What is the reason for this.
Reason for rocks on roofs.
The rocks gravel serve several purposes.
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There are different types and weights of gravel used on flat roofs for these purposes.
It is very important to note that the amount of gravel being applied to a roof must be precise it depends on the specific roofing spec being used and the building type.
There s actually a couple reasons for rocks on the roof.
They hold down the tar roof by their weight they prevent uv damage and erosion of the tar and asphalt paper and limit debris that can stick to it.
The shingle manufacturer provides specific areas where the installer is required to fasten the nails and if they are not careful while doing their work you may end up having roof shingles that are nailed too high and face the risk of them not being caught adequately by the nails making them less wind resistant.
Generally the weight for a gravel coated roof must be within 10 25 pounds per square foot.
The gravel prevents sun hail errant baseballs etc from damaging the membrane the all important moisture seal created by the tar paper and tar.
One is to hold water and let the sun heat up the rocks and evaporate the water another to protect the roofing from uv rays which will help the roof last longer and there is also an architectural look that is achieved when building green roofs.
Incorrect installation is often the primary reason roof shingles get blown away.
Too much gravel can result in a structural issue due to weight.
Some buildings have have rocks on the roof of it.
Rocks gravel are for ballast weight to hold the roofing material on and to reflect heat and sunlight to prolong the life of the roof.
Having slate tiles prevent owners from replacing their roofs every 20 to 30 years for it can reach up to a hundred years with proper installation and regular maintenance.
Rocks break up snow and ice to prevent injuries from the snow and ice sliding off the roof when the temperature warms up.
No picnicking or grilling on the grounds vehicle roofs or hoods please.
That s all there is to it.
Gravel is used on flat roofs for two reasons.
To weigh down or secure the roofing material as is the case with single ply flat roofs.