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In 2010 there was a small tree in front of the house, which has now become a substantial tree. Trees in front of boxes tend to slow things down. Although the tree has been trimmed somewhat over the winter, one can imagine that it is still a disincentive for the swifts.
So, as a last resort, we have installed a 4-box cabinet facing out over Magdalene College. It faces the same direction as the eaves which contains the existing pair of Swifts.
The front of the box faces south east, so it is painted white to reflect the sun. The box is made of 12mm weatherproof plywood, and the roof is covered in 9mm PVC.
Grooves were cut below the entrances to provide some grip. This might assist the Swifts in gaining their first entry.
The picture left shows how it was constructed. There is a tweeter in the 2nd chamber up.
The cabinet is secured to the wall with anchor bolts which screw directly into the brickwork, without a rawlplug.