Very difficult to ventilate more.....the outer logs are getting sunlight which mould spores don't like. I don't think you can do much about it apart from shifting the logs round a bit which is a bore.
Are the mouldy logs below 15% moisture?
John
In my experience the wind normally goes the 'right' way but the roof is a new addition. I'd heard that the odd shower doesn't impact on the logs drying out but obviously if they're soaked when you want to light them that's not great
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