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Metal Roof Repairs

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TwinCreek

04-21-2002 17:51:14




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I have a metal roof on a section of my barn that I can't seem to get the leaks stopped. It seems to leak at the seams. I've patched every seam and nail hole and it still leaks. It is the kind of metal roof with the small corrugations - 3/4" or so and it has a fairly steep pitch. My question is does anyone know if it is possible to bond roll type roofing over top the metal roof? How would you do it? Thanks for your help.

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BillW

04-29-2002 09:05:17




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 Re: Metal Roof Repairs in reply to TwinCreek, 04-21-2002 17:51:14  
Have a 25 yr old metal building built with a combination of wood & metal supports on concrete. The metal was nailed onto wood stringers(?). Began getting leaks. Tried replacing loosened roof nails with pole barn screws and it helped for a few years.
Looked into & got quotes on Rubber reroofing, asphalt shingles, etc. A contractor I knew from another state suggested a new metal roof over the old with treated 2x4 and 1 1/2" foam insulation.
There was already compressed &/or sagging fiberglass with single plastic side under the old tin. With the new roof utility bills have been cut by at least a third and the $ difference saved over the rubber roof saved us a lot.

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Bus Driver

04-22-2002 17:27:21




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 Re: Metal Roof Repairs in reply to TwinCreek, 04-21-2002 17:51:14  
If not much air movement under the roofing, condensation is a real possibility. If air moves freely under it, condensation is less likely-especially when the temperatures stay above freezing. You say you patched the seams. The patching will crack, admitting some water. If the seam has an area below with no crack, the water cannot escape on the patched side and runs inside over the shallow corrugation. One solution is to use the 6" wide fiberglass mesh and use asphalt base aluminum coating. If the metal has no rust, acrylic coating can be used. Cover the seam with the coating, bed the mesh into the wet coating and then coat over that. Lots of labor involved. For screw or nail heads, use urethane compound such as NP-1. Comes in caulking tube. I repaired 40 year old roof with deteriorated neoprene washers on the nails with the NP-1. Perfect results. Try to use all the tube the same day it is opened. Don't use putty knife, just gun the NP-1 on neatly and leave it be. Check industrial roofing/waterproofing suppliers for the NP-1.

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Doug

04-22-2002 09:33:12




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 Re: Metal Roof Repairs in reply to TwinCreek, 04-21-2002 17:51:14  
A few years back I bought a house with a barn and a leaky metal roof. Mine was leaking at the screws that hold the roof sheets on. I used clear silocone and covered each and every screw completely. This stopped my roof from leaking. One word of caution, the silocone must have gotten under my skin through my pours and my fingers looked like they had large blisters. The silocone worked its way out eventually but wear some disposable gloves. May have already tried this but it worked for me.

Thanks,
Doug

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ernied

04-23-2002 18:55:02




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 Re: Re: Metal Roof Repairs in reply to Doug, 04-22-2002 09:33:12  
Silicone has acetic acid in it. You had acid burns.



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Tyler(WA)

04-22-2002 09:06:30




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 Re: Metal Roof Repairs in reply to TwinCreek, 04-21-2002 17:51:14  
If it's not insulated, you wouldn't know a leak from condensation, as the others have noted.

If it turned out that you did have a leak, you would want to seal it with something like RV or Mobile home roof coating. Roll roofing won't bond to metal but the modern roof coatings will.



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F14...Silly Question

04-22-2002 05:18:19




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 Re: Metal Roof Repairs in reply to TwinCreek, 04-21-2002 17:51:14  
Are you SURE it's leaking? Any chance it's condensation? I was warned about that problem when I put metal roofing on my barn. Haven't seen it yet, just throwing out the possibility.



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Red Dave - Yep!

04-22-2002 06:01:14




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 Re: Re: Metal Roof Repairs in reply to F14...Silly Question, 04-22-2002 05:18:19  
I had that experience. Right after I built my pole barn. Thought my brand new barn had holes in the roof. Haven't had the problem since I insulated it.



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JoeK

04-21-2002 20:00:20




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 Re: Metal Roof Repairs in reply to TwinCreek, 04-21-2002 17:51:14  
I know of no way to bond rolled roofing over corrugated steel,but in the past few years there have been some real improvements in brush on/roll on type repair coatings.Where they used to be a temporary fix,many of the new compounds are made for long term repairs.I know Gemplers.com offers them and I imagine there are prolly yellow pages listings for this type of service.



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