Others will have much more experience than me, but here is my limited success
Early last year I used 12 mm marine grade ply (from Bunnings, two sheets
cost near $100.00) to build half a dozen nesting boxes which resulted
in a number of successful nestings so far. How long the boxes
last remains to be seen but I would expect them to last 5 - 10 years without
too much maintenance. Building something that lasts a while, I suggest,
is important as the easiest bit, by far, is to build the nest boxes.
It is much, much more difficult to get a big nest box, such as one
for a Barn Owl, fixed securely 25 m+ up a big tree.
Dont be surprised if some birds do not read the books on nest
boxes & do not always nest where the books say they should, for example,
I had Galahs nesting in an "Barn Owl" nest box (unfortunately no
owls to date.)
have several sources of information about the construction of nest boxes.
I wish to construct a number for my block which is being revegetated. But
I can never find reasonable wood at the local stores. One book says look
for exterior grade ply around 3-4 cm thick (insulation against hot temps.)
I cannot find anything like that. Bunnings would have 25 mm chipboard,
or 12 mm ply. Can anyone suggest a source of suitable wood, please?