|The mould is made out of a 50mm piece of a pipe 102.5mm|
internal diameter. The entrance formers are 3D printed.
Michael Osborne did something similar here.
We have used the same 3D-printed former that we used for the half brick entrances, but this time we made a mould out of a piece of 4 inch pipe.
The internal box could either be embedded in the inner wall or inside the inner wall, typically in a roof space, accessed via a pipe.
Although we have not used this idea on a real project yet, we thought it worth sharing.
Computer generated pictures below:
|Outside view of insert|
|In this case, the nest box (back removed) is inside the roof-space .|
Alternatively the nestbox could be embedded in the inner wall, spanning the cavity.