Have you considered creosote?. A dark colour and decent protection, it's a bit smelly to begin with but when you consider modern tanalising for timber is almost worthless it might be an option..
I know they have to be technically movable but I assume the hut is normally fixed in place? Just wondering about the slope...
And sorry if I missed it but what is the roof made from and did it come curved?
I can't believe it's two weeks since I updated on my progress!
Anyway, I'm down to those little jobs that seem to take forever. The inside has been completely panelled and painted, the floor has been laid and has now had two coats of antique oil/wax.
There's still a skirting and some finishing beading to put on. Plus, the window handles and locks haven't arrived yet; for some reason Ludlow Foundries stopped making the ones I originally wanted - the windows are held shut with some temporary bolts. I was thinking of painting the cross-beam and ridge but I've decided to stain them instead. Then, hopefully later this week, the log burner is going in (I'm still waiting for the corrugated roof cowl).
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Looking great Andy.
A friend of mine built a bit of a hybrid Shepherds hut / Gypsy caravan so I'll drop these pictures here for inspiration.