Who can discuss standing seam ?

Poodle Head Mikey

So far we have only installed metal roofing as steel sheets such as Century Drain. But a pending project is going to be standing seam in .032 aluminum.

I have some questions -

The existing deck is T&G.

Is a vapor barrier required?

Any benefit or deficit to furring up to create an air space between the metal and the wood deck?

If we do fur up - is the metal roof still walkable? <g>

One issue is that the ridge line has a sag which we are supposed to take out. This will certainly require some kind of shimming. But can we just stringline some purlins level? Or will plywood be required under the metal?

Do any of you routinely install standing-seam?

BTW: The chosen profile is mechanical compression seam - not snap-lock.

Grumpy

There are many metal roof decking underlayments. You would need one. I always install my standing seam on the substrate over the underlayment and see no rason or benefit to fur. Definetly not walkable if you fur. I do not routinely install standing seam but do install a few small jobs every year.

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-Grumpy
Chicago Gutters Chicago Roofing

Poodle Head Mikey

What I have somewhat settled on this project is to strip the shingles and etc. to wood decking.

Stringline and shim the deck level (not overall - just take out the low spots) with left-to-right furring on 12" to 16" centers.

Then re-sheath the entire shimmed-level surface with plywood.

Then put down 1" foam board.

Then install the standing seam over the foam board.

It's about 35 square total but luckily broken up into multiple planes of 5 square or less each.

Will I need underlayment over the foam board?

stephen
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Interloc

YES put underlayment!

red_cedar

never mind