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spray foam insulation

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Comments

  • #52
    RobAMerc
    Registered Users, Registered Users 2 Posts: 5,863 ✭✭✭RobAMerc


    could I batten out the inside of ext walls spray foam the new cavity before I put up plaster board ? or even batten and put up plasterboard and have the cavity back filled with spray foam ? ( no need to shave then )
    thanks


  • #53
    DaveWalsh2020
    Registered Users Posts: 34 ✭DaveWalsh2020


    The vapour control layer is system requirement "consideration". The datasheets don't ask for airtighness membranes. Vapour control layer is €20 airtighness membrane (siga) €150 plus specialty tapes.+/-. some lads have used foil back plaster board s on certain details.


  • #54
    DaveWalsh2020
    Registered Users Posts: 34 ✭DaveWalsh2020


    RobAMerc wrote: »
    could I batten out the inside of ext walls spray foam the new cavity before I put up plaster board ? or even batten and put up plasterboard and have the cavity back filled with spray foam ? ( no need to shave then )
    thanks

    Why dont you use metal studs (tougher). If external wall is damp or exposed treat it. Then an inch or two of closed cell (chemical based is tougher) then spray open cell full fill it and then cut it back. Thats a warm job........... No penny pinching there...


  • #55
    RobAMerc
    Registered Users, Registered Users 2 Posts: 5,863 ✭✭✭RobAMerc


    DaveWalsh2020 wrote: »
    Why dont you use metal studs (tougher). If external wall is damp or exposed treat it. Then an inch or two of closed cell (chemical based is tougher) then spray open cell full fill it and then cut it back. Thats a warm job........... No penny pinching there...

    would this be much more expensive than simple dry lining ?
    Its actually a cavity wall but the cavity is too small to be worth filling.


  • #56
    DaveWalsh2020
    Registered Users Posts: 34 ✭DaveWalsh2020


    RobAMerc wrote: »
    would this be much more expensive than simple dry lining ?
    Its actually a cavity wall but the cavity is too small to be worth filling.

    It would be expensive...If there is a cavity (Blockwork) Id insulate it. Either beads or slow pour spray foam.This can be done later if your managing budget. But thermally lined plaster boards are the best method for insulating as they stop conduction right at source(air within the home). Id get the biggest and best ones. The trick with them is to seal them as you build them onto the wall. Seal them into place with a carlite gypsum compound or another to stop air movement.
    Im thinking you have double leaf blockwork with a small cavity 40/50mm.

    You would want thermally lined walls and cavity filled. Use what you have (safely)........


  • #57
    RobAMerc
    Registered Users, Registered Users 2 Posts: 5,863 ✭✭✭RobAMerc


    DaveWalsh2020 wrote: »
    It would be expensive...If there is a cavity (Blockwork) Id insulate it. Either beads or slow pour spray foam.This can be done later if your managing budget. But thermally lined plaster boards are the best method for insulating as they stop conduction right at source(air within the home). Id get the biggest and best ones. The trick with them is to seal them as you build them onto the wall. Seal them into place with a carlite gypsum compound or another to stop air movement.
    Im thinking you have double leaf blockwork with a small cavity 40/50mm.

    You would want thermally lined walls and cavity filled. Use what you have (safely)........

    thanks.
    Is there somewhere I can find out how to prepare the walls for sticking the boards to them ?
    sorry to derail the thread.


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