Metal over Shingled Roof?


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Old 08-31-08, 07:20 PM
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Metal over Shingled Roof?

I have an old block garage in which the roof has what looks to be about 3 layers of shingles on. It doesn't have osb or plywood sheething. It is just boards as they did back then I guess. It does have some sags in it. I was thinking about just going over the roof with metal roofing. How would I go about this if it would be alright? Attach furring strips to the roof then lay the metal? Any idea on how much this would cost? Roughly 30x60 and I believe it is steeper than 4/12. Thx guys.
 
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Old 08-31-08, 07:30 PM
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if it has 3 layers of shingles you would need to strip the old shingles off, then fresh tar paper and lay the roof assuming you are using standing seam steel. if you are using corrugated steel you will need to support them with the furring strips that are made for them. hopefully some of the roofing pros will chime in and give you better/more appropriate info.

Murphy was an optimist
 
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Old 08-31-08, 08:15 PM
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Thank you sir. One of the main things I am concerned about is some of the sagging areas of the roof. I guess that would be caused by some of the boards being in bad shape or bowed and such. Thx for any info.
 
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Old 08-31-08, 08:26 PM
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Most standing seam roofs need to be installed on a smooth deck, and are too thin to be installed over perlins. But if you're using a heavy gauge metal roof (corregated panels or 36" wide barn panels), perlins can be used. In order to take the sag out of the roof (provided you can't correct the framing from inside the garage) you could shim the perlins straight, then have a better surface for your metal roof.
 
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Old 08-31-08, 09:11 PM
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Thanks. Yes it would be corrugated metal as used for barns and such. Everyone uses it around here for pole buildings and have seen quite a few homes getting roofed with metal nowadays. I really appreciate your info. What about cost? I am pretty handy and figure I could do it with a helper? I know metal is sky high right now also.
 
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Old 09-01-08, 12:01 AM
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Hi,

Metal roofing is the best way to make the leaking roof stronger and long lasting at lowest price possible with best service ever.
 
 

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