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Old 12-28-2013, 10:00 PM   #1
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What type of roof do I have?


About four months ago we had a very small leak coming into our living room. I got some Dewitt's wet stick cement & patched what looked to be some open seams on our flat roof, problem solved...until a couple of nights ago.

I decided to do some research and have learned that the cement to be used is determined by the type of roof you have. I always assumed that flat roofs were basically tar. But I see here that it's important to know whether I have a TPO or EPDM etc.

How do you guys figure out what type of material was used in the construction of your roof? Any help would sure be appreciated.

Steve

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Old 12-28-2013, 10:11 PM   #2
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What type of roof do I have?


Look and feel like a black inner-tube? EPDM
Look and feel like a gray or white plastic? TPO, or maybe PVC
Very firm, stiff and look like rubber but feels like it's as flexible as stone? APP Mod-bit.
That's just a teaser into knowing what you're looking at and even then, some might be wrong.

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Last edited by tinner666; 12-29-2013 at 08:12 AM.
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Old 12-29-2013, 02:01 AM   #3
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What type of roof do I have?


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Look an dfeel like a gray or white plastic? TPO, or maybe PVC
Very firm, stiff and look like rubber but feels like it's as flexible as stone? APP Mod-bit.
So TPO is always white or gray?
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Old 12-29-2013, 07:25 AM   #4
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What type of roof do I have?


Posting a picture may help.
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Old 12-29-2013, 08:13 AM   #5
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What type of roof do I have?


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So TPO is always white or gray?
Nope. Just two examples. Pix would help.
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Old 12-29-2013, 08:16 AM   #6
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What type of roof do I have?


Some EPDM is white but will show black through the white when it gets old and wore out.
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Old 12-29-2013, 12:32 PM   #7
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What type of roof do I have?


Let me know if this helps or if you need more pics.

Also, can I confirm if this is a single ply membrane from this photo?
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Old 12-29-2013, 12:54 PM   #8
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What type of roof do I have?


That looks like 3 buckets of roof cement covering something. Need more pix.
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Old 12-29-2013, 01:12 PM   #9
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What type of roof do I have?


This should be a little better
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What type of roof do I have?-doc-dec-29-2013-12-58-pm-p1.jpg   What type of roof do I have?-doc-dec-29-2013-12-58-pm-p2.jpg   What type of roof do I have?-doc-dec-29-2013-12-58-pm-p3.jpg   What type of roof do I have?-doc-dec-29-2013-12-58-pm-p4.jpg  
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Old 12-29-2013, 02:02 PM   #10
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What type of roof do I have?


One side looks like APP that is alligatoring. That's the one with the cement. Fibered coating is what it needs. The roof cement could eat it all away along that break though.
The other looks like EPDM.
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Old 12-29-2013, 02:26 PM   #11
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What type of roof do I have?


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One side looks like APP that is alligatoring. That's the one with the cement. Fibered coating is what it needs. The roof cement could eat it all away along that break though.
The other looks like EPDM.
We just moved in this house this year. I have no idea why repairs were done this way. I don't know where the leak is on the roof but water is dripping from the ceiling directly beneath the 'alligatoring'. Any suggestions what material to use and how to go about laying it down? Does the old cement patch work need to be removed 1st?
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Old 12-29-2013, 02:50 PM   #12
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What type of roof do I have?


If that's APP, it needs to be coated with fibered aluminum coating. It's supposed to be coated every 3-5 years. It maybe too far gone to do more than get another year out of it. THe material is rated for 10 years
Is it about 5/16" thick, by 3' wide sheets?
As for the leak, did you look closely at the metal joints?
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Old 12-29-2013, 03:25 PM   #13
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What type of roof do I have?


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If that's APP, it needs to be coated with fibered aluminum coating. It's supposed to be coated every 3-5 years. It maybe too far gone to do more than get another year out of it. THe material is rated for 10 years
Is it about 5/16" thick, by 3' wide sheets?
As for the leak, did you look closely at the metal joints?
I can verify 3' sheets. I can't tell you the thickness.
The roof looks to be in real good shape to this beginner's eyes. It's starting to crack right where someone did some patch work and I think that's where the water is getting in or the metal joint like you suggested.

I originally posted that I did some small patch work about 4 months ago. The repair didn't last long and I'm wondering if I used the wrong stuff to patch with.
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Old 12-29-2013, 03:52 PM   #14
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What type of roof do I have?


"The repair didn't last long and I'm wondering if I used the wrong stuff to patch with."
The correct cement is Karnak 19Ultra. You need to also buy 'asphalt impregnated cotton' fabric or some other mesh where you make a repair. It has to be used sparingly.
Thin layer of cement, mesh pressed into it, then coated with a thin layer of cement. That could last for awhile, or not, depending on the roof material itself.
That said, the correct repair would be to take a torch and burn a patch onto the existing. DO NOT TRY THAT! Even skilled, trained roofers burn houses and businesses down doing it.

Let's see a closeup of about a 2' x 2' section of roof, including a seam or two.
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Old 12-30-2013, 01:27 PM   #15
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What type of roof do I have?


Is this a town house? If it is, it's possible that the false wall (where the metal is) is letting water migrate from your neighbors roof. Hardly anyone ever really terminates these connections.

If it's not a town house, and both sides of that roof are yours, the same thing could be happening. Plus if one side was replaced with EPDM it's likely the Mod bit side is on it's way out the door.

Try and located where it's coming in from the roof in relation to the area it's coming in from the house. If it's a ply wood deck water generally doesn't travel far. I say generally because we all know water does what it wants when it wants, more so when there is more then one roof layer involved.

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