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metal roofing

2K views 7 replies 5 participants last post by  Gary in WA 
#1 · (Edited)
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
 
#8 ·
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/CD...icle/BNP_GUID_9-5-2006_A_10000000000000484938

http://docs.google.com/viewer?a=v&q...YOx1V4&sig=AHIEtbRO3lwafrsEmGYkoCq-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-air-leaks/article18158.html

Homework: http://www.fureyco.com/content/images/Ventilation-_Clearing_The_Air.pdf

http://www.airvent.com/homeowner/products/intakeSoffit-specs.shtml

http://www.buildingscience.com/documents/digests/bsd-102-understanding-attic-ventilation?full_view=1

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

Be safe, Gary
 
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