How to Install a Cast Iron Drain | Torch Down Roofing Guide

On a flat roof, it’s very important to have proper drainage for water to not get trapped. Otherwise it can cause leaks and other major roofing issues. In this video, I’ll show you how to install a cast iron drain on a flat torch down roof.

**Please note that torch down roofing is dangerous and should be installed by a licensed professional. Using an open flame can pose a fire risk and therefore must be handled carefully. Make sure to wear fire resistant gloves when installing torch down roofing.
Keep all flammable scrap and debris at least 10 feet away from the building. A fire extinguisher is needed within 50 feet of anywhere where more than 5 gallons of flammable or combustible liquids or 5 pounds of flammable gas are being used on the job site. No one on a job site can be more than 100 feet away from a fire extinguisher at all times. There must be at least one fire extinguisher for 3,000 square feet of work area.
The full list of OSHA’s Fire Protection and Prevention regulations can be found here: https://www.osha.gov/sites/default/fi...

0:00 intro
0:12 explanation
1:21 make your drain flush with the roofing material
4:40 spray asphalt-based primer on the drain
5:20 install a ‘target piece’ before torch down
6:58 create finger cuts in the target piece
8:46 temporarily install a clamp
9:47 remove the clamp
10:11 install torch down over the drain
12:16 create finger cuts in the torched target patch
15:01 install clamp
15:55 remove clamp and install Polyflash 1C sealant
17:30 install the drain

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This is just one tutorial from our latest series, “Torch Down Roofing Guide,” where we will walk you through every step of the process when installing torch down material on a roof. From low rise to pipe flashing, from the glass base to the granulated cap sheet, we will give you all the details on how to install torch down roofing. So check out the rest of that series in the playlist marked on our channel page!

We are a licensed and insured roofing contractor based in Burbank, CA, so keep that in mind when you watch our videos, as roofing regulations are different across the country.
We service the Los Angeles area, and if you’re looking for a trusted roofer, be sure to contact us today for a free estimate!

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