Why Are There Rocks On Flat Roofs

Ideally the stones are river gravel which has smooth edges and won t cut into the roof when somebody walks around on it.

Why are there rocks on flat roofs.

Rocks are placed on commercial flat roofs for many different reasons. Talk to ten roofing contractors and you ll get ten answers on what the gravel is for but this seems to be the consensus. A few weeks ago my wife and i were driving to gubbio and were amazed ath the number of roofs that had large rocks strategically placed on them anyone know why this is done. Fine gravel on a conventional built up roof bur is provided for uv protection of the roofing bitumen and as a wear cour.

Because the gravel holds and releases heat the layer of gravel on a bur flat roof can both help water evaporate and. The gravel also acts as a protective measure to prevent natural debris such as leaves. If the tar dry s out. Flat roofs on commercial buildings are not perfectly flat.

The gravel provides a better grip for foot traffic when conducting maintenance or repairs. The rocks are on top of tar the tar keeps the roof from leaking but the small stones are there to protect the tar and hold moisture so the tar does not dry out completely.