Roofing Ballast Definition

Stone ballast is no longer allowed by many building codes.

Roofing ballast definition.

The ballast of a steady income. Gravel or broken stone placed under the ties of a railroad. In roofing ballast comes in the form of large stones or paver systems or light weight interlocking paver systems and is used to provide. It is however ballasted generally with gravel.

A heavy material carried on a vessel to control draft and stability or a balloon to control altitude. 52 5 97 65 kg. Epdm roof membrane 60 mil ballasted membrane and stone ballast only 10 75 20 lbs. There are no fasteners installed at all 3 and 4.

1075 2000 lbs. The insulation is loose laid onto the decking. Ballast stone can crush the underlying insulation creating weak spots in the roof membrane. Epdm roof membrane 60 mil fully adhered membrane only 0 47 lbs.

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. A device that maintains the current in an electric circuit at a constant value and may also provide the starting voltage as in a fluorescent lamp. 2 2 conventional ballasted roof system. Anything that gives mental moral or political stability or steadiness.

Epdm roof membrane 90 mil fully adhered membrane only 0 56 lbs. Ballasts are loose laid and can consist of aggregate or concrete pavers. A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material. Over time the stones move around creating bald spots where the system isn t held down at all.

A roof configuration with a partial cylindrical shape to it. Fall 2019 crca today 1 5. For size of aggregate used as ballast for membrane roof systems or paver systems or lightweight interlocking paver systems. Gravel broken stone slag etc placed between and under the ties of a railroad to give stability provide drainage and distribute loads.

Next the membrane is rolled over the insulation 2. 2 one layer of a series of materials applied to a surface e g a five course wall flashing is composed of three applications of roof cement with one ply of felt or fabric sandwiched between each layer of roof cement. In windy areas ballast stone can actually blow off the roof creating projectiles below. The stone ballast on a ballasted roof system is the only thing holding the roof system in place.