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Where'd you get that idea from Stewie? It makes for a pretty thick wall, but I love the fact that there are two air gaps -- brilliant for thermal efficiency.
Just lots of research and tossing a few ideas around with a builder I drew plans for a while back. He finished his house a few months before christmas and most of his outside walls are 70mm MgO board. We were working out total R-values and it is similar to how he did his place. His biggest lament was running wires and pipes in his walls. Because he used metal battens horizontally they had a few issues running the services in the walls.
The 30mm space is the still air gap for thermal reasons whereas the 40mm ( I'm going to reduce that down to 25mm ) is where cables and pipes will be run.
I looked at the permicav a while back and have been weighing up a few options.
I'm basically trying to get the outside walls upstairs and downstairs to around R-5.0.
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Condensation would be my only issue with your setup. Doesn't the polystyrene create a moisture barrier (something you don't want in cooler climates)?
Maybe but I think the two air gaps will help a little with that.
We are only in a temperate climate here ( about 1.5kms from the sea ) and don't get the range in temperatures that you'd see down in Tassie.
I've lived in this place since 1995 and have only once seen a hint of frost on my windscreen early one morning.
By the way your house is looking really good. You must be pretty pleased.
Stewie