There are different types and weights of gravel used on flat roofs for these purposes.
Sand stop for roofing flat.
This type of edge metal is designed for installation on flat rubber roofs with gravel.
Flat roof replacement options.
Manufactured from 0 040 aluminum and perforated on its face side with 3 16 holes staggered centers allows a 50 open face area without greatly affecting the strength.
It provides excellent protection against uv rays and is an attractive option for windows and decks that overlook the roof.
These are mixtures of sand perlite or other lightweight aggregates combined with asphaltic material.
Gravel to protect built up roofs.
A built up roof bur sometimes called a tar and gravel roof is a tried and true style of flat.
Of all the flat roofing options a tar and gravel roof is the most economical.
To weigh down or secure the roofing material as is the case with single ply flat roofs.
Gravel is an excellent fire retardant.
This type of application is ideal for flat roofs made of asphalt metal or concrete.
Dynaclad edge gravel stop system incorporates the same continuous 22 ga steel or 040 aluminum cleat for ease of installation and proper positioning and is pre punched with fastener holes 12 o c.
Just enough slope to drain water but also flat enough to be a problem if not constructed properly.
It features an angled bend at the top known as the gravel stop.
On the face and 6 o c.
Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot.
Flow thru gravel stop ftgs ftgs is our oldest solution for retaining ballast stone on a single ply roof while allowing water flow off.
You can also read this post about what factors you should consider before making a flat roof.
The gravel stop system incorporates a standard 3 deep 90 roof flange that easily accepts stripped in.
Its main function is keep water and gravel from washing away from the edge of a building structure.
We love the flexibility of a flat roof for certain design limitations but they have a bit of reputation for leaks and repairs.
Also a tar and gravel roof is very rugged and safe to walk on.