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Old 09-15-2008, 09:28 PM   #1
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PVC Membrane question


Hi all.

I have a quick question about a roof we had installed over the weekend. We have a 10x15 flat roof on part of our house replaced. They did a tear off of the old torchdown and replaced it with a new PVC Membrane roof and also installed a skylight. Everything looks good, except there are a number of bubbles under the roofing membrane. They're mostly near the edged, and not too big.

Does anyone think those bubbles are a problem or I should be concerned about them?

I'm assuming that this kind of roof is not supposed to be glued down or somehow otherwise attached to the plywood underneath. Is that correct?

Also, we live in Portland, OR. So we get a lot of rain. Thought I don't think that matters, I figured I would mention it in case it did.

Thanks in Advance!

Frank

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Old 09-15-2008, 09:33 PM   #2
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PVC Membrane question


Got any pics?

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Old 09-15-2008, 10:21 PM   #3
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PVC Membrane question


What brand of material was used?

Was it supposed to be fully adhered, mechanically fastened, or ballasted? I am presuming fully adhered.

Post some photos please.

Ed
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Old 09-15-2008, 10:55 PM   #4
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PVC Membrane question


wow, quick replies.

Quote:
Was it supposed to be fully adhered, mechanically fastened, or ballasted?
The quote doesn't say which it would be. Though from what I can see on the roof it's not mechanically fastened or ballasted.

It has a "PVC drip edge" install. The roofing seams to be sealed near the edge. The bubbles are not very high, about 1/2" maybe up to 1". It just seemed the whole PVC roof material was not attached, except at the edges and where the skylight is. I don't know if that is a problem or not.

I'll get some pictures tomorrow. I don't think you'll be able to see much from the photos. The roof is all white and the bubbles are small enough that the height difference probably will not show in the photo.

Thanks!

Frank
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Old 09-15-2008, 11:15 PM   #5
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PVC Membrane question


hmm, they may have pulled a fast one on you and just put down a blanket and pinned it around the perimeter. A deck like that should have been fully adhered. Like they said, pictures would get you more than guesses from us.
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Old 09-16-2008, 07:13 PM   #6
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PVC Membrane question


Are the bubbles just in the seam?

That could have been moisture in a hot air welded material, and if it has a PVC drip edge, it sounds like a Duro-Last membrane roof.

Ed
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Old 09-16-2008, 07:37 PM   #7
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PVC Membrane question


The bubbles are not in the seems, just in the areas between them.

I have included some pictures. I tried to make them as good as I could. I put a dime in a few for perspective.

It looks good to me (but I don't know much about roofs). I just wasn't expecting bubbles in there we it was finished. I figured it would be glued or something.

Thanks!
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Old 09-16-2008, 10:51 PM   #8
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PVC Membrane question


looks like someone was getting some practice in on your roof. Was this a licensed contractor or the cheapest tailgater you found?
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Old 09-17-2008, 12:14 AM   #9
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PVC Membrane question


It looks to be mechanically fastened, which just means that the seam that gets covered up with the next sheet is the one that is screwed down with screws and plates.

It is not ideally tight enough, but I need a full picture view to see how truly bad the wrinkles, not bubbles, actually are.

Ed
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Old 09-17-2008, 01:24 AM   #10
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PVC Membrane question


I agree its not that pretty but I've seen alot worse and should not effect the system at all,except for holding a bit of water here and there.
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Old 09-17-2008, 01:26 AM   #11
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I was looking more at the welds and the pinch points in the seams and corner welds. Some areas look like less than an inch of weld on them. As far as the wrinkles go, that won't affect the integrity of the membrane, just sloppy work, especially on a flat, square deck.
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Old 09-17-2008, 09:31 PM   #12
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I just got home from work and realized that I didnt click submit on the below post I made (or rather intended to make) last night. Oops!

**********

Uggg...

It was a licensed contractor.

So that kind of roof should be flat and smooth, and adhered to plywood underneath it?

Is this something I should get them to fix. I have brought this up a few times, because I was expecting it to be flat and I've never seen a roof like that. The contractor kept saying that it was normal and it was supposed to "float" like that.

<sigh> I was afraid of this. I haven't paid the last portion yet. Should I request it be fixed? Crap, don't even think this can be fixed. Not sure what to do at this point. Maybe get another roofer to look at it? Ugg...

We even checked references. Though I am not sure people would know if there was a problem. My wife wouldn't know the difference and I don't know myself. Though I like to do stuff on the house (replace windows, build a deck and a shed), but I wasn't going to mess with a roof and wanted to leave that to the pro's.

I appreciate y'alls help.
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Old 09-17-2008, 09:36 PM   #13
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OK. I feel a little better after the last 3 posts. I had originally wrote that reply after OldNBroken's reply "looks like someone was getting some practice in on your roof. Was this a licensed contractor or the cheapest tailgater you found?", which really scared me.

So it's not a good job, but the roof should be OK and keep me from having pots and pans around the den. Right? Well, at least lie to me because I am not sure I can do much about it at this point. LOL

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Old 09-17-2008, 10:15 PM   #14
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Shouldn't take long to see if it's going to leak or not seeing's how you live on the rusty side of our neck of the woods. Some of us are just a little more meticulous in our work than others. Based on your pictures it just looks like they don't take much pride in their installations. Doesn't necessarily mean it's a bad install, I would never accept work like that from any of my guys is all.
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Old 09-17-2008, 10:58 PM   #15
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Quote:
Originally Posted by OldNBroken View Post
Shouldn't take long to see if it's going to leak or not seeing's how you live on the rusty side of our neck of the woods. Some of us are just a little more meticulous in our work than others. Based on your pictures it just looks like they don't take much pride in their installations. Doesn't necessarily mean it's a bad install, I would never accept work like that from any of my guys is all.
Pretty much the same here.

I am nit-picky, and strive for a better aesthetic quality right after the functional quality standards have been met.

Ed

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