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  1. #1
    Join Date
    Oct 2007

    Default Attic ventilation - experts can't agree -

    Hi - I am remodeling my attic

    - the house is about 110 years old
    - the roof consists of cedar shingles
    - there is no attic ridge vent or sofit vents
    - the shingles are nailed onto nailers that run horizontal across the rafters
    - through that a good part of the shingles is openly exposed
    - I am planning to put insulation up into the roof in between the rafters to make the attic a liveable space

    I understand that I have to leave a space in between the insulatiuon and the cedar shingles for air circulation.

    the disagreement between 2 contractors is the following:

    1. I need to build in a ridge vent and sofit vent to allow complete air flow...

    2. The other person says, that I can put the insulation all against the nailers (which are 3/4 inch thick), because of the nailers I have an airspace between the shingles and the insulation, also because of the nailers air can flow horizontally across the roof/in between rafters. He says that the cedar shingles breathe enough and even so their is no top level ridge vent enough air can move and leave the under the roof.

    I understand that option 1 may be ideal, but obviously it is also intrusive and more expensive ...
    do you have any views?

    thanks, Chris
    Last edited by walenta; 10-24-2007 at 09:13 PM. Reason: change notification type

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