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jtrom 10-15-2012 01:20 PM

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??

joecaption 10-15-2012 01:24 PM

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?

jtrom 10-15-2012 02:53 PM

5 Attachment(s)
Here are the pics. The roof is fastened with exterior screws with a rubber gasket.

joecaption 10-15-2012 03:31 PM

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.

jtrom 10-15-2012 03:50 PM

I it hopeless?

kwikfishron 10-15-2012 04:09 PM

Replacing the screws with new and use butyl tape between the laps is what I’d do short of replacing the roof

redman88 10-15-2012 04:24 PM

Where the two roofs meet is your problem

jtrom 10-15-2012 05:56 PM


Originally Posted by redman88 (Post 1031450)
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?

redman88 10-15-2012 07:35 PM

I guess proper flashing over the metal and at least one row of the shingles

JWilliams850 10-16-2012 12:31 AM

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

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