I have a deck that is build directly on the ground outside my house. Every year I have wasps that must make nests under the boards. They fly in and out of the board gaps. It doesn't bother me much but now with two young kids they don't want to play on the deck. I tried spraying the cracks with wasp killer chemicals but it only kills a few wasps and then they're back. I can't access under the boards. Is there a product or something I can do to kill the wasps or prevent them from entering under the boards. I guess I could cover the deck with some kind of outdoor carpet. Has anyone tried this?