Home Forums Hunting & Shooting Hunter's Campfire Metal Roof OK Over Shingles?

Personally, I would tear off. But, a lot of folks around here seem to go with metal on top of 1x2 or 1x3 furring strips without any issue. If I were going to do that, I would at least use 2" to 3" deck screws to anchor the furring strips...

Metal for this location because asphalt shingles blow off in the heat and high winds.

There are 100 year old roofs in the area covered with corrugated galvanized sheets.

Rainfall is 12” - 18” most years, and most of that occurs in six weeks in the fall and six weeks in the late spring. Some years rainfall is in the single digits. However, a tropical storm can come in and drop 20” in a day or two.

But it mostly is a true desert area.

As said earlier , 1x4 strips every 30” . The last three I’ve done on my places I put reflective insulation under the steel and it really knocksthe heat off. It’s basically bubble wrap with mylar to reflect. No need to strip the roof and don’t put the steel directly on the shingles. I just did a 16x80 single wide and did it in an afternoon with three 50ish year olds. Not really that hard.

Sounds right.


You counldn't beat me hard enough to have an asphalt roof.


No way I would nail through that schit to mount a tin roof.

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This

You see a lot of them around here put on over old shingle roofs with the furring strips, they hold up fine it seems. If it's a trailer camp that's what I'd do, I wouldn't go to the trouble of pulling off the old shingles. Use long screws so they'll go all the way through and get a bite into the decking.

The asphalt was good 20 years ago. But it had started to curl and shingles blow off.

I put three inch screws through firring strips, the shingles, sheeting, and into the rafters. The firring strips are not coming off. And the steel will still be there long after I am dead.

Right on the shingles if you live in a snowy area.Putting them on furring strips is asking for ice dams.

Ideally, I would remove the shingles, apply 60lb asphalt roll membrane, then screw the galvalume over that. The asphalt underneath helps to keep the screws from loosening and provides a seal if they do loosen. Also, asphalt can provide a protective barriere against insect infestation. GD

I nailed 1x4s to the truss on top of the shingles 24inc between 1x4s .cut 4x8 3/4 sheets of foam in haft . been all most 30 years with on prob. you don't have to worry about were you step with the foam between the 1x4s

I wouldn't do it.

Not into it, THROUGH it, and all the way through the decking, too.
With only 1 layer of shingles, especially if they're 3 tabs, weight won't be an issue. The metal isn't enough added weight to matter.

EXactly!

As usual lotta folks here want to make stuff more complicated than it is. We did many dozens of metal roofs using firring strips over shingles without problems and that was in upstate NY where we get plenty of snow, rain and wind..

This.

This is what we did over 20 years ago. The electricity usage for A/C went down by half. We used the silver shiny Galvalume that reflects heat very well. The 1X4s should not be treated wood because the treat starts corrosion and the warranty would be void is what I was told. We have about 50 inches of rain a year and so far so good.

I had weather damage 7 years ago and my insurance company paid for a new roof. I had already replaced one roof 20 years earlier and did most of the work myself. The cost to put metal over shingles with no tear off worked out close enough to the same price as tearing off the old shingles and replacing with new. Seemed like a no-brainer to me. My roofer used furring strips and cut the vent pipes flush with the roof. Everything vents just as well as before and there are no holes in the roof for them. I've been very happy with the results and have noted lower heating and cooling costs as well. This roof will last the rest of my life. Had I gone with shingles I'd be doing it again in another 15-20 years. I hope I live another 20-25 years.

Yup!

If it's one layer of shingles, leave them.
If it's been shingled multiple times, remove them.

Get those shingles off, get a good view of your decking, make sure nothing is rotten.


If all good, cover with #30 with rag felt, mark the rafters and commence to nailing on 1x4 or 2x4 lattice.

Allows for a solid piece of meat to fasten your new metal roofing to.



I've done a couple dozen like this^^


That screwing metal to shingles is a half ass deal. Only if youre lucky will any screws hit a random rafter. Otherwise your punching into brittle 3/8" to 1/2" plywood.
About like zipping screws into a pumpkin rind.