I am making a mirror frame (yes, I did a google search).
I plan to make it for a 36" x 48" x .5" mirror using some free wide pine
flooring that came with my house. I plan to use half-laps for the corner
joints with gorilla glue, and will use a piece of hardboard for the backing
that will not be inside the rabbet I make for the mirror.
Here is my question: given the mirror's dimensions, how much extra space
should I allow for dimensional change of the wood? Should I just cut a rabbet
that will allow exactly a 36" x 48" x .5" mirror, or should I allow slightly
more space? I am a newbie, and would appreciate any advice y'all could give.
Thanks in advance.
Dimensional change will be negligible because wood shrinks and swells
perpendicular to the long grain. In a picture frame wood movement will have
very little effect on your design.
However, I would make the rabbet opening a total of 1/8" or so larger in
each dimension than your mirror, just to make it easier to install the
Wood movement should not be much of a factor providing your frame is not
ridiculously wide ... just allow enough room for easy installation of the
glass: 1/8th all around should be ample.
Consider pegging the half-lap joints with a contrasting wood for extra
strength and appearance.
: Sorry, folks. After posting, I realized that the thickness dimension was
: incorrect. It should read 0.25 inches, not the .5 inches. Whooo, that
: be one heavy mirror, eh?
A tip. General practice is to paint the faces of the rebate with a matt
This helps to avoid showing a reflection of the inside of the rebate.
Jeff Gorman, West Yorkshire, UK
Email address is username@ISP
username is amgron
ISP is clara.co.uk
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