The color stones on my asphalt roof shingles are flying off like crazy with a bit of black showing.
Why pebbles on roof.
The pebbles act as filters for the roof drains.
Additional benefits of ballast on a flat roof.
There are numerous other benefits of a pebble roof covering.
Ideally the stones are river gravel which has smooth edges and won t cut into the roof when somebody walks around on it.
The shingles have been on for about 10 years.
Pebbles or small rocks spread several inches thick over the outer roof membrane will protect the roof membrane from cracking and peeling due to prolonged sun exposure thereby extending the life of the roof by several years.
You can begin this roof condition assessment at the ground before even looking at the roof itself.
Granule loss on a new asphalt roof loose mineral granules wash down the roof and will appear in gutters and at the ends of downspouts.
A ballast system helps cut roof system application costs as it takes less time to install since sealing the layers together isn t necessary.
The little gravel pieces are red.
Ballasted flat roofs are a popular choice especially for commercial buildings.
This is for a roofing membrane that is not fully adhered to substrate and the pebbles are essentially acting as a paperweight.
Talk to ten roofing contractors and you ll get ten answers on what the gravel is for but this seems to be the consensus.
Roofing ballast is usually the little pebbles you see on a flat ish roof.