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Old 10-15-2012, 01:20 PM   #1
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How to seal metal roof seams from outside


I have a 20' X 40' "lean to" cement block workshop attached to my barn. I say "lean to" but the slope is almost nil. (there is SOME slope, but not much). It is leaking like crazy. It had a metal roof installed on top of the old shingle roof probably 10 years ago or so. (also a layer of pink foam board between the old shingle and metal roof). All the stepped lap seams were never sealed with sealant tape. Should I seal all the lap and seams with a sealant??...I found a product online called Henry 295 Metal Roof Seam Sealer but can't find it anywhere...any advice out there??

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Old 10-15-2012, 01:24 PM   #2
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How to seal metal roof seams from outside


Do all the sealing you want but it's still going to leak.
A metal roof like that needed a min. of a 12-2 pitch if not it's going to leak.
If just nails were used and not the metal roof screws with washers that were not over torqed breaking the washer it's going to leak.
Got a picture?

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Old 10-15-2012, 02:53 PM   #3
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How to seal metal roof seams from outside


Here are the pics. The roof is fastened with exterior screws with a rubber gasket.
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Old 10-15-2012, 03:31 PM   #4
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How to seal metal roof seams from outside


I'm not seeing how a roof built like that is not going to leak.
It should have been built so the rafters were sitting up on the old garage roof to give is some slope.
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Old 10-15-2012, 03:50 PM   #5
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How to seal metal roof seams from outside


I know....is it hopeless?
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Old 10-15-2012, 04:09 PM   #6
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How to seal metal roof seams from outside


Replacing the screws with new and use butyl tape between the laps is what I’d do short of replacing the roof
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Old 10-15-2012, 04:24 PM   #7
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How to seal metal roof seams from outside


Where the two roofs meet is your problem
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Old 10-15-2012, 05:56 PM   #8
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How to seal metal roof seams from outside


Quote:
Originally Posted by redman88 View Post
Where the two roofs meet is your problem
What can I do?...Tar it where the metal meets the shingles? (go all the way up 3 shingles high):....or put in a wider flashing there?
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Old 10-15-2012, 07:35 PM   #9
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How to seal metal roof seams from outside


I guess proper flashing over the metal and at least one row of the shingles
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Old 10-16-2012, 12:31 AM   #10
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How to seal metal roof seams from outside


just from looking at the pictures the transition flashing doesnt look like it runs up the shingle roof far enough.

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