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Metal roofing sheets (no condensation)?

A

Anonymous-0

Well-known Member
Going to order some steel roofing tomorrow. Guy suggested I get the condensation stop (translation) panels. They have what looks like a skin on the underside that I guess wicks the moisture up or down instead of forming drops/dripping everywhere. I've never heard of it before, any of you over there saw or used anything like it. Not an insulation, just a cloth(?) like you'd find under a couch or bed spring frame... I like the idea, just don't know if it's worth the extra bucks (not knowing if it works)
 
I had Cleary install on my 42x63 building "bubble wrap" before the metal was installed. No dripping BUT now after 12 years its coming loose on the sides and hangin down. "duct tape" has been the answer there. Im building another building myself..24 x 27 dont plan on putting any in it. Dont know if true or not but if you pave the floor or put a thickness of gravel in it it doesnt do it as bad then with just dirt..??..
 
I think your climate is kind of like ours (western Washington)- humid and rainy in winter, with cold snaps that will just rain on your parade, or whatever else you have going on under a bare metal roof. You definitely need insulation of some kind. I'm re-roofing my shop this summer, because when it was built, the former owner didn't use insulation when built- condensation was so bad that he took off the roof and put on insulation, but then (1) didn't match the nailholes when he put it back on, and (2) lapped it wrong, so it siphons water over the ridges on the edge. Have tried to do patch work, but am finally just going to bite the bullet and do a do-over.

Never heard of a fabric type- I've used both 1" fiberglass insulation with plastic on the underside (comes in about 10' wide rolls), or a sheet that is about the thickness of tar paper, but white plastic sandwiching asphalt impregnated fabric in the middle. Its cheaper than the plastic/fiberglass stuff, and seems to work in my barn, but I've never had it in a closed building.
 
(quoted from post at 22:02:17 07/30/12) I had Cleary install on my 42x63 building "bubble wrap" before the metal was installed. No dripping BUT now after 12 years its coming loose on the sides and hangin down. "duct tape" has been the answer there. Im building another building myself..24 x 27 dont plan on putting any in it. Dont know if true or not but if you pave the floor or put a thickness of gravel in it it doesnt do it as bad then with just dirt..??..
Click to expand...
I used 1/4 " fanfold under my steel roof about 7 years ago and have not had any problems whatsoever

Ken
 
I've got to replace some metal roof panels on my shop soon due to a large branch breaking off. I've never had any condensation problems before due to a material called "fortifiber" being installed underneath the metal sheets. It looks like stiff paper fortified with tar. Works good and I'll be using it again if I can find it.
My other farm building built at the same time rains in the attic really bad. They placed the metal panels over 6 mil plastic which has since crumbled due to the heat.
Whatever you do put something under the metal. I believe the absolutely correct way would be to put plywood down, then 30# tar paper, then the metal panels.
 
I stretched a heavy felt(scrap from a paper
machine) over the purloins before we put the steel
on our shed. I have never seen it drip, but I also
put poly on the gravel floor and covered it with
another type of paper machine fabric, very strong
and I can sweep it clean, just can't weld in there.
You can reduce the amount of moisture that comes out
of the ground but if the air is humid you will have
condensation on bare steel.
 
My 40x60 has an 8" concrete floor (park a bus in it). It doesn't have anything covering the metal and has never "rained" in there. Always thought it was odd. Must be the floor.
 
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