Hi Calvin,

There is a Damp Proof Course under the plywood, done with bituminous felt. In addition to that, the damp proof membrane which is under the concrete slab, is dressed up the inside of the base course and lapped under the plywood. The walls are also clad with thin plywood (3 layers 6mm) with staggered joints and again I have taken a bituminous felt down the outer face and lapped across the top of the base course, which has yet to be finished off with a sand stone permiter so keeping all moisture out from all sides.

The walls will be finished with vertical larch boards in a board over board fashion which will come down over the face of the sand stone slightly, to form a water run-off into a stone chip margin round the base. The stone chip margin having underground drianage to divert any surface water away from the building.

I think the photo you are looking at was when I was laying out the plywood as a template, before dpc was then fittted as I used the bottom plywwod template (4 layers of 12mm plywood glued and screwed together with staggered joints) as a template to form the wall kit head ring binder, giving me hopefully a round roof. time will tell if I got that right when it comes to fitting the gutter !