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Re: Metal roofs
[Re: just_an_illusion]
#3888631
04/01/23 03:52 PM
04/01/23 03:52 PM
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Joined: Jan 2015
Posts: 2,076
Alabama
canvasback
OP
8 point
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OP
8 point
Joined: Jan 2015
Posts: 2,076
Alabama
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DO NOT lay metal directly over the top of a shingle roof if you are replacing an existing roof. Pull the shingles and tar paper, lay new synthetic moisture barrier and 1x4 fir strips, then metal. Laying metal over the top of shingles and/or screwing it to OSB is a problem waiting to happen. What problems can potentially happen? The roofer has told us he would do what you are recommending NOT to do if we went with metal.
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Re: Metal roofs
[Re: just_an_illusion]
#3888636
04/01/23 04:01 PM
04/01/23 04:01 PM
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Joined: Dec 2000
Posts: 1,417
Cullman,Al.
fingers
8 point
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8 point
Joined: Dec 2000
Posts: 1,417
Cullman,Al.
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DO NOT lay metal directly over the top of a shingle roof if you are replacing an existing roof. Pull the shingles and tar paper, lay new synthetic moisture barrier and 1x4 fir strips, then metal. Laying metal over the top of shingles and/or screwing it to OSB is a problem waiting to happen. Me and buddy have been installing metal roofs for about 20 yrs. ( him longer). We have put many, many, many metal roofs right on top of shingles. No issues no call backs. I did it on my personal house at least 10 yrs. ago, no problems.
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Re: Metal roofs
[Re: canvasback]
#3888640
04/01/23 04:09 PM
04/01/23 04:09 PM
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Joined: Aug 2001
Posts: 72,626
Luverne, AL
Skinny
GUVNER
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GUVNER
Joined: Aug 2001
Posts: 72,626
Luverne, AL
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Just go on and get the metal. It will outlive you.
"Never Trust Government" -- Smart people.
"The Great thing we should Fear and the Weird Thing we Trust is Elon Musk" -- Me
"You can be broke but you cant be poor." -- Ruthie-May Webster
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Re: Metal roofs
[Re: fingers]
#3888668
04/01/23 05:15 PM
04/01/23 05:15 PM
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Joined: Dec 2015
Posts: 25,231
blount county alabama
jwalker77
Pumpkin - The Thermal Expert
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Pumpkin - The Thermal Expert
Joined: Dec 2015
Posts: 25,231
blount county alabama
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DO NOT lay metal directly over the top of a shingle roof if you are replacing an existing roof. Pull the shingles and tar paper, lay new synthetic moisture barrier and 1x4 fir strips, then metal. Laying metal over the top of shingles and/or screwing it to OSB is a problem waiting to happen. Me and buddy have been installing metal roofs for about 20 yrs. ( him longer). We have put many, many, many metal roofs right on top of shingles. No issues no call backs. I did it on my personal house at least 10 yrs. ago, no problems. I have a friend who does metal roofing. He generally lays it directly over shingles. He has a really good reputation for doing good work. He laid mine last summer. I had him put laths under it just for a little insulation factor because we have a vaulted ceiling in the living room that gets hot for some reason. It lowered the temp a good bit and my power bill went down $30/month after we got the new roof. I would recommend getting all the trim and all around the edges. It costs a little more but it makes it look alot better. I suppose its possible screwing it straight to the shingle roof could cause some sort of moisture problem some how but ive never heard of it happening.
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Re: Metal roofs
[Re: just_an_illusion]
#3888669
04/01/23 05:16 PM
04/01/23 05:16 PM
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Joined: Apr 2022
Posts: 2,153
Chambers Cnty./Ft. Morgan Ala.
Buckwheat
8 point
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8 point
Joined: Apr 2022
Posts: 2,153
Chambers Cnty./Ft. Morgan Ala.
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DO NOT lay metal directly over the top of a shingle roof if you are replacing an existing roof. Pull the shingles and tar paper, lay new synthetic moisture barrier and 1x4 fir strips, then metal. Laying metal over the top of shingles and/or screwing it to OSB is a problem waiting to happen. First off.....metal "Sweats" and not allowed to Breathe will rust much quicker. Second.....You need something other than OSB or 1/2" plywood to anchor the screws into in order for them to not loosen with building movement. Furring should be PINE.....not Lodgepole. Lodgepole is too soft...
Last edited by Buckwheat; 04/01/23 05:17 PM.
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Re: Metal roofs
[Re: canvasback]
#3888742
04/01/23 07:17 PM
04/01/23 07:17 PM
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Joined: Jan 2014
Posts: 4,482
North AL
just_an_illusion
10 point
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10 point
Joined: Jan 2014
Posts: 4,482
North AL
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DO NOT lay metal directly over the top of a shingle roof if you are replacing an existing roof. Pull the shingles and tar paper, lay new synthetic moisture barrier and 1x4 fir strips, then metal. Laying metal over the top of shingles and/or screwing it to OSB is a problem waiting to happen. What problems can potentially happen? The roofer has told us he would do what you are recommending NOT to do if we went with metal. First, Shingles and metal expand at different rates thus causing the shingles to wear the paint off the underside of the metal and causing it to rust and the warranty null and void. Second, the screws will back out or pull out of the 7/16 osb. Usually the screws strip the osb when installed and do not have any real bite. Third, as buckwheat stated it'll sweat, the 1x4 PINE furring will provide an air gap to help with drying and as JWalker said it'll provide a dead air insulation zone. There are 6 houses on this dead end road that are my wife's family and all had metal installed over shingles and everyone of them has had the problems I just mentioned. My mother in laws roof has had the screws replaced/retightened 4 times in the 15 or so years it's been on there and it still leaks. Metal is the way to go, when installed correctly. The house we plan to build this year will have metal. I hate shingles, I just came off the roof from replacing shingles again for the second weekend in a row due to high winds. Others milage may vary, but that's my experience and I know of several others with the same issues.
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Re: Metal roofs
[Re: just_an_illusion]
#3888785
04/01/23 08:30 PM
04/01/23 08:30 PM
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Joined: Jun 2016
Posts: 1,909
lauderdale co
brushwhacker
8 point
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8 point
Joined: Jun 2016
Posts: 1,909
lauderdale co
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DO NOT lay metal directly over the top of a shingle roof if you are replacing an existing roof. Pull the shingles and tar paper, lay new synthetic moisture barrier and 1x4 fir strips, then metal. Laying metal over the top of shingles and/or screwing it to OSB is a problem waiting to happen. What problems can potentially happen? The roofer has told us he would do what you are recommending NOT to do if we went with metal. First, Shingles and metal expand at different rates thus causing the shingles to wear the paint off the underside of the metal and causing it to rust and the warranty null and void. Second, the screws will back out or pull out of the 7/16 osb. Usually the screws strip the osb when installed and do not have any real bite. Third, as buckwheat stated it'll sweat, the 1x4 PINE furring will provide an air gap to help with drying and as JWalker said it'll provide a dead air insulation zone. There are 6 houses on this dead end road that are my wife's family and all had metal installed over shingles and everyone of them has had the problems I just mentioned. My mother in laws roof has had the screws replaced/retightened 4 times in the 15 or so years it's been on there and it still leaks. Metal is the way to go, when installed correctly. The house we plan to build this year will have metal. I hate shingles, I just came off the roof from replacing shingles again for the second weekend in a row due to high winds. Others milage may vary, but that's my experience and I know of several others with the same issues. I had standing seam metal put over my shingles .put down 1x4 lathe first then 1/2 “ insulation sheets between . The cost for shingles was gonna be $8300 the standing seam was $12,000. The galvalume would be cheaper but I was not interested in that . Mine has no screws showing so no leaks . This way everyone in my area does it . No none tears off shingles to put metal on unless the roof was leaking an underpayment rotted. Many colors to choose from an a 40 year warranty on paint .
Brushwacker
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Re: Metal roofs
[Re: brushwhacker]
#3888789
04/01/23 08:36 PM
04/01/23 08:36 PM
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Joined: Jan 2014
Posts: 4,482
North AL
just_an_illusion
10 point
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10 point
Joined: Jan 2014
Posts: 4,482
North AL
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DO NOT lay metal directly over the top of a shingle roof if you are replacing an existing roof. Pull the shingles and tar paper, lay new synthetic moisture barrier and 1x4 fir strips, then metal. Laying metal over the top of shingles and/or screwing it to OSB is a problem waiting to happen. What problems can potentially happen? The roofer has told us he would do what you are recommending NOT to do if we went with metal. First, Shingles and metal expand at different rates thus causing the shingles to wear the paint off the underside of the metal and causing it to rust and the warranty null and void. Second, the screws will back out or pull out of the 7/16 osb. Usually the screws strip the osb when installed and do not have any real bite. Third, as buckwheat stated it'll sweat, the 1x4 PINE furring will provide an air gap to help with drying and as JWalker said it'll provide a dead air insulation zone. There are 6 houses on this dead end road that are my wife's family and all had metal installed over shingles and everyone of them has had the problems I just mentioned. My mother in laws roof has had the screws replaced/retightened 4 times in the 15 or so years it's been on there and it still leaks. Metal is the way to go, when installed correctly. The house we plan to build this year will have metal. I hate shingles, I just came off the roof from replacing shingles again for the second weekend in a row due to high winds. Others milage may vary, but that's my experience and I know of several others with the same issues. I had standing seam metal put over my shingles .put down 1x4 lathe first then 1/2 “ insulation sheets between . The cost for shingles was gonna be $8300 the standing seam was $12,000. The galvalume would be cheaper but I was not interested in that . Mine has no screws showing so no leaks . This way everyone in my area does it . No none tears off shingles to put metal on unless the roof was leaking an underpayment rotted. Many colors to choose from an a 40 year warranty on paint . Standing seam is nice for sure, but usually a good bit more expensive. The 1x4 lathe and the foam insulation sheet or double bubble insulation is the way to go if installing over shingles.
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Re: Metal roofs
[Re: Wadenthebushes]
#3888792
04/01/23 08:40 PM
04/01/23 08:40 PM
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Joined: Dec 2015
Posts: 25,231
blount county alabama
jwalker77
Pumpkin - The Thermal Expert
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Pumpkin - The Thermal Expert
Joined: Dec 2015
Posts: 25,231
blount county alabama
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CON--- out in the country your internet or cell phone reception may be reduced. Mine was. I guess i miss 1/2 or more of the calls i get when im at home, which isnt a terrible thing. Texts generally come through as normal though.
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