This year I'm finally going to get round to flooring out part of the loft. However, when I started cogitating on this particular activity back in the summer, I noticed that the loft was home to thousands of cluster flies. As it wasn't a pressing problem, I pretty much just shut the hatch and left it for another day! So, if I'm going to start thinking about using the loft, I'm going to need a way to stop the flies getting back in, once I've got any that are left in there out. I was thinking that I could effectively seal the usable space by creating a 'box' in the loft. Then the flies can do what they like outside the box. I wouldn't see them, they wouldn't see me, and we could all co-exist happily enough. Is that a good or bad idea?