Which Of Following Is A Function Of The Roof Ballast

Decking materials performance requirements.

Which of following is a function of the roof ballast.

Contribute to air circulation under the roof membrane which material would you be least likely to see being used as roof deck. When the concept first came to the u s plenty of roofers scratched their heads and wondered how the roof stayed on without being anchored especially during high winds or storms. It is however ballasted generally with gravel. Built up roofing system in roofing applications ballast can perform all of the following functions except contribute to air circulation under the roof membrane.

The ballast is used to keep the roofing system cool and of out of the sun s harmful rays thus keeping energy costs down. Roof membrane roof ballast if needed drainage flashing. Because the ballast stones are loose laid and not embedded into a layer of tar asphalt the gravel is easy to move when conducting repairs or maintenance. Despite the positive qualities associated with a ballasted roof system there are some challenges.

In roofing applications ballast can perform all of the following functions except. A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material. Although single ply roofs inherently have sun protective qualities ballast provides an extra layer of protection from uv rays. Ballast also protects against hail and from foot traffic during repair or maintenance work.