Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

Attic insulation

Options
  • 09-02-2009 10:04pm
    #1
    missloulou
    Registered Users Posts: 195 ✭✭


    Hi,

    with all this talk of Government insulation Schemes, what depth should the attic insulation be nowadays?

    Thanks

    Lou


Comments

  • Options
    #2
    RKQ
    Registered Users Posts: 2,292 ✭✭✭RKQ


    As deep as possible!
    IMO 300mm of fibre glass is now standard. So if you had 150mm ceiling joist you would put 150mm fibre glass between the joist and 150mm perpendicular to the joists.

    If you did have 150mm deep joists, I'd recommend 150mm between the joists and 200mm perpendicular. Giving 350mm overall.


  • Options
    #3
    JohnButler
    Registered Users Posts: 387 ✭✭JohnButler


    Hi,

    no less than 250mm. That is 100mm between joists and 150mm across joists.

    JB


  • Options
    #4
    shovel
    Registered Users Posts: 439 ✭✭shovel


    Hi.

    Is it ok to leave the wireing between the two layers of insulation.

    I only have about 3" insulation between joists with the wireing on top in my attic which is floored

    Would like to take up the floor and lay more but can't lift the wireing enough to put insulation underneath it.


  • Options
    #5
    RKQ
    Registered Users Posts: 2,292 ✭✭✭RKQ


    shovel wrote: »
    Is it ok to leave the wireing between the two layers of insulation.

    No, insulation can cause the wires to overheat, causing fire. Leave a wide gap beside the cables.


  • Options
    #6
    shovel
    Registered Users Posts: 439 ✭✭shovel


    Cheers, Thanks for that.

    The insulation would be very patchy then

    Cables all over the attic and no give in them at all to put any extra insulation over joists


  • Advertisement
  • Options
    #7
    joefromayo
    Closed Accounts Posts: 1 ✭joefromayo


    What type of insulation do you use in your attic?


  • Options
    #8
    pseudonym1
    Registered Users Posts: 1,092 ✭✭✭pseudonym1


    Matt Cooper was discusing it on his show yesterday - there are grants available to get your attic c tested checking its energy efficinecy. There are stipulations but think it was about a 1/3 of the cost of insulation may be grant aided.
    This creates some jobs addresses energy issues and give builders way of work.


  • Options
    #9
    yop
    Moderators, Home & Garden Moderators, Regional Midwest Moderators, Regional West Moderators Posts: 16,724 Mod ✭✭✭✭yop


    Someone has said that they had started to up the prices of insulation already. Has anyone got a docket with the price of insulation that tehy could give us an idea of what it costs per roll of say Fibreglass, rockwool etc.


  • Options
    #10
    shovel
    Registered Users Posts: 439 ✭✭shovel


    There is only 4" joists and 4" fibre insulation in the attic.ply floor is screwed to 2"x1" lengths which are screwed across joists
    I am thinking of taking up the floor and 2"x1"and lenghten the cables using junction boxes.

    Then put down 6" x2" lengths across the joists and lay new 6" insulation between them and put the floor down again.

    Will i need to use full lengths of 6x2? (expensive!) and could i incorperate the 2x1's somehow to keep the cost down.

    how do i fix the 6x2 to the joist -screws or metal straps +screws?

    any advice appreciated


  • Options
    #11
    shovel
    Registered Users Posts: 439 ✭✭shovel


    sorry lads, post above not showing.


  • Advertisement
  • Options
    #12
    Carlow52
    Closed Accounts Posts: 2,389 ✭✭✭Carlow52


    RKQ wrote: »
    No, insulation can cause the wires to overheat, causing fire. Leave a wide gap beside the cables.

    see the link in this post for current guidance on cable clearance

    http://boards.ie/vbulletin/showthread.php?t=2055483835


Advertisement