I have tongue and groove houses, plywood rooves with corrugated tin over the top.
And an horrendous red mite problem, despite regular use of TotalMite and diatomaceous earth.
The mites are not in the rooves though, but in the tongue and groove, so I don't think onduline will help.
Presumably those of you using real creosote have enough houses to close up the treated one for a while? How long? I used diesel a couple of times, which was amazingly effective, but I couldn't use the houses for about 3 months.
What do folk make the sides of your chicken houses out of? I think I could do with starting again and burning these......