I'm building an MBC SIPs passive house and investigating cladding.
Doing it on a tight budget and and found a source of Douglas Fir plain boards.
I'm wondering if these, fixed close, or even with a small gap, fixed vertically on battening would provide a sufficient cover for the house, bearing in mind there's a membrane under the battening.
The prevailing wind-ward walls are fairly well sheltered by balconies and brise-soleil-type canopy. Some wind driven rain might penetrate between the boards but should be able to drain/dry out easily.
One issue is that I'd prefer the boards went vertically which would mean there'd be horizontal battens (with wouldn't allow penetrated water to drain down), though these could I suppose be mounted on a second set of vertical battens so provide drainage?
So I'm wondering if I can get away with pain edges boards or should I cough up extra and get profiles ones with overlaps/shiplaps/T&G
Any advice appreciated!
Dan
EastAndWestElevations.pdf
SouthElevation.pdf