Hi. My sister is insulating her 3 bed semi attic. It's around 500 square feet. She has purchased 200 MM earthwool, cost 190. Tradesman doing some other work for her has agreed to install it. Should it be run between the joists but not covering the vents at the edge of the attic? She has no spotlights to worry about. What about the attic door ? Is there a way of insulating this also to ensure less heat loss. Sorry I know very little about this. She doesn't want to go the grant route as its more expensive. She has a mould problem on the ceiling of her ensuite so she thought adding extra attic insulation might help with the addition of an extractor fan. Is this true ?