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  1. #1
    Join Date
    May 2014
    Posts
    4

    Default Preventing car exhaust making its way into a living space

    There are new code requirements in my area (Van.,BC) about car exhaust getting into the house from a garage.
    Weather stripping for the doors and windows is allowed but any ideas for ceilings and walls? Can't use poly on the cold side of the insulation.
    Any experience would be greatly welcome

  2. #2
    Join Date
    Dec 2005
    Location
    Michigan
    Posts
    7,469

    Default Re: Preventing car exhaust making its way into a living space

    Drywall should work.

  3. #3
    Join Date
    Nov 2005
    Location
    VA
    Posts
    1,427

    Default Re: Preventing car exhaust making its way into a living space

    I agree with drywall.

  4. #4
    Join Date
    Jun 2004
    Location
    Georgia
    Posts
    1,808

    Default Re: Preventing car exhaust making its way into a living space

    Some people recommend depressurizing the garage with a fan (on a timer) just to be safe. 100 to 400 cfm should be adequate.

  5. #5
    Join Date
    May 2014
    Posts
    4

    Default Re: Preventing car exhaust making its way into a living space

    Thanks for the replies, it's a strange area for insulation ,vapour barrier and wall penetrations. Making a house air tight, then putting a two car hole in the wall. The man door is supposed to be thermally broken and the door from the garage to the living area can be anything?! In this case it will be solid core for sound.

  6. #6
    Join Date
    Jun 2004
    Location
    Northwest lower MI
    Posts
    373

    Default Re: Preventing car exhaust making its way into a living space

    Drywall should work.
    You might want to read this before making that statement.
    Attached Files Attached Files
    Last edited by Roger P; 05-12-2014 at 08:38 AM.

  7. #7
    Join Date
    Jul 2006
    Location
    Portland, OR
    Posts
    2,430

    Default Re: Preventing car exhaust making its way into a living space

    Depends on whether the code wants you to design against air infiltration or against diffusion. The following would be the absolute best against air intrusion:
    Closed cell SPF on all partitions and ceilings between garage and living space
    Gaskets and self closers on doors between garage and living space (should be doing that anyway)
    No ductwork or HVAC equipment in the garage
    Exhaust fan to create slight negative pressure in garage.

    All good building envelope practice for attached garages anyway.

    Or, better yet, design detached garages with a negative pressure, enclosed walkway from garage to house.

  8. #8
    Join Date
    May 2014
    Posts
    4

    Default Re: Preventing car exhaust making its way into a living space

    Thanks NW Arch. Closed cell SPF is a good call!

  9. #9
    Join Date
    Jul 2006
    Location
    Portland, OR
    Posts
    2,430

    Default Re: Preventing car exhaust making its way into a living space

    I've become a fan of ccspf, in a 2"-2.5" single pass as providing the most bangs for the buck. After that ocspf, compressed fill, or batts, depending on how much insulation PERFORMANCE one is after

  10. #10
    Join Date
    May 2014
    Posts
    4

    Default Re: Preventing car exhaust making its way into a living space

    That and no cross ventilation in vaulted roofs, no vapour barrier in exterior walls. In this particular case the ceiling joists double as deck framing which are very close to sliding doors above... no need for cross ventilation with ccfsp!

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