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Every Winter we get at least one unwelcome house guest in the loft. This year is no exception.? The night before last, the little bu99er climbed on top of my DIY seesaw bottle trap locking it down with him on the outside. Look how he frantically wants to get inside to munch the peanut in there! How ironic. vi_2743_20220105_013504 (1)_Trim.mp4 So yesterday I made an arch out of a cardboard box to stop him climbing on top. At 3AM he got the bottle half way down by gingerly leaning into the opening, but it wasn't until later that he lost all will power and got completely inside. BINGO! Next stop, the back of Sainsbury's car park two miles away ? In the past we've released them closer to home (across a busy road) but on more than one occasion the same mouse has got back in the loft the following day so now we take them for a longer ride. Pure coincidence there's a nearby Owl sanctuary between us and the supermarket.? Ahem. At least we give 'em a sporting chance. But enough of that. I want some ideas how to stop? getting in. I think I know where as there's a very obvious entry point into the soffit box. This seems inevitable because it's where the eaves meets a perpendicular roof at a valley something like this: The cross section sketch shows the mouse entrance at the gap between the timber fascia and adjacent roof. The gap is necessary as water cascades down the GRP valley and down to the lower gutter. Looking at this junction from the inside of the loft I can see daylight here. The obvious solution is to spray foam the gap from inside the soffit box but this will bridge the fascia to the valley gutter and rot it out. The eaves have plastic vent trays all the way along the bottom of the first row of slates but stop at the gap no doubt for the same reason. Seems like a stupid design.