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insulation

  • 06-01-2015 1:11pm
    #1
    neadybop
    Registered Users, Registered Users 2 Posts: 12 ✭


    hi all,
    just wondering if anyone can tell me...
    would it be okay and safe to pump expanding foam insulation in to the cubby holes of a dormer room(either side of the velux window).
    instead of getting the whole house pumped with insulation, which i just can't afford at the moment.
    is it simply a case of drilling holes, pumping in stuff then covering holes again?

    thanks in advance


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    I wouldn't - assuming it's standard felt, there needs to be air movement( 50mm min air-gap) between insulation and felt.


  • #3
    neadybop
    Registered Users, Registered Users 2 Posts: 12 ✭neadybop


    its not the roof, its to fill the walls


  • #4
    slimjimmc
    Registered Users, Registered Users 2 Posts: 7,786 ✭✭✭slimjimmc


    Are you taking about insulating the sides of the dormer window where it juts out of the roof or insulating behind the knee wall?

    It's strongly advised to not use cans of expanding foam to insulate confined spaces such as walls. The cans contain propane gas and the foam can be high explosive as one poster found the hard way.
    http://www.boards.ie/vbulletin/showthread.php?t=2057312010


  • #5
    neadybop
    Registered Users, Registered Users 2 Posts: 12 ✭neadybop


    i'm guessing its the knee wall. not too sure. its the wall inside the bedroom


  • #6
    fred funk }{
    Registered Users, Registered Users 2 Posts: 6,827 ✭✭✭fred funk }{


    Can you not insulate from the back, in the crawl space.


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  • #7
    neadybop
    Registered Users, Registered Users 2 Posts: 12 ✭neadybop


    thats what i'm wondering. is the expanding foam ok to use?


  • #8
    slimjimmc
    Registered Users, Registered Users 2 Posts: 7,786 ✭✭✭slimjimmc


    neadybop wrote: »
    thats what i'm wondering. is the expanding foam ok to use?
    Drilling holes in the knee wall and filling with foam won't work because the cavity is far too big, it's not like a 100mm cavity wall. You need to get behind the knee wall to insulate. I wouldn't use foam in a confined space either unless you get a specialist in spray foam insulation, it's too dangerous imo (gassing yourself or blowing yourself up). Better option would be to use rock wool, fibre glass or a rigid board. If you can't get behind the knee wall then apply rigid insulation to the room side.


  • #9
    Robbie.G
    Registered Users, Registered Users 2 Posts: 1,884 ✭✭✭Robbie.G


    neadybop wrote: »
    thats what i'm wondering. is the expanding foam ok to use?

    No it's not suitable for that job.
    You couldn't buy enough foam to fill that gap.
    Is there not access panels into crawl spaces if so use rigid insulation or quilt


  • #10
    neadybop
    Registered Users, Registered Users 2 Posts: 12 ✭neadybop


    sounds like a job for a professional....will have to wait a while
    thanks for all the advice.
    sorry for being such a girl about it!


  • #11
    Searching for Mauser
    Registered Users, Registered Users 2 Posts: 2 ✭Searching for Mauser


    had same question, great stuff!!


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