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Who is the metal roof guru on here? #3232521
10/01/20 04:02 PM
10/01/20 04:02 PM
Joined: Mar 2018
Posts: 657
South Baldwin
J
JayHook2 Offline OP
4 point
JayHook2  Offline OP
4 point
J
Joined: Mar 2018
Posts: 657
South Baldwin
Going back with metal roof after our hurricane damage. What's the best method? Remove the shingles? Over top of shingles? Strip with 1x4 or 2x4?
I know somebody on here does roofing just can't remember who....

Re: Who is the metal roof guru on here? [Re: JayHook2] #3232524
10/01/20 04:06 PM
10/01/20 04:06 PM
Joined: Dec 2009
Posts: 9,515
Trussville
T
toothdoc Offline
14 point
toothdoc  Offline
14 point
T
Joined: Dec 2009
Posts: 9,515
Trussville
Is Trox still on here?

Re: Who is the metal roof guru on here? [Re: JayHook2] #3232532
10/01/20 04:19 PM
10/01/20 04:19 PM
Joined: Dec 2009
Posts: 8,979
USA
M
marshmud991 Offline
14 point
marshmud991  Offline
14 point
M
Joined: Dec 2009
Posts: 8,979
USA
Not a guru here but I can tell you that every metal roof that was put right on top of shingles here are about a mile to the north and west of the house it was on. The ones that were stripped with 2x4s and good long screws into the rafters are only 1/8 of a mile away with the rafters still entacted. Just kidding. These roofs were still on the houses. Some had minor damage and some were just fine. My old house was stripped with 2x4s and good screws and it survived Rita and I asked my Godfather( the person who bought it) and he said the roof survived Laura also. I hope this helps you.


It's hard to kiss the lips at night that chews your a$$ all day long.


Re: Who is the metal roof guru on here? [Re: JayHook2] #3232543
10/01/20 04:35 PM
10/01/20 04:35 PM
Joined: Oct 2012
Posts: 2,044
etowah co.
shootnmiss Offline
8 point
shootnmiss  Offline
8 point
Joined: Oct 2012
Posts: 2,044
etowah co.
I've put a bunch of metal down and never removed the shingles. When I did my roof, straight on top of the shingles. The way I always looked at it was if a big hail storm hit it couldn't beat the metal up as bad having something directly under it. Maybe I'm wrong in my thinking but seems logical.

Re: Who is the metal roof guru on here? [Re: JayHook2] #3232548
10/01/20 04:55 PM
10/01/20 04:55 PM
Joined: Jan 2011
Posts: 5,747
Hoover, AL
M48scout Offline
12 point
M48scout  Offline
12 point
Joined: Jan 2011
Posts: 5,747
Hoover, AL
Download some installation guides from various manufacturers. The ones I read all directly prohibited putting it down on shingles. The thermal expansion scratches the metal underneath causing corrosion. The guides I read seemed to prescribe exactly what marshmud described. That, and placing insulation board in between furring strips (2x4’s screwed to rafters) to displace volume of air that will contain water vapor and condense underneath. The guides also go to a great deal of detail on the screwing patterns around the perimeter (key to preventing uplift and peeling off from wind), and a great deal of detail on the various flashing and sealing. I think even if you are hiring it out it’s a good idea to locate and download 2 or 3 of those product brochures/installation manuals. After educating yourself you can better decide who is a quality installer.

EDIT: BTW depending on how your house is built, finding the rafter centerline at the ridge and eave as you progress across the roof length may not be trivial. The one roof I did was very time consuming because it was not laid out on 16” centers and varied from ridge to eave. I had to probe with screws to establish each rafter and snap a chalk line for each rafter. A professional no doubt knows more tricks than me, but I could see how someone competing on jobs would avoid doing that if possible and the customer didn’t make them.

Last edited by M48scout; 10/01/20 05:16 PM.
Re: Who is the metal roof guru on here? [Re: M48scout] #3232560
10/01/20 05:10 PM
10/01/20 05:10 PM
Joined: Sep 2012
Posts: 17,926
North AL
A
AU338MAG Online IMG_0051.GIF
Old Mossy Horns
AU338MAG  Online IMG_0051.GIF
Old Mossy Horns
A
Joined: Sep 2012
Posts: 17,926
North AL
Originally Posted by M48scout
Download some installation guides from various manufacturers. The ones I read all directly prohibited putting it down on shingles. The thermal expansion scratches the metal underneath causing corrosion. The guides I read seemed to prescribe exactly what marshmud described. That, and placing insulation board in between furring strips (2x4’s screwed to rafters) to displace volume of air that will contain water vapor and condense underneath. The guides also go to a great deal of detail on the screwing patterns around the perimeter (key to preventing uplift and peeling off from wind), and a great deal of detail on the various flashing and sealing. I think even if you are hiring it out it’s a good idea to locate and download 2 or 3 of those product brochures/installation manuals. After educating yourself you can better decide who is a quality installer.

Good advice. If you are in a coastal region different codes apply for roofing. IIRC, mobile and Baldwin counties started requiring an ice/water shield under all new roofs a few years ago. This is not just for new houses but replacement roof projects.

Tear the shingles off and Do it right and save some headaches in the future.


Dying ain't much of a living boy...Josey Wales

Molon Labe
Re: Who is the metal roof guru on here? [Re: JayHook2] #3232566
10/01/20 05:22 PM
10/01/20 05:22 PM
Joined: Jan 2015
Posts: 3,538
Spanish Fort
O
ozarktroutbum Offline
10 point
ozarktroutbum  Offline
10 point
O
Joined: Jan 2015
Posts: 3,538
Spanish Fort
We did a metal roof on our house about two years ago. 1x4’s over existing shingles. Just about everything else in the neighborhood blew down last week but the roof

Re: Who is the metal roof guru on here? [Re: JayHook2] #3232598
10/01/20 06:33 PM
10/01/20 06:33 PM
Joined: Jan 2011
Posts: 38,489
N. Bama
257wbymag Offline
Boo Boo Head
257wbymag  Offline
Boo Boo Head
Joined: Jan 2011
Posts: 38,489
N. Bama
Au7mm08


Quietly killing turkeys where youre not!!!
My tank full of give a fraks been runnin on empty
I'm the paterfamilias
Re: Who is the metal roof guru on here? [Re: 257wbymag] #3232616
10/01/20 07:01 PM
10/01/20 07:01 PM
Joined: Oct 2008
Posts: 30,910
Clanton, AL
Out back Offline
Grumpy Old Man
Out back  Offline
Grumpy Old Man
Joined: Oct 2008
Posts: 30,910
Clanton, AL
Originally Posted by 257wbymag
Au7mm08

Yeah buts he's an expert on everything. 😉


My opinions and comments are my own. They do not reflect the position or political opinions of Aldeer or any of the Aldeer administration.
Re: Who is the metal roof guru on here? [Re: M48scout] #3232642
10/01/20 07:45 PM
10/01/20 07:45 PM
Joined: Jun 2019
Posts: 3,377
Sylvania Alabama
Sandmtnslayer Offline
10 point
Sandmtnslayer  Offline
10 point
Joined: Jun 2019
Posts: 3,377
Sylvania Alabama
Originally Posted by M48scout
Download some installation guides from various manufacturers. The ones I read all directly prohibited putting it down on shingles. The thermal expansion scratches the metal underneath causing corrosion. The guides I read seemed to prescribe exactly what marshmud described. That, and placing insulation board in between furring strips (2x4’s screwed to rafters) to displace volume of air that will contain water vapor and condense underneath. The guides also go to a great deal of detail on the screwing patterns around the perimeter (key to preventing uplift and peeling off from wind), and a great deal of detail on the various flashing and sealing. I think even if you are hiring it out it’s a good idea to locate and download 2 or 3 of those product brochures/installation manuals. After educating yourself you can better decide who is a quality installer.

EDIT: BTW depending on how your house is built, finding the rafter centerline at the ridge and eave as you progress across the roof length may not be trivial. The one roof I did was very time consuming because it was not laid out on 16” centers and varied from ridge to eave. I had to probe with screws to establish each rafter and snap a chalk line for each rafter. A professional no doubt knows more tricks than me, but I could see how someone competing on jobs would avoid doing that if possible and the customer didn’t make them.

Exactly what my insurance guy told me just a few days ago


Not all Indians were hunters some toted firewood
Re: Who is the metal roof guru on here? [Re: JayHook2] #3232648
10/01/20 07:50 PM
10/01/20 07:50 PM
Joined: Oct 2017
Posts: 742
East Central Alabama
Be_Cam Offline
4 point
Be_Cam  Offline
4 point
Joined: Oct 2017
Posts: 742
East Central Alabama
Mackdaddy is a professional roofer


A friend, the Bible and a banker will get you though about anything.
Re: Who is the metal roof guru on here? [Re: JayHook2] #3232670
10/01/20 08:08 PM
10/01/20 08:08 PM
Joined: Nov 2015
Posts: 12,916
Old Florida
Geno Offline
Booner
Geno  Offline
Booner
Joined: Nov 2015
Posts: 12,916
Old Florida
Furring strips and put the screws an inch or more into the rafter if at all possible. It adds structural stability to the whole unit when done correctly. I have no idea how to do that other than poking a bunch of holes in the shingles - not a roofer or a carpenter.


Whoever is happy will make others happy too. Anne Frank
Re: Who is the metal roof guru on here? [Re: JayHook2] #3232723
10/01/20 09:09 PM
10/01/20 09:09 PM
Joined: Dec 2010
Posts: 2,479
Northeast Al
M
mackdaddy Offline
10 point
mackdaddy  Offline
10 point
M
Joined: Dec 2010
Posts: 2,479
Northeast Al
I put down a synthetic underlayment over the shingles. I have used furring strips before but only if the homeowner insists on them. There is really no reason for them. Pm me if you have any questions I’ll be glad to help

Re: Who is the metal roof guru on here? [Re: JayHook2] #3232734
10/01/20 09:24 PM
10/01/20 09:24 PM
Joined: Dec 2010
Posts: 16,605
lat 34.09 long -86.13
metalmuncher Online content
Old Mossy Horns
metalmuncher  Online Content
Old Mossy Horns
Joined: Dec 2010
Posts: 16,605
lat 34.09 long -86.13
I've done several over the years but none in the last 8 years. I removed the shingles and felt completely, put down a fresh layer of decking, new 30# felt then the metal. Screws every 8 inches at the facia and ridge, then rows every 24 running inches. No issues with any so far, but I'm not on the coast either.

Re: Who is the metal roof guru on here? [Re: JayHook2] #3232737
10/01/20 09:29 PM
10/01/20 09:29 PM
Joined: Nov 2016
Posts: 824
Oakman, Al
M
Myerz Offline
6 point
Myerz  Offline
6 point
M
Joined: Nov 2016
Posts: 824
Oakman, Al
Just a layer of felt between the shingles and the tin will be fine. The gravel on the shingles will actually over time rub holes in the tin if this is not done, causing lots of issues

Last edited by Myerz; 10/01/20 09:30 PM.
Re: Who is the metal roof guru on here? [Re: JayHook2] #3233527
10/03/20 08:45 AM
10/03/20 08:45 AM
Joined: Mar 2018
Posts: 657
South Baldwin
J
JayHook2 Offline OP
4 point
JayHook2  Offline OP
4 point
J
Joined: Mar 2018
Posts: 657
South Baldwin
Thanks guys! Mackdaddy I will probly lean on you next couple days keep eye on PM box.

Re: Who is the metal roof guru on here? [Re: JayHook2] #3233760
10/03/20 05:42 PM
10/03/20 05:42 PM
Joined: Dec 2010
Posts: 2,479
Northeast Al
M
mackdaddy Offline
10 point
mackdaddy  Offline
10 point
M
Joined: Dec 2010
Posts: 2,479
Northeast Al
I’ll be glad to help


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