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Thread: Chair Moulding

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  1. #1

    Question Chair Moulding

    Installing moulding in bath on top of waiscotting and question is inside corners are not perfect to just cut two 45's, what is the best way to get clean corner joints with the mouldings?

  2. #2
    DIY Member maddfrog's Avatar
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    There are two approaches for inside corner trim:

    The first is to mitre the corners. Since corners are rarely exactly 90 degrees, take two pieces of scrap and try different angles until you find the perfect angle. Make sure you always use the same angle on both pieces or they'll never mate right. Also, make sure the scraps are reasonably long. Walls usually aren't perfectly flat and that variation can cause very short pieces to fit together at a different angle than longer ones.

    The second approach, which can take a bit more time, is to 'cope' the corners. With this approach, you'd run one piece straight into the corner, with maybe a small back-bevel to allow it to fit into a corner that's less than 90 degrees. You then 'cope' the other piece so that end of the piece has the same profile as the face of the other piece. A picture's worth a thousand words, so try this link:

    http://www.kelleher.com/documents/Coping.pdf

    Mitreing inside corners is the approach that's usually taken by less experienced folks because it's a little easier, but it rarely looks as good as coping, especially after a few seasons of expansion/contraction with humidity changes. Coping also makes you feel like a true craftsman and will impress your friends and neighbors.

    Good luck.
    Last edited by maddfrog; 11-10-2006 at 10:28 AM.

  3. #3

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    Quote Originally Posted by CLYDE
    Installing moulding in bath on top of waiscotting and question is inside corners are not perfect to just cut two 45's, what is the best way to get clean corner joints with the mouldings?
    I had a similar problem with wainscotting (bead board). I tried mitering every possible angle without success. Finally, I nailed in some quarter-round in each corner and ran the cap molding flush up to it without mitering at all. It looked pretty good. I'll have to experiment with the coping approach next time.

  4. #4
    DIY Member maddfrog's Avatar
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    One more comment on coping - the document I linked to shows two different approaches to transferring the profile of the moulding to the piece you're coping. I personally use the mitre-then-cope approach rather than the trace-then-cope approach. It's faster and more accurate.

    Also, the article doesn't mention it, but I find that rat-tail and half-moon files are very useful for fine-tuning the fit of your coped piece.

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