A rumour/myth circulating in la Sweden is that installing solar panels will cause increased humidity in a ventilated loft, which in turn might result in mould growth.

The concept is mostly promoted by "humidity" companies that sell e.g. de-humidifiers. I've seen no references to evidence to back up the theory, and am interested in the opinions and experiences of the good folk on this forum :)

My roof is a typical two sides rising to a "point", with the insulation lying flat over the ceiling and ventilation via the eaves, and even a few holes at the higher places under the tiles.

I thought as much, there's a lot of air up there! We do get high RH in the late summer, but I struggle to imagine any wood would get sufficiently damp for mould to start growing.

<blockquote><cite>Posted By: Peter_in_Hungary</cite>unless there is insufficient ventilation - in which case buy a dehumidifier from a ' humidity' company and plug it in or increase the ventilation. You might want to take advice from the 'humidity' company sales rep - or not !!</blockquote>
The loft has had sufficient ventilation since built back in the 80s, i.e. no mould, so I'm assuming (hoping) the solar panels won't affect that?

(don't know why I can't quote with this browser Chromium )..

Posted By: Ed DaviesYou need to select Html in the “Format comment as” radio buttons below the “Enter your comments” box.

Thanks