The thickness of the wood, which should be at least 15mm to provide insulation and to prevent warping.
It is better
to nail your box together using galvanised nails to stop rust.
Drill a few
holes in the base of your box to ensure that any rain that does get in can
drain out.
Different size holes are suitable for different species:
25mm or
larger for Blue, Coal and Marsh Tit
28mm or
larger for Great Tit and Tree Sparrow
32mm for
House Sparrow
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