Roof Help??? - The HuntingPA.com Outdoor Community
 
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post #1 of 10 (permalink) Old 07-31-2012, 10:57 PM Thread Starter
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Roof Help???

I'm hoping to get some advise from you folks. Dad called me this eve and he has two quotes for our detached garage roof at camp.

The quotes are to install a metal roof but here's the question??? One guy wants to remove the very old curled up moss covered shingles and the other guys wants to install the roof over top of the mossy shingles.

I do know that some of the roof plywood does get wet under the shingles cuz I can see the water stains on the exposed roof in the garage.

The difference between removing old shingles and letting shingles on is $800. Is it neccessary to remove the old shingles???

One quote stated.... to install a metal roof with (treated perlins on 24" of center) whatever that means. I guess that the wooden laths that the roof attaches to...

Thank you in advance for your responses!!

bootmud
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post #2 of 10 (permalink) Old 07-31-2012, 11:02 PM Thread Starter
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Re: Roof Help???

$2800
vs
$2000
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post #3 of 10 (permalink) Old 07-31-2012, 11:13 PM
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Re: Roof Help???

Get rid of the old shingles if you can afford it! Also, treated lumber should not make contact with the metal. The chemicals in the treated will corrode the metal and it will rust from under the panel. If treated is used, felt paper should be placed between the metal and the lumber! In my opinion, regular lumber is fine for the purlins. How big is roof and where are you?
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post #4 of 10 (permalink) Old 07-31-2012, 11:16 PM
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Re: Roof Help???

You cannot put the metal DIRECTLY on top of the shingles, the old shingles will wear holes in the new metal. You can, however, strip the old roof with 1 X 4 or 6 hemlock boards, then install the new metal over that. I have done that many, many times with no issues ever. The metal will outlast you, and saving $800 is a good thing. Just make sure your guy is stripping out the old roof with new slats and you will be fine.

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post #5 of 10 (permalink) Old 07-31-2012, 11:39 PM
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Re: Roof Help???

I just installed another metal roof this past weekend. By all means, strip the old shingles off. You want to get rid of any trapped moister and rot that is in there. Treated lumber won't be necessary for the purlins; standard fir will work fine. However, I would cut strips of the old sheeting back at the bottom and at the top so air can circulate between the sheeting and the metal roof. ROOFS NEED CIRCUALTION!! You should never have a problem with it.

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post #6 of 10 (permalink) Old 07-31-2012, 11:47 PM
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Re: Roof Help???

Quote:
Originally Posted by nozzlehead
I just installed another metal roof this past weekend. By all means, strip the old shingles off. You want to get rid of any trapped moister and rot that is in there. Treated lumber won't be necessary for the purlins; standard fir will work fine. However, I would cut strips of the old sheeting back at the bottom and at the top so air can circulate between the sheeting and the metal roof. ROOFS NEED CIRCULATION!! You should never have a problem with it.
+1 on Nozzlehead's advice.

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post #7 of 10 (permalink) Old 08-01-2012, 12:02 AM
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Re: Roof Help???

yep Boot I use to buy and sell roofing for a lumber company. If the roof didn't have moss and the shingles were laying flat it would not be a problem putting it on top of shingles. If you read the manufactures installation they will say they require you to lath it out and the lath MUST be screwed into the rafters but the only reason for the lath is to make sure the metal roofing is secured to the "bones" of the structure. I see no reason to lath over flat laying shingles if the plywood or 1x sub roofing layer is strong and in good shape provided the proper length screw is used. If you are going to lath it out and not make sure the lath is screwed into the rafters it is a waste of time and money. It's no different then just screwing the metal directly to subroof layer.

But what nozzle said is the best way to install a metal roof.

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post #8 of 10 (permalink) Old 08-01-2012, 12:16 AM
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Re: Roof Help???

I'm another for removing all the old singles. You be happy you did in the long run. Not to mention they can and will hold moisture. Do you know the condition of the sheeting on the roof? You may need to replace this. IMO if only the first layer of the plywood is bad than you can get away with it, but more than that you really should replace it.

Do you have a ridge vent?

Do you have a gable vent?

Any valleys?

Happen to know the pitch of your roof?

Do you want to put anything for sound dampening?
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post #9 of 10 (permalink) Old 08-01-2012, 11:43 AM Thread Starter
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Re: Roof Help???

Gentlemen,

Thank you for your responses, they are all very helpful. I conveyed this info to my father who is retired and he is taking over from here since his is not moving a warp speed like myself most of the time...
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post #10 of 10 (permalink) Old 08-01-2012, 05:50 PM
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Re: Roof Help???

if nothing else get rid of the moss

if you bought it, a trucker brought it
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