|Two chicks looking out of the cabinet. Photo Vic Gatrell|
The gable wall is 2 bricks thick, with no cavity and is built in Flemish bond: a sequence of headers and stretchers. Removal of a header makes a hole all the way through the wall. This was relatively easy, as the bonding was soft lime mortar.
|Two entrance pieces and their moulds|
The mould was made on a 3D printer. This meant the hole could be made to a fine tolerance, with dimensions 65mm x 29mm on the inside and 68mm x 32mm on the outside. Thus it was slightly tapered, allowing easy extraction from the mould and any rain drops would tend to flow out rather than in.
Casting entrances in a mould is a lot easier than slicing up airbrick liners.
|Pam and Vic own the part of the wall |
left of centre. Photo Pam Gatrell
The work also included making a trap-door from an upstairs bedroom into the roof-space.
The end result is very pleasing, and bodes well for the return of a thriving Swift colony in Owlstone Road.
The following pictures should be self-explanatory.
|6 new entrances; the natural colour of the cement/sand mixture|
matches the brick colour remartkably well. Photo Pam Gatrell
|Design drawing for the nest boxes. All boxes are fitted with a perspex back.|
The perspex is held in place with slots top and bottom and slides out sideways
|6 boxes inside the roof-space. Photo Pam Gatrell|