Flow Control Roof Drain Design

Zurn makes it easy to size roof drains.

Flow control roof drain design.

Standard primary roof drains are designed to drain storm water as quickly as possible. The flowcontrol assembly is secured to the drain body sump area by the clamping ring. If you have heavy runoff from roof downspouts and neighboring properties redirecting or capturing runoff can provide better control. When sizing roof drains the limiting factor for the amount of water each drain will carry away is the size of leader therefore increasing.

50 000 4 400 11 36. Roof drains from large area roof drains and siphonic roof drainage systems to green roof drains balcony drains and roof drain accessories we cover the gamut of roof drainage needs for addressing varying rainfall rates and types of sites. The result is the number of drains needed. The end result is roof drains 6 in.

The following approaches to redirect and capture runoff can be used to control heavy runoff causing prolonged wet areas or yard erosion. Or 12 drains required. Z105 control flo roof drain. Smith raintrol metered flow rate roof drains are designed to provide this control.

Control flo is a method to remove rain water from flat or sloped roofs. Our exclusive dual functional structural deck flange and combination roof drains streamline specifications saving installation time and labor. As with all building materials it is the roofing contractor s responsibility to review product use with a design professional to confirm safety compatibility and acceptance with the roof cover manufacturer as well as local building codes. These techniques will minimize the amount of water that accumulates or that causes erosion in the problem area.

The control flo weir is linear functioning with integral membrane flashing clamp gravel guard and poly dome. Control flo drains the roof at a controlled flow rate at predetermined levels. 1 rate of precipitation. And 4 area handled by each drain.

The zurn z105 15 diameter control flo roof drain for dead level roof construction has a dura coated cast iron body. All roof openings whether they are at the roof drain or at the vent stack should be protected from vandalism. The flow through the roof drain is very efficient directing the water into the drain. Roof drains watts roof drains provide flexible solutions for specifiers and installers in any commercial roof application.

Sizing quantity and location of raintrol roof drains are separate and distinct procedures from those for regular roof drains. 3 size of leader required. These systems are sized for maximum rainfall for the geographical area. Or smaller in size have the ability to flow more water to the piping than the piping can handle using 33 for the vertical and full flow for the horizontal.