Why Put Gravel On Roof

Tar has a low melting point.

Why put gravel on roof.

The weight provided by the gravel is used to anchor down the roof materials therefore using far fewer fasteners to hold the materials to the decking. Because the gravel holds and releases heat the layer of gravel on a bur flat roof can both help water evaporate and. This roof type is typically composed of overlapping layers of tar paper or rubber sheeting separated by tar. As the roof ages more gravel is released increasing the displacement effect.

Advantages to white coating. The gravel provides a better grip for foot traffic when conducting maintenance or repairs. Walked on gravel tends not to hurt the seal of the tar underneath. I took all the gravel off was necessary anyway full of organic matter and moss checked and patched suspect areas in the tar surface and now i m ready to put the frame and decking wood on top.

In the summer it gets pretty soft and if left to its own devices would flow to the lowest point on the roof. Gravel reflects a great deal of light and on those hot summer days it can keep the tar 15 to 20 degrees cooler than everything else. The layer of gravel on a low slope flat roof is used to help keep the underlay fabric secured and to provide some protection from the elements and human interference. Gravel is heavy and concentrations of gravel can contribute to roof deck deflection low areas.

Specifically there are two main reasons to use a ballasted roof system. I will convert my flat roof into a patio. It provides excellent protection against uv rays and is an attractive option for windows and decks that overlook the roof. The gravel covers a tar roof.

Also the gravel acts as a wick to pull up any water left on the roof after scuppers or gutters lead excess water away. Contractors and builders use gravel on flat roofing for two primary reasons. The gravel also acts as a protective measure to prevent natural debris such as leaves. Of all the flat roofing options a tar and gravel roof is the most economical.

The first is to protect the underlying layer of roofing materials on built up roofs burs and the second is to secure or weigh down the roofing material as is the case with single ply flat roofs. Why put gravel on flat roof. Gravel collects along gravel stops drip edges causing more heat and moisture to be directed against the roof surface causing damage over time. The gravel can be applied in far less time than using a specially designed screw and plate fastening pattern.

It s to protect the roof membrane from damage and to keep it cool. In a typical tar and gravel roof which by the way is gradually being supplanted by gravelless roof systems you put down a layer of tar paper then tar and finally gravel. Walking on the tar would hurt the tar s seal fast. That keeps the tar harder so leaks are less likely.