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Blown insulation - will it stay in one piece when changing windows?

  • 27-09-2009 9:56pm
    #1
    soldsold
    Registered Users, Registered Users 2 Posts: 555 ✭✭✭


    Hi,

    I am getting the cavities filled with blown EPS before externally insulating (renovation). Filling the cavity will reduce thermal looping in the cavity.

    Can I expect the EPS beads in the cavities to be bonded together and not come out and leave holes with no beads when I am replacing the windows when externally insulating the walls later?

    Thanks,

    Steve


Comments

  • #2
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,907 ✭✭✭✭CJhaughey


    I wouldn't think so, AFAIK blown EPS is just small beads of loose polystyrene blown in, it is like beanbag material but finer.
    If you pull a window out I would imagine it to be messy.


  • #3
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    99% certainty that the cavity is closed at window openings . Very unusual for them not to be so the EPS beads will remain in place


  • #4
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    most modern installations of polystyrene beads will have a glue like substance incorporated. this will keep the beads in place if changing windows etc.

    however, when it was first introduced, say 8+ years ago, it was common to pump the beads in loose.

    therefore, simply demand the installers use an IAB or BBA certed product that has the glue incorporated.


  • #5
    soldsold
    Registered Users, Registered Users 2 Posts: 555 ✭✭✭soldsold


    As I suspected.

    Thanks!
    Steve


  • #6
    firesidechat
    Registered Users, Registered Users 2 Posts: 265 ✭✭firesidechat


    The cavity WILL be open at all windows.


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  • #7
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    firesidechat wrote: »
    The cavity WILL be open at all windows.

    why would you be so sure?


  • #8
    muffler
    Registered Users, Registered Users 2 Posts: 46,547 ✭✭✭✭muffler


    firesidechat wrote: »
    The cavity WILL be open at all windows.
    Why? Did you build the house originally?


  • #9
    soldsold
    Registered Users, Registered Users 2 Posts: 555 ✭✭✭soldsold


    muffler wrote: »
    Why? Did you build the house originally?

    :D


  • #10
    firesidechat
    Registered Users, Registered Users 2 Posts: 265 ✭✭firesidechat


    There are two methods to building block walls for houses.

    A double layer of 4inch blocks with a cavity in between either
    for rigid insulation or for the pumped in products,
    All window and door openings are unsealed..

    The other method which is not very common in houses although
    it is used quiet often in building garages,Is to lay a course of 6inch cavity blocks which would be sealed at the openings BUT this system does not accept the pumped in insulation,it is not cost effective nor is it reliable.:D:D


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