metal roofing

bowhunter

i just had a metal roof put on my new home and am getting a lot of moisture on inside of osb, had gable vents and ri soffitt vents wa s told both are to much,what is my answer to stop so much condensation?need help pleqase answer thank you,was told to plug gable vents to let air in threw soffit and out ridge,it helped but still doing it,what can i do thank you

MJW

Was the metal applied directly to the OSB?

jlhaslip

metal roofs will 'sweat'.
the roof sheathing should have had black paper and strapping as a ventilation route.

Tom Struble

do you have any vents,venting directly into the attic? you need to get a handle on moisture coming from the living space that is making its way into your attic

bowhunter

yes metal was put on over black paper and osb ,that is how home depot told me to install it,yes got soffit vents and gable vents but gables are plugged,it helped alot but not all togeather,please help thank you

jlhaslip

what pitch is your roof?

MJW

Go back to Home Depot and tell them they are NOT Contractors and should NOT be giving advise!! Then, ask them what they are going to do, to fix your problem.

IMO, the entire roof needs to be redone correctly by a professional.

Gary in WA

The National Roofing Contractors Association (NRCA) recommends a layer of asphalt-saturated felt between the insulation layer and standing seam metal roof to provide a drainage plane in buildings with high potential for condensation. The NRCA Roofing and Waterproofing Manual recommends using a vapor retarder with a permeation rating of 0.5 perms or less in certain climate zones. When installed with sealed (taped) joints, highly water-resistant XPS insulation eliminates the need for these additional layers (see Figure 7). From: http://www.roofingcontractor.com/CDA...00000000484938

http://docs.google.com/viewer?a=v&q=...oCq-P91xd-Qiaw

Your attic venting isn’t enough or the heated air from the living space below is more than the venting. http://www.rd.com/how-to-seal-attic-...icle18158.html

Homework: http://www.fureyco.com/content/image...ng_The_Air.pdf

http://www.airvent.com/homeowner/pro...it-specs.shtml

http://www.buildingscience.com/docum...on?full_view=1

Stack effect: http://www.wag-aic.org/1999/WAG_99_baker.pdf

Be safe, Gary

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