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  1. S

    18mm OSB T&G which way up?

    Yes i see what you mean about the curved tounge, thanks very much, that's very helpful, and thanks for the tip about not screwing the edge down tight.
  2. S

    18mm OSB T&G which way up?

    I'm going to be replacing the flat roof on my garage soon using18mm osb3 T&G 2.4x 600mm (norbord), for a nice flat even finish for the rubber. This might seem like a silly question, but does it matter which way up Iay it? Also, I read that you should use 4 screws across the width of the...
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