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OT- need metal roofing expert opinion

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diggerdave

01-31-2005 06:12:18




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HI All looking for possible solutions or options here... Had a metal roof installed a bit ago. Its the kind with large maybe 2 ft wide panels with ridges, panels are screwed down, next panel covers that and so on. Problem is the space between the panels and the ridge vent.There is plenty of overlap so water does not get in. What does get in is snow when the winds whip as they do in VT a lot. There are these foam inserts (w adhesive on the top and bottom) that are squezzed in between the roof panel and the ridge vent. Ive been up on the roof and they dont seem to sit too tight thus allowing wind driven snow into the attic etc. ( the amount of snow can add up to a nice little pile so im not talking a trace amount.. thats why im worried) What can I do to allow the exchange of air but seal it up? Another thing is only one peak is accessible from the inside. The others, for arguements sake are inaccessible, so id like to look at fixes from the outside. Appreciate your advise b4 i go back to the contractor. diggerdave

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jdemaris

02-01-2005 19:35:32




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 Re: Try rolled mesh instead in reply to diggerdave, 01-31-2005 06:12:18  
I haven't used the foam-fillers that you have, for venting the ridge-cap. I opted for
ridge-vent mesh - comes in 20' rolls and is about the same width as standard steel ridge
cap. You pull your cap off, roll in on, put the ridge cap back on and screw it snug. The
mesh collapses a bit and conforms to the irregularities of the steel roofing. I've got a 5/12
pitch roof and one side directly faces the prevailing wind. And we get a lot of wind and
snow - just as much as anywhere in Vermont (I used to live in the Northeast Kingdom in
Northern Vermont). I've had no problems with snow intrusion - I get a little powder, but
that's it. If my ridge wasn't vented, the roof would rot out - even with gable vents and
soffit vents - regardless of what code dictates. Often code is the bare minimum required
and is not adequate for all situations. There is no attic or dead air space in the building
I'm talking about, just a cathedral ceiling with 10" rafters and 7" of insulation. If I had an
unheated attic, I could get away with not having the vented ridge. I don't know what your
building has, but Cathedral ceilings can be a problem - and many experts and engineers
still disagree on the venting issue and what approach works best. One school of thought
is proper venting, i.e. air exchange. But, experts now also believe the answer is to have
NO air movement by not having any air spaces for moisture to get in to - and NO vents
and all cavities filled. From what I've seen, this latter approach works with cavities that
are completely filled with foam. In regard to some of the other responses about seams never leaking - I'm not sure they
understand what your problem actually is. A standard steel ridge cap on a steel roof
(ribbed - approx. 36" wide) will allow snow intrusion regardless of what the pitch is - all
it takes is wind and snow. The lap coverage is irrelevant, the issue is a flat ridge cap
against a ribbed roof panel - it leaves gaps. Claiming that a roof panel lapped over
another roof panel does not leak - has nothing to do with the issue at hand (if I'm reading
your post correctly).

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raytasch

01-31-2005 16:48:51




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 Re: OT- need metal roofing expert opinion in reply to diggerdave, 01-31-2005 06:12:18  
All my buildings are steel roof with 3/4" ribs. All my roofs have 3.5--12 pitch. I have no leakage between vertical sheets. I had no water intrusion during the hurricanes this year or any other time. I sealed between the vertical sheeting and the ridge cap with spray foam sealer that you get in any building supply store. I vent my house roof with gable end louvered vents and that meet local building codes. ray, in FL

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Bus Driver

01-31-2005 10:03:24




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 Re: OT- need metal roofing expert opinion in reply to diggerdave, 01-31-2005 06:12:18  
The end overlap between sheets should be at least 6". I have never seen snow blow through such an overlap. Sounds like the contractor used less end overlap. One fix would be to remove the fasteners in that area, insert a 12" long piece so that 6" is hidden below the sheet above and refasten. Tell the contractor about the problem first and see how he reacts.



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john in la

01-31-2005 08:26:06




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 Re: OT- need metal roofing expert opinion in reply to diggerdave, 01-31-2005 06:12:18  
They make differant size/types of ridge cap BUT...

I would first want to know how long is "A BIT AGO"??
While you may get some very good advise here I would not touch it till I talked to the contractor. Any thing you do to it will void any chance of the contractor fixing it for you if your solution does not work. Besides you all ready paid for the job might as well get a quality job.
If the contractor does the job it would not matter if the fix is from the out side or inside that is his problem of getting to it.

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Joel Harman

01-31-2005 07:05:23




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 Re: OT- need metal roofing expert opinion in reply to diggerdave, 01-31-2005 06:12:18  
maybe there is a wider ridge cap available. What is pitch of roof?



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