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Old 06-30-2020, 07:32 PM
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Shade Tree Welder Shade Tree Welder is offline
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Default Steel roofing.

I am going to need to put a new roof on the shop and the house soon. I was
thinking steel. Who has done it, meaning put it on your house, shop etc.
Would you do it again. Can you put it over an existing asphalt shingle roof?

Just some longer term planning and research.
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Old 06-30-2020, 07:42 PM
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Quote:
Originally Posted by Shade Tree Welder View Post
I am going to need to put a new roof on the shop and the house soon. I was
thinking steel. Who has done it, meaning put it on your house, shop etc.
Would you do it again. Can you put it over an existing asphalt shingle roof?

Just some longer term planning and research.
Yes, everyone around here like to slam some 2x4 purlins down on top of an old shingle roof and call it good.
Can doo it in a rainstorm, so they love it that way.

I just had my parents old farmhouse (built in 1900 24' sq. 12:12 pitch)
I insisted they strip off all shingles, and NO purlins.
I wanted to get rid of the old shingles that would be cooking off and become
a fire hazard, along with reducing weight on the old structure.

A call the metal manuf, they explained you can put steel onto the sheeting, but
use 90 felt paper/ice guard/sharkskin material underlayment.

Steel can't set right down onto wood.

So I don't have a "thick" roof, and with the steel tite to the roof, I don't get the noise when it rains hard.

During the roofing job, no less than 2 local places burned to the ground, the fire chiefs blamed the steel roofing job, with the purlins created a airspace
that they couldn't get water to, filled with dried out shingles.
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Old 06-30-2020, 08:10 PM
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I'd go steel again. For the love of all things start it square. Ask me how I know.

It can go over a shingle roof I do belive. Using furring strips perpendicular to the metal roofing is how I've seen it done.
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Old 06-30-2020, 09:23 PM
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my warehouse had purlins put over the old shingles and it was fine,until hurricane Michael came to visit.
9000 feet of roof in a big roll...
it rolled the roof right off the roof,purlins and all.
If the purlins had been screwed down it may have stayed in place,nails just don't cut it.

But,right now,today,i reroofed a 12x24 shed i have at the beach,i stripped the old metal off and put new steel roofing on it,adding an overhang front and back and on each end.
Insulation was placed under the metal.
The old roof was aluminum,and damaged in the hurricane too,i patched it to buy some time.
I did use the thicker steel,they have 2 gauges down here,i went thicker because of the storms.
I reroofed my moms house years ago,i stripped it with 2x4;s and put metal over that.
Its still working fine.

But,and you all may laugh,i had an RV park in Fl. that was run down when i bought it,every roof was shingles and all were old and in bad shape,but none were leaking.
I bought about 30 gals of tan latex paint and painted every roof on the place,it looked good and glued those old shingle in place.
I sold the place and the gal that bought it told me she reroofed it 20 years later,she got 20 years out of the roof after i painted it.
I used a roller and rolled that latex right over the shingles.

My buddy is painting the roof of a rent house right now down here at the beach,saving a bunch of money.
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  #5  
Old 06-30-2020, 09:45 PM
slip knot slip knot is offline
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I reroofed my mom house 15ish years ago with metal. I went straight over the old shingles with it. I did get longer screws for fastenall to ensure they got penetration thru the old shingles. I also installed some snap down hidden fastener sheets on the back that had a really low pitch, like 1:12. its held up fine. no leaks and way cheaper than the hot mopped tar. The roof went thru a cat4 hurricane without any noted damage. it just washed off some of the mold.

My shop roof is 4:12 and its a little steep for me. I had it built back in 2004 and had to crawl up there to inspect the work the illegals were doing. I was shaky back then and don't think I would even crawl up there now. Don't bounce like I used to.

There are several gauges of metal, get the thickest you can afford. and don't skimp on the screws, closure strips or sealant strips. The manufacturer has a screw schedule follow the high wind schedule even if you don't get high winds, don't skimp on the screws.
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Old 06-30-2020, 10:28 PM
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Got 5 buildings here and all are metal. I use the thin gauge. You all have heard we get some mighty hard winds here, and never had a roof come loose. Some have been replaced due to hail damage. Insurance covered it all. Always use the metal roof sheeting. It seals all the screws.

I would never put metal over old shingles. Asking for screw leaks due to uneven surface. Metal works real well on flat surface. Tighten screws only till you see the rubber washer paint just begin to crack. Too tight you put a divot in the metal.

Last advice is never get on your metal roof with when wet. Even a light dew and you will be sliding right over the edge. I use Pro Panel brand metal.
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Old 07-01-2020, 03:52 AM
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if you're not using purlins (and I find it hard to argue with doug's logic of fire hazard and noise) then there's no point in using heavy steel.

you will want to make sure you do a real good job stripping the shingles and removing nails though or they will show as dimples in the tin.
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Old 07-01-2020, 05:25 AM
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Probably removing shingles and then using new tar paper underneath would be the best. Otherwise it may collect a lot of dew and rot the roof wood.


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  #9  
Old 07-01-2020, 06:42 AM
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We have put steel on mine and my sons house . Mine we stripped 3 asphalt and a cedar .Just used the purloins of the old cedar . It has 10 years on half and 20 on the other half .
My sons was over roofed . It went on over 3 asphalt layers by a pro company . The house next door was roofed yesterday . pro company , over 2 asphalt .
Mine is a 6-12 pitch ,sons is a 4 -12 pitch .
Yes I would do it again . It should see me dead .
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  #10  
Old 07-01-2020, 07:52 AM
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Quote:
Originally Posted by midmosandblasting View Post
We have put steel on mine and my sons house . Mine we stripped 3 asphalt and a cedar .Just used the purloins of the old cedar . It has 10 years on half and 20 on the other half .
My sons was over roofed . It went on over 3 asphalt layers by a pro company . The house next door was roofed yesterday . pro company , over 2 asphalt .
Mine is a 6-12 pitch ,sons is a 4 -12 pitch .
Yes I would do it again . It should see me dead .
Mo, did the pro companies use purlins or just steel down on new felt over the shingles?
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