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Insulated Plasterboard on external walls

  • 30-10-2008 11:44am
    #1
    Builderfromhell
    Registered Users, Registered Users 2 Posts: 1,570 ✭✭✭


    I regularly put something like Xtratherm thin R on inside of already insulated cavity wall to give extra insulation to house extensions. Currently I'm applying this to a large house extension with a fireplace.
    The thing I'm not sure about is what to do when I come to the fireplace on the Ground floor and the chimney breast on the 1st floor.
    Should I just insulate as far as the fireplace or around it. My fears are;
    1. If I don't insulate do I risk a cold bridge.
    2. If I do insulate do I create a fire risk as this insulation does burn.

    This or similar is what I use ;
    http://www.xtratherm.com/products/thinrthermalliner.php


Comments

  • #2
    hiscan
    Registered Users, Registered Users 2 Posts: 1,105 ✭✭✭hiscan


    sand and cement and skim the chimney breasts


  • #3
    Penn
    Registered Users, Registered Users 2 Posts: 34,723 ✭✭✭✭Penn


    yeah, fire stop. The website you linked to shows it in the diagram.


  • #4
    muffler
    Registered Users, Registered Users 2 Posts: 46,545 ✭✭✭✭muffler


    I think you need 200mm min. blockwork between flue and insulation so you would need to avoid the chimney breast and stack if its a standard construction.


  • #5
    Builderfromhell
    Registered Users, Registered Users 2 Posts: 1,570 ✭✭✭Builderfromhell


    muffler wrote: »
    I think you need 200mm min. blockwork between flue and insulation so you would need to avoid the chimney breast and stack if its a standard construction.

    Just got off phone to Xtratherm and they concur with above.
    I'm thinking cold bridging might not be such a problem as blockwork is so thick, fire may be lit on cold days, and higher spec. insulation is in cavity behind chimney.

    Appreciate quick replies guys and girls.


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