Insulating a Pole Bldg Ceiling-Moisture Present!
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Topic: Insulating a Pole Bldg Ceiling-Moisture Present!
Posted By: nowaktj
Subject: Insulating a Pole Bldg Ceiling-Moisture Present!
Date Posted: 30 Nov 2018 at 5:06am
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Hey guys-I am getting ready to blow insulation into my pole building but the weather has caused moisture to get trapped between the plastic and the ceiling tin.
Should I wait for this moisture to be driven out (next spring) or would you blow in the insulation on top of the plastic and no problems will occur?
I am concerned that if I insulate now, this moisture may be "trapped" for a longer period of time and cause the ceiling tin to rust.
Thoughts??
Thanks in advance for the help, Terry
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D19D, D17D, WD, WC, Snobee, #83 Plow, SC Blade, 14' disk, 400 series planter, B , Terra Tiger, M Dozer w/Baker Blade, TL-12, 42S Grader, G
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Replies:
Posted By: shameless dude
Date Posted: 30 Nov 2018 at 7:21am
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the moisture should evap if it's between the plastic and the tin. even if it did stay in there, it wouldn't rust thru for 50 years or better. i'm thinking that's why you put the plastic in there in the first place was to keep moisture outta the inside of the building?
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Posted By: Dakota Dave
Date Posted: 30 Nov 2018 at 8:08am
I blew insulation in mine last December when I took some panels back down to install the lights it was dry between the steel and the moisture barrier. As long as your heat source is outside vented it'll dry out.
If your using a non vented heat you'll just be putting more moisture it the building.
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Posted By: AC7060IL
Date Posted: 01 Dec 2018 at 2:09pm
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If I'm correctly imagining how your building is designed, outside air is always going to be between plastic & tin. If that's correct, then yes insulate from plastic toward inside of building. Like already said, the plastic is your vapor barrier from outside air(natural humidity & condensation from temp differences).
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Posted By: nowaktj
Date Posted: 01 Dec 2018 at 4:36pm
Thanks guys. I think what happened is that I have the walls insulated without the floor being concreted. I think when it turn cold all the moisture in the building kind of got trapped in there. I am going to try and blow in insulation tomorrow morning. The middle of the week here I let it air out if we had lows near 10 Fahrenheit. That seem to suck some of that moist air out. I have also put in a ceiling fan so I should be able to get the air moving.
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D19D, D17D, WD, WC, Snobee, #83 Plow, SC Blade, 14' disk, 400 series planter, B , Terra Tiger, M Dozer w/Baker Blade, TL-12, 42S Grader, G
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Posted By: Gary in da UP
Date Posted: 01 Dec 2018 at 5:11pm
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UP north Steel roofing on new construction has a half inch of black celotex under it for insulation and vapor barrier, paper faced fiberglass R33 finish ceiling and then insulate further if you need it, can't have too much insulation @ zero and below Celotex directly under the steel is a must have if you want dry insulaion.
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Posted By: HudCo
Date Posted: 01 Dec 2018 at 9:34pm
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we are going to spray 2" of closed cell foam in our roof then 2" of open cell. the closed cell will seal it up and pravide a vapor barrier also our heat is very dry
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Posted By: Dusty MI
Date Posted: 02 Dec 2018 at 7:56am
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Last I knew the vapor barrier needs to be on the heated side. Heated air holds more moister than cold air.
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917 H, '48 G, '65 D-10 series III "Allis Express"
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Posted By: DMiller
Date Posted: 02 Dec 2018 at 8:03am
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Not on steel. You want to keep the moisture/moist air away from that cold metal to prevent condensation. A couple of thoughts from around here. A insulator that foamed our home stated he sprays a open cell product directly to the underside of barn roofs. Two factors one the open cell allows the foam to breath while still keeping moist air off direct cold metal contact, two the open cell allows for drain-off of any roof leaks rather than strip the product off the bottom of the sheeting. I had simple house wrap laid across the trusses on our barn, did not fully stop condensation and dripping but is Nowhere near to as bad as a open under-skin roof at a neighbors.
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