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FLAT ROOF DRAIN INSTALLATION. Complete step by step instructions by the pro’s at ALL TECH Plumbing show you a roof drain installation of a Zurn Z100 large 15″ cast iron roof drain using their custom fabricated superior grade roof drain pan.
The jobsite: This roof drain was installed on a 3 story commercial building. The existing roof drain was incorrectly installed and causing water damage to the structure and was not installed in the actual low spot on the flat roof thereby causing huge pools of standing rainwater.
To correct this situation, ALL TECH Plumbing had to….
Step 1 find the actual low spot on the roof.
Step 2: remove the existing roof drain. This step shows how to remove the existing roof drain and shows the incorrect methods used to install the roof drain.
The original installation was not done by a seasoned plumber, rather, was done by a someone with a lack of knowledge and expertise in the trade. This resulted in property damage.
The technique used however to try and “sump” or lower the roof drain was the only technology available. This entailed building a “wood sump box” which you see in the video.
Step 3: Shows how the labor intensive and clumsy “wood sump box” were now replaced by the modern, sleek and easy to install sheet metal sump pan. A major time and materials saver.
Step 4: Cutting the hole in the roof to receive the sump pan and roof drain. A fast and simple process.
Step 5: Assemble the roof drain to the sump pan.
Roof drain sump pans should be purchased with your cast iron roof drains to prevent rainwater from building up on your flat roof.
This does not mean a “sump receiver”.
The difference between the two is that the sump receiver has no “sump” feature engineered into, leaving the roof drains level or higher than the roof. This can create large pools of standing rainwater.
The roof drain sump pan sold by Roof Drain Pans Co has a patented “sump” feature engineered into it design. This patented design lowers the roof drains.
“Sumping” roof drains is vital whether you are lowering existing roof drains or a doing a roof drain installation with new roof drains.
This assures that the roof drains are lower than the surrounding flat roof and will actually do what they are designed to do which is DRAIN THE FLAT ROOF and eliminate pools of standing rainwater.
BE advised that some retailers selling “roof drain sump pans”. They are sump receivers, not true roof drain sump pans.
On this project, a single story condo roof, the original roof drains were sitting too high to actually drain away any standing rainwater. A “sump receiver” was used on the original roof drain installation.
The standing rainwater damaged the roof covering and caused property damage and had to be replaced.
The property owners decided on the roof drains and roof drain pan system shown and also wanted to be sure that the roof drains were properly sumped to avoid the same problem in the future.
This roof drain installation solved any issues standing rainwater problems that were attributed to roof drains being installed with a sump receiver.
Mounting the roof drain to the roof drain sump pan:
1. Set the roof drain onto the bottom of the roof drain pan.
2. Anchor the roof drain to the roof drain pan by installing four standard bolts, washers and nuts in the pre-drilled holes in each of the four corners of the roof drain.
3. The mounting hardware is included with your purchase
Installing the roof drain pan/roof drain unit:
1. Cut a hole in the roof between the rafters 14 “ square to receive the roof drain.
2. Set the roof drain pan on the flat roof with the “sump” section directly in the 14” hole. Structural framing not required.
3. Secure the flanges with nails or screws on the two sides that straddle the rafters. (not supplied)
You can buy this flat roof drainage system and use it for sumping small roof drains on your future roof drain installation projects. www.shop.roofdrainpans.com. Shipping in the USA and Canada.
Request a roof drain installation estimate in So. Calif or visit our website at www.roofdrainpans.com. Call and speak to a plumber at 888 900-9145 with any questions. Free tech support. We’re in the USA.
Click here to see how to a roof drain installation with large roof drains with their large roof drain pan. https://youtu.be/J4qHlqj3vgU
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