The only place that I can keep my layout is the garage. It is normally bone dry in the garage, in fact my biggest concern was dust, the garage being brick built with a concrete slab roof. This morning when I checked it I found water had penetrated the garage and dripped onto the layout, which was stored at least 2 feet away from the nearest wall which is shared with the adjoining garage. There was no sign of an entry point for the water and there was no evidence on the ceiling of the garage of water entry and the water was nowhere near the walls. I checked the roofs of the garages, mine was dry but the adjoining garages had standing water on them so I assume that was the source. Fortunately the water only fell on the underside of the layout and the extreme end and not too near any electrics, only a buffer stop and some plastic buildings were made damp.