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    elynnster's Avatar
    elynnster Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 30, 2008, 08:57 AM
    vapor barrier needed?
    Installed 9" of spray foam insulation (Sealection 800) in roof system (R=38) in a home in Massachusetts. Bldg Inspector says we need a vapor barrier, but manufacturer says no barrier is needed with this product. Anybody have any knowledge in this area? Does open cell/closed cell make a difference?
    amricca's Avatar
    amricca Posts: 851, Reputation: 92
    Senior Member
    		  
    #2

    Jul 30, 2008, 10:04 AM
    It is a code requirement to have one, that is why the inspector is telling you that regardless of the manufacturer requirements. We switched to semi-permeable vapor barriers on projects because of their breathability and mold issues.

    MemBrain Smart Vapor Retarder
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #3

    Jul 30, 2008, 02:33 PM
    Code is slower evolving that technology and new materials. You may not need a barrier but if code requires it, code trumps the manufacturer. If you provide enough documentation from the manufacturere the inspector might relent.
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