I'm not sure that my Eglu coop provides sufficient ventilation. It probably just about meets the 1 to 10 rule but there's no control over the ventilation and in summer I'll be leaving the back door propped open at the top.
The run is wire mesh but cladded with corrugated PVC in winter and spring. The narrow gap that between the PVC and the roof is easily one-tenth of the distance to half-way across the run, so that ratio is ok. Last year everything was fine, nice and dry and no draughts.
However, this year, we've had a wet winter, and there's been condensation on the roof each morning, enough to need wiping off so that it doesn't drip.
In addition to the damp weather (high 90s % humidity all the time) the ventilation from the windy end of the run has been slightly reduced this year because I added a makeshift extension in a hurry. (Avian flu cases were increasing rapidly and poultry would need to be brought inside.) The 'windows' in the extension are chicken-level and square, and face the prevailing wind that brings the rain, so they need to be closed against wind and rain; otherwise there are muddy patches inside the run, from the rain blowing in.
The run is wire mesh but cladded with corrugated PVC in winter and spring. The narrow gap that between the PVC and the roof is easily one-tenth of the distance to half-way across the run, so that ratio is ok. Last year everything was fine, nice and dry and no draughts.
However, this year, we've had a wet winter, and there's been condensation on the roof each morning, enough to need wiping off so that it doesn't drip.
In addition to the damp weather (high 90s % humidity all the time) the ventilation from the windy end of the run has been slightly reduced this year because I added a makeshift extension in a hurry. (Avian flu cases were increasing rapidly and poultry would need to be brought inside.) The 'windows' in the extension are chicken-level and square, and face the prevailing wind that brings the rain, so they need to be closed against wind and rain; otherwise there are muddy patches inside the run, from the rain blowing in.