After much searching for different types of insulation I discovered this flexible foam cell sheet with "aluminium" foil coatings on each side.
The sides are slightly different so there is a directional characteristic with "silver" on the outside and "gold"on the inside. It's better at keeping "things" out than in . . .
It also works best with an air gap on the "outside"and has an R factor of about 2.8 when used in this manner. Polyurethane needs to be about 50+mm thick to achieve the same rating and is not self supporting, unless bonded in between two panels it will disintegrate over time.
Not cheap but then nothing is.
So starting in the shower corner (which will determine a lot of the other dimensions) the sheet is cut to length and then held in place with 9mm thick x 50mm wide strips of ply screwed about every 200mm. This leaves a 25mm air gap in between all the structural components which are thermally isolated from the interior wall.
A sheet of 9mm thick ply is then screwed over the top of the battens for a ceiling and the appropriate cutouts made for exhaust fan / vent and lights and the cables pulled through.
Additional sheets of 12mm ply are then screwed over the top of the battens for the walls in the corner.
In addition if you look "real close" you can see the walls have had the lower portion routed out to make the shower base sit flush with the wall so a sheet of "melamine" can be overlaid and sealed to form the waterproof walls and ceiling.
The drain fittings are then installed to the shower base by cutting out with a hole saw and applying the appropriate sealer / adhesive to the fittings
Taking care to mask everything off with tape
So that when it's finished and cleaned up it looks like this
from the top and like this from the bottom
As a bit of "comic relief" the junction box for feeding the wires from the solar panels was also fixed to the roof and the the wires fed in from underneath. Care is taken at this point as the roof can end up being a bit of a "swimming pool"with a 3mm edging all around.
Once all the fittings are dry in the base a cutout is made in the floor for the drain to go through, the wall recesses and the base of the shower are also Soudaled (?) ( the base of the shower was previously leveled with various thicknesses of timber Soudaled in place).
This is then placed in position and screwed around the top edge to get the inside if the shower base flush with the wall so that that the melamine can go over the top and make an effective seal.
With the shower base in place a third (internal) wall can also be constructed out of 12mm ply rebated for the shower base.
This wall is framed in 40mm x 19mm thick straight strips of timber which will have another sheet of 12mm ply over the other side. The hot and cold water pipes will come up through the floor in the middle of the wall and the shower fixtures can then be mounted to the inside wall.
With the wall now (partially) framed its time to extend the insulation further down the roof and walls before continuing the bathroom fit out.
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