In roofing crushed stone crushed slag or water worn gravel used for surfacing for roof covering.
Roof ballast definition.
The following is a list of eligible membranes.
Holes mean roof leaks and roof leaks mean call the roofer.
Somebody walking on the roof will undoubtedly step on the ballast and put a hole in the membrane.
Ballasted roof systems are not really a new concept.
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.
Drawbacks of a ballasted roof system.
When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary.
Ballast is any item having weight that is used to hold or steady an object.
They were installed on roofs even in the early 1970 s.
Everguard tpo ballasted roof systems the selection of membrane type thickness and attachment is the responsibility of the architect engineer owner or roof consultant.
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.
It is intended as a design and installation reference for those individuals who design specify and install ballasted single ply roofing systems.
It is however ballasted generally with gravel.
Extremely difficult to find a leak in this system since the membrane is well hidden.
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.
Ballasted roof systems are simultaneously a roofer s best friend and arch nemesis.
Simply put a ballasted roof is easy to install and basically guaranteed maintenance work for a roofer.
Though ballast roofing systems look very similar to built up roofing systems or bur s there are certain differences.
Adds restrictions on the application of ballasted roof assemblies.
Ballast definition any heavy material carried temporarily or permanently in a vessel to provide desired draft and stability.
1502 1 add a new definition.
A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material.
Adds a lot of weight to the roof system typically 10 15 pounds per square feet.
They look aesthetically appealing and installation is fast and easy.
The current ballast restrictions are understood to have been highly influenced by historic events including.
Gaf everguard roof membranes must be used in roofing systems to be guaranteed by gaf.
Ballast stone traps a lot of dirt making patching difficult.
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.
