Roof Ballast Definition

Ballast definition any heavy material carried temporarily or permanently in a vessel to provide desired draft and stability.

Roof ballast definition. Extremely difficult to find a leak in this system since the membrane is well hidden. A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material. Gaf everguard roof membranes must be used in roofing systems to be guaranteed by gaf. For ballasted single ply roofing systems approved august 5 2013 page 2 1 0 introduction this standard provides a method of designing wind uplift resistance of ballasted single ply roofing systems.

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. They were installed on roofs even in the early 1970 s. Ballasted roof systems are not really a new concept. Everguard tpo ballasted roof systems the selection of membrane type thickness and attachment is the responsibility of the architect engineer owner or roof consultant.

The current ballast restrictions are understood to have been highly influenced by historic events including. 1502 1 add a new definition. Drawbacks of a ballasted roof system. Holes mean roof leaks and roof leaks mean call the roofer.

Ballast is any item having weight that is used to hold or steady an object. They look aesthetically appealing and installation is fast and easy. Though ballast roofing systems look very similar to built up roofing systems or bur s there are certain differences. In roofing crushed stone crushed slag or water worn gravel used for surfacing for roof covering.

Roofs with pavers as ballast can be used as outdoor patios. Somebody walking on the roof will undoubtedly step on the ballast and put a hole in the membrane. To look at it another way the ibc is a cookbook that must be followed and ansi spri rp 4 is a single recipe included within that book for ballasted roofing specifically. Adds restrictions on the application of ballasted roof assemblies.

When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof. The following is a list of eligible membranes. In roofing ballast comes in the form of large stones or paver systems or light weight.

It is however ballasted generally with gravel. Ballast stone traps a lot of dirt making patching difficult. Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer. Adds a lot of weight to the roof system typically 10 15 pounds per square feet.