An inspection of the boxes found that 2 were occupied by Swifts.
UPDATE 8th July 2012
A pair of Swifts has been seen entering and roosting in the box to the left of the drainpipe.
UPDATE 20th June 2012
Contributed by Dick
These tailor-made boxes were installed in Chippenham, Cambs at my son and daughter in law's house. This is another example of eaves with joists, this time supporting a fascia board.
|2 single and 2 double boxes. The Box of Swifts speaker is|
installed on the double box next to the drainpipe
|4 boxes (6 nesting places) before installation|
So for three of these 550mm gaps, we built two double boxes and a long single box. The dimensions of the double box nesting places were 255mm x 210mm, which should be big enough. The separating wall in the double boxes does not extend to the top, allowing light from one entrance to shine through to the opposite box.
All of the boxes were installed by removing the bottom, a single screw into each adjacent joist, then replacing the bottom.
The installation was finished off with a Box of Swifts.