Re: Not exactly uncommon
Same here - wasps under the bathroom floor. I spent a while wondering why we kept finding a few wasps in the bathroom every day, then eventually spotted there was some mortar missing behind the soil pipe outside and the stripy buggers were flying in and out through the hole. A quick call to the pest exterminator and some new mortar solved the problem. A few years later we had a lot of building work done, including taking up the bathroom floor, and the nest they'd converted parts of the joists into was an amazing creation.