Roofing Ballast Definition

Ballasts are loose laid and can consist of aggregate or concrete pavers.

Roofing ballast definition.

Over time the stones move around creating bald spots where the system isn t held down at all. Anything that gives mental moral or political stability or steadiness. Next the membrane is rolled over the insulation 2. For size of aggregate used as ballast for membrane roof systems or paver systems or lightweight interlocking paver systems.

Epdm roof membrane 60 mil ballasted membrane and stone ballast only 10 75 20 lbs. Ballast is used to provide uplift resistance for roofing systems that are not adhered or mechanically attached to the roof deck. 52 5 97 65 kg. 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.

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. In roofing ballast comes in the form of large stones or paver systems or light weight interlocking paver systems and is used to provide. Ballast stone can crush the underlying insulation creating weak spots in the roof membrane. 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.

1 the term used for each row of shingles of roofing material that forms the roofing waterproofing or flashing system. Gravel broken stone slag etc placed between and under the ties of a railroad to give stability provide drainage and distribute loads. The ballast of a steady income. 1075 2000 lbs.

The insulation is loose laid onto the decking. A roof configuration with a partial cylindrical shape to it. A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material. 2 2 conventional ballasted roof system.

A heavy material carried on a vessel to control draft and stability or a balloon to control altitude. Stone ballast is no longer allowed by many building codes. In windy areas ballast stone can actually blow off the roof creating projectiles below. It is however ballasted generally with gravel.

A material installed over the top of a roof membrane to help hold it in place. Fall 2019 crca today 1 5. Epdm roof membrane 90 mil fully adhered membrane only 0 56 lbs. There are no fasteners installed at all 3 and 4.