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Old 08-08-2011, 02:25 PM   #1
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Flat roof drains


Can a flat roof drain be replaced from the rooftop only (no access from underneath)? Is there a way other than using a retrofit drain?

I'm not very knowledgable when it comes to drains, so any info on you could share about a typical installation would be great!

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Old 08-08-2011, 10:30 PM   #2
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Flat roof drains


Yes they sell drains that have expandable seals that you place in the drain pipe and tighten some bolt that expands the bottom. Around here they are about $175.00.

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Old 08-10-2011, 09:58 AM   #3
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Flat roof drains


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Originally Posted by Omegaroofer View Post
Yes they sell drains that have expandable seals that you place in the drain pipe and tighten some bolt that expands the bottom. Around here they are about $175.00.
Omega, that's the retrofit drain he was referring to in his thread. i think he is lookign for an alternative to a retrofit for some reason.



Is the pipe broken or why do you NOT want a retrofit? There is always access from beneath, just requires a new ceiling and/or wall.


FWIW, I stay away from the drains inserts that have the expanding foam seal. I prefer the manual seals like on the Olympic Uflow drains. They cost more money but are removeable.
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Old 08-10-2011, 11:26 AM   #4
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Flat roof drains


Pipe is not broken, but it is standard procedure to replace the existing drain (unless it has been cast in place in a concrete deck). Our local warranty program also prefers retrofit drains be the last resort, so I'm just trying to figure out the reasoning behind it.

I've heard of the u-flow type drains, which seem to be the best retrofit method. Wouldn't these make the pipe size smaller? Do you have to clean or smooth the surface of the pipe where the seal goes?

Have you ever dealt with expandable drain bowls?
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Old 08-12-2011, 09:44 PM   #5
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Flat roof drains


You don't "replace" the drain do you? I mean whos' standard procedure is it to "replace" a drain? Insert sure, I can see a drain insert as a standard, but "replacing" a drain is a lot of work if it aint broke.

yes the pipe will shrink abotu 1/2" at the opening with a U flow. It hasn't been a problem yet for us. I'm less concerned with the restriction of 1/2" than I am with a imporoperly flashed drain bowl.

Most of the time in my proposal we bid to reuse the drain hardware. If the drain hardware can't be reused, as determined at the time of tear off, then I give a line item upcharge in the proposal for Uflow or Marathon universal drain rings and hardware. Universal drain rings work great when the bowl is in good condition and needs no insert. A new clamping ring and bee hive and you're done. No restriction of water flow. However even though they are called universal, there is no such thing as one size fits all; hence the U flow enters into the equation.


Can you provide a link for the expandalbe drain bowls? I have never heard of them.
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Sometimes the savings that comes from doing it yourself can be blown away with one mistake.

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