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Roof leak question...DIY

Old 04-14-2012, 01:44 PM
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Default Roof leak question...DIY

I have a flat roll roof on my garage. If gets leaks a few times a year. I know the problem is that it's a flat roof and the water will pond.

I have done patch jobs and they hold for a while but eventually it will leak. The ponding water seems to work it's way through whatever patch I do.

I was looking at this Elastomeric stuff. Thick white rubber membrane you roll on. This seems to be what I need to do. Just coat the entire roof.

Anyone have experience with this?
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Old 04-14-2012, 03:43 PM
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Chris I use that Elastosizer stuff on my Keys home, like you I have a few small leaks every once in a great while. I just put another coat of it on a few weeks ago. Home Depot sells it, one hint get yourself a good extension pole with threads and get a 16'' roller. I just poured right out of the 5 gal bucket and rolled it out, I was done in no time flat, I put a second coat on a few days latter. I think it has helped, I know most of my neighbors use it also.
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Old 04-14-2012, 04:02 PM
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How much surface prep do you do? Does it need to be as clean as a boat hull before painting?
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Old 04-14-2012, 07:15 PM
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Originally Posted by ScarabChris View Post
How much surface prep do you do? Does it need to be as clean as a boat hull before painting?
I hosed it off good first, however most of my roof is gravel build up. If it is real dirty I suppose you could brush it with some dish detergent first. I have never seen it lift anywhere, I am more prone to believe that it just wears out. If I recall the directions say to put one coat on let it dry throughly then apply another coat the opposite direction. I am looking forward to getting a good metal roof when I can afford it.
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Old 04-14-2012, 07:58 PM
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I wouldn't do it. I had a house that had it on it and it eventually made the problem worse. It will also eventually leak and if you continue to put new coats on it, it traps the moisture inside and rots more wood throughout the house. If you do choose to use it only do one coat and once it starts to leak again just do a re-roof. It will be cheaper in the long run.
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Old 04-15-2012, 10:05 AM
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Why can't you build in a taper? Making a small change in geometry will do more than all the roof products in the world. Get a couple of bundles of cheap asphalt shingles and put a few down at the furthest point from an edge. Use a level and fashion your roof so it drains and then put the waterproofing down. No roof should pool water.


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Old 04-16-2012, 03:23 AM
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SC, typically, the "laps" are what leak, not the field, I woud "bull and membrane" the laps. The Elastomeric, is really less of a band aid.
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Old 04-16-2012, 10:24 AM
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I agree, put a small pitch and make the water move. You don't need much. You never want to make a ptch material your first means of waterproofing. Try some TPO or EPDM membrane. Installed correctly it will not leak.
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Old 04-16-2012, 10:43 AM
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Yeah I know the lack of pitch is a problem with water pooling. But in SE Florida flat roofs are common and they do pool a little water. I know I need to put a new roof on but I can't do it this year. I was hoping I could put the Elastmeric on and get a few more years out of it.
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Old 04-16-2012, 12:40 PM
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Originally Posted by ScarabChris View Post
Yeah I know the lack of pitch is a problem with water pooling. But in SE Florida flat roofs are common and they do pool a little water. I know I need to put a new roof on but I can't do it this year. I was hoping I could put the Elastmeric on and get a few more years out of it.
Chris
The coating is nothing more than a slightly rubberized paint. I don't think its meant to be used with standing water. Do you have spray on foam roofs down there? My company has one and they thing has held up great the last 12 years.
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Old 04-16-2012, 04:00 PM
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can't you hot tar one of those as well?
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Old 04-17-2012, 04:50 AM
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Originally Posted by FASTFJR View Post
Chris
The coating is nothing more than a slightly rubberized paint. I don't think its meant to be used with standing water. Do you have spray on foam roofs down there? My company has one and they thing has held up great the last 12 years.
They have a special product made for flat roofs with ponding water. It's sup[posed to be a rubberized membrane so I don't know why it wouldn't hold out standing water as long as it bonds well and cures properly.

Never heard of a spray foam roof. And adding a grade to this section of roof is impossible, the AC unit is mounted on this section.

Originally Posted by bellsisland View Post
can't you hot tar one of those as well?
I don't think hot taring is something I can do myself. If I am going to pay someone to work on the roof I might as well have the roof replaced.
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Old 04-17-2012, 05:31 AM
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SC, if you can access your roof, use a 4 x 4 to smack it up from the joist or rafter, once you loosen it, drive a wedge or wedges in the open space you created, then use a hurricane clips to refasten to the joist.

BTW, lay a straight 2 X 4 X 8 across the pond to make sure its at least level, but a very slight crown is better.

When you decide to reroof, go with the new stick down granular roll roofing. Awesome stuff.
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Old 04-17-2012, 05:34 AM
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Originally Posted by ScarabChris View Post
I have a flat roll roof on my garage. If gets leaks a few times a year. I know the problem is that it's a flat roof and the water will pond.

I have done patch jobs and they hold for a while but eventually it will leak. The ponding water seems to work it's way through whatever patch I do.

I was looking at this Elastomeric stuff. Thick white rubber membrane you roll on. This seems to be what I need to do. Just coat the entire roof.

Anyone have experience with this?
We use it on our con-ex boxes (old shipping containers).. flat roof, works great.
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Old 04-17-2012, 05:41 AM
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Originally Posted by DavenFla View Post
We use it on our con-ex boxes (old shipping containers).. flat roof, works great.
That's what I was hoping to hear.
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Old 04-17-2012, 06:22 AM
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Chris, I've never been in there, but you may want to drive up this way (powerline and cypress) and chat with the folks at http://acrylux.com/ Don't know how their product works on flat roofs, but it seems to be what everyone here uses on the white flat tile.

My (cement tile) roof is in perfect shape, apparently every 3 years the previous owners put a coat of this stuff on... for the last 30 years.

This looks promising -"50 year warranty even with ponding water" lol: http://acrylux.com/gacoroof-fall-internet-special/
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Old 04-17-2012, 06:29 AM
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Chris:

As a builder I encounter this all the time. Believe it or not, I'm sold on foam with a GOOD elastomeric coating for a flat roof. I thought it was junk until I saw them go through 3 hurricanes with no damage. I've seen them go 20 years with only occasional maintenance. It also is an insulator so it keeps the interior cool. Our business landlord, who owns/manages many high end commercial properties, uses this exclusively on flat roofs, and has for 20 years.

The existing roof is retained, but cleaned and structurally patched if necessary.
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Old 04-17-2012, 08:22 AM
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Originally Posted by ScarabChris View Post
They have a special product made for flat roofs with ponding water. It's sup[posed to be a rubberized membrane so I don't know why it wouldn't hold out standing water as long as it bonds well and cures properly.

Never heard of a spray foam roof. And adding a grade to this section of roof is impossible, the AC unit is mounted on this section.



I don't think hot taring is something I can do myself. If I am going to pay someone to work on the roof I might as well have the roof replaced.

Wow, I thought spray on foam roofs would be huge in your part of the country. It started up here about 15 years ago and really caught on. All the buildings on my industrial park have it for their roofs. The place that did our started out in spraying refrigerated rail road cars.

http://sprayfoam.com/spps/ahpg.cfm?spgid=7
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