 30 mils to 0 060 inches 60 mils thick and are applied to the roof in a single layer.

On many flat roof low slope commercial buildings it s common to see gravel on top of the roof. Both factors can extend the life of your flat roof. For many years the only way you could cover a flat roof was with rolled rubber roofing. Avoid applying coating to roofs that need repairs fix these first.

Have you ever wondered why contractors install gravel on flat roofs.