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Installing Insulated Flooring

  • 28-02-2024 04:22PM
    #1
    Pandoras Twist
    Registered Users, Registered Users 2 Posts: 1,375 ✭✭✭


    Hi All,

    Not sure if this question is more suitable to the Construction forum?

    I'm planning on using these boards to create an insulated floor in my attic. Just for maintenance/storage. I'll be putting rockwool sitting on top of the joists in any areas not covered by the boards (there's already 100m fibreglass within the joists)

    Insulated Loft Decking Boards 14.4m2 - Unilin Thin R (XT/Walk-R) - MyBuildingSupplies.ie

    The house is a 1940s end of terrace with quite thin joists (3 cm joists, 30cm apart) so the insulated board seems like a much better flooring option than rockwool plus loft legs plus OSB.

    I'm having trouble reading the installation instructions: 102604-Xtratherm-Thin-R-Walk-R-Web-v4.pdf (mybuildingsupplies.ie)

    1. Boards should be be laid transverse to the joists, spanning minimum of 4 joists at 400mm centres.

    2. Pre-drill the Walk-R panels and secure with wood screws. Screws should penetrate joists by 30mm and be placed no closer than 25mm from any panel corner. Do not over-tighten the screws.

    3. Ensure that no electrical cables are damaged or compressed between the Walk-R panels and the joists. Mark the top of the panels to indicate the positioning of any services below the walkway.

    4. Ceiling joists are not designed to take a floor loading, loads applied should not be excessive. If loading other than maintenance traffic or light storage is required, an engineer should be consulted

    Point 1:

    • The boards are rectangular so is Point 1 saying I lay them perpendicular to the joists? And they have to go across a minimum of 4 joists? And the furthest apart the joists can be is 400mm?
    • If so, am I supposed to trim the excess?

    30mm joist + 300mm gap + 30mm joist + 300mm gap + 30mm joist + 300m gap + 30mm joist = 1020m and the boards are 1200m

    Point 2:

    • Is it saying I need to drill the entire way through the board and the joist with a wood screw? Or is there some other really obvious way that I'm supposed to attach the board to the joist?
    • Can boards share joists? Like can I drill two boards into the same joist or how am I supposed to cover the whole area in boards?

    I think point 3 is fine, as our electrics are outside of where the boards will be going. And I think Point 4 is just saying, this isn't a real floor, don't be dancing on the boards.

    Any guidance at all ye can give me is greatly appreciated!

    Thanks!



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