Wasp Infestation

For the past two summers, we have noticed wasps going in and out of small holes in the mortar between the bricks at the front of our house. Last year, we sprayed several wasp control products into the holes. This past winter, we tried blocking the entry point with steel wool but this week, we have noticed wasps again going into the mortar in different spots. We want to get rid of them. Will the nest die off if we block entry and exit points with steel wool now or will that cause them to come through an interior wall? Is it a good idea to get pest control in to spray into the tiny holes or will they die off naturally over the winter.? Any advice is appreciated. Milton

Wasp Infestation: I would really like to see images of these wasps before going into any detail. The only situation I would find worrisome would be if they were yellow jackets, as then there would be the possibility of them gaining entry to voids behind the brick facing and constructing a large nest there. In the meantime, you could use a hand-held dust applicator to squirt an insecticide into the holes, Click Here for some examples.