Flat Roof Overflow Drain

Shallow sump with bronze dome and 45 degree outlet.

Flat roof overflow drain.

Copper roof drain with overflow horizontal outlet. Flat roofing does not drain naturally like sloped roofs that can rely on the force of gravity to remove water. Cast iron roof drain. 21500 rdg1 roof drain.

There are roof coating products available if there isn t enough slant or slope to accomplish this. Scuppers shall not have an opening dimension of less than 4 inches. Pooling of water on the roof that can eventually lead to leaks or structural damage. Where you have roof drains you are also required to have overflow drains.

Unfortunately there is no way for water to naturally drain away from flat roofs because they are flat. Of course this is a con. Green roof drain overflow drain large sump flange. This causes water to stand which can cause major problems.

When scuppers are used for secondary emergency overflow roof drainage the quantity size location and inlet elevation of the scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by section 1611 1. Cast iron roof drain with 2 in. 24500 35 roof drains. Shallow type sill drain with flat grate.

24500 45 sill drain. Green roof type with perforated standpipe. Our exclusive dual functional structural deck flange and combination roof drains streamline specifications saving installation time and labor. Roof drains watts roof drains provide flexible solutions for specifiers and installers in any commercial roof application.

21500 q91 roof drain. Flat roofs that do not drain over the roof edge and roofs that have parapet walls must utilize roof drains to get the water off the roof. Each of these systems has its own pros and cons. Of course the best designed flat roof has the correct amount of pitch to drain the water off naturally.

There are three types of drain systems commonly used on flat roofs. Roof drains from zurn include combination primary overflow control flow dual outlet siphonic retrofit and more which cater from educational to commercial needs. Watts drainage products rd 300 r series 4 in.