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