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  1. #1
    Join Date
    Jan 2005
    Location
    Sydney
    Posts
    37

    Default Architrave Moulding

    Hi Guys

    I want to know why a rebate channel is cut on underside of most architraves

    I have just received some 75 x 16mm WRC that has been milled square cut and no rebate underside. I will be fixing on exterior of house against weatherboard and window frame. Will this matter that no rebates ?

  2. #2
    Join Date
    Jan 2006
    Location
    Melbourne
    Posts
    722

  3. #3
    Join Date
    Jun 2003
    Location
    Gatton, Qld
    Age
    49
    Posts
    34

    Default

    David,

    did you get your answer from the provided link?

    Basically when you have a DAR board, it will react to moisture evenly/predictably, when one face is machined in the case of architrave/ moulding/door sills etc. The machining increases the surface are of that face of the board - meaning it will absorb more moisture in a given situation that it's flat face, this will produce a cup in the board.

    To counteract this, manufacturers machine the rear face to even up the surface area to reduce the likelihood of the boord cupping due to variances in moisture uptake/loss due to surface are differences.
    I love my Lucas!! ...just ask me!
    Allan.

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