Monday 17 March 2014

Experimental Swift brick

by Dick

In publicising this idea, it is in the spirit of encouraging people to do experiments, rather than an idea that should be rolled out extensively, not yet anyway. The idea came out of the success of the air brick liner Swift bricks at St Neots. 

[Update 2017: Of the 6 boxes installed in 2013, 4 of them had pairs of breeding Swifts this year, and Swifts have explored the other 2, but not settled]

Swift brick with 2 fostered Swifts. Photo Judith Wakelam
The air brick liner Swift brick has internal dimensions: width 175mm x length 200 x height 100mm.

It thus occupies a space of length 1 brick and height 2 courses of brick. We wondered about a brick of height 1 brick - would this be acceptable to Swifts?

So, we built some prototypes out of 5mm thick fibre cement board. These have internal dimensions: width 150mm x length 225mm x height 75mm.

Swift exploring a Swift brick. Photo Clarke Brunt
In 2013, we installed 6 of these on 3 houses, all of whom were playing attraction calls. We managed to get Swifts to enter 2 of the boxes at one site, and we had them clinging to the boxes at a second site.

For the experiments, we have not knocked bricks out of any walls yet, but we have installed them under eaves with a simple wooden harness.

The width of these boxes could extend across the cavity, which, in modern houses, may be as much as 100mm, allowing a box width of 200mm. Also the length could be extended to 1.5 bricks ~330mm long. This would fit well in a Flemish bond.

4 fostered Swift chicks in a Swift brick
If this idea works, it would be the easiest thing to retro-fit into a wall, and may provide least resistance in the housing trade to install many of them in new build. We feel it could be a game changer.

For anyone who would like to have a go at this, please get in touch.

Postscript 2016: 2 of the boxes on one house were occupied by Swifts! The other 4 boxes have been occupied by House Sparrows.

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