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I need at least 24 sheets of 12mm, grooved, cladding plywood.
Though 9mm is available it has only three plies instead of 5 with the 12mm.
11 x 240cm x 88cm for covering the ground floor walls.
12 x 135cm x 88cm for the observatory level walls.
1 x sheet to face the new door.
There will be rather a lot of wastage. Leaving long, narrow strips of 240cm x about 35cm wide.
I can re-use 6 sheets of ply from the octagon's ground floor. These are 240cm high x over a meter wide. So can be sawn narrower and used on the ground floor walls
This sheeting is heavily "tanned" and weathered. So ought to go out of sight around the back. To leave a more uniform [new] appearance on the southern facade where it is always seen. It will weather down soon enough.
The octagon's upper floor used half sheets for only 120cm high last time. So this cladding is not deep enough to clad the upstairs again. However, it might still be useful. For cladding the inside of the obs. walls.
Alternatively, or in addition, the narrow [waste] strips can be butted edge to edge to clad the insides of the observatory. This would help to stiffen the building as a sandwich structure.
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