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  • Window board fastening question. I am milling up some one piece oak boards to replace all the internal cills in our house. I'd like to attach them without any visible fasteners. The deepest board will be about 200 and 30mm thick so perhaps will be some wood movement to contend with. I'll be Osmoing both sides of the boards. It's going onto a solid brick wall (no cavity).

    Can I get away with adhesive alone? I have a tub of sumogrip in front of me which is a polymer adhesive, will it work? Or how about some polyurethane foam adhesive?

  • I glued all my window liners - four sides ~250x19 with a huge rebate. No movement as far as I can see. I used a fully waterproof PU varnish on the under / glue side.

    PU foam is gross. Avoid.


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  • Thanks. What varnish and what glue did you use? Also what's the purpose behind the rebate?

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