I had, and I think they are back, the little burrowing buggers...
My house abutts the alley way that is the only egress from my little area back here, and it runs along the entire side of my house... Well, the Gas Company came an replaced a bunch of piping and I foung out, through watching them that the entire street is nothing but SAND! For about 10 feet, its all sand with some ashpault covering, and those little buggers have all the moisture they want! Plus my house is made from street bricks, two layers side by side, all the way up to the roof.
I was putting in sockets in the basement at one time, and drilled into the brick. I drilled about a 1/4 inch before I hit mush! Not a good thing for me, but, the wife insists that she will NOT MOVE from this house, that we will both die in this house, (now that I am retired), and doesnt want to hear anything about it...sheesh!. So, the house was termited before I bought it, and I've seen thier actions, (dirt comeing through the brick and mortar along the walls), so, I put some Diazonon plus down some holes beside the house, (took the plugs out that the termite guy put in, and they poured out of there!). They were kept in check for a few years, but, I have to do it again, because I see some activity on the shelf in the basement, where "dirt" is comeing through the brick again... So, time for another shot...
Just my two cents worth...
Jesse