Wall/door jamb/toe kick repair: Ant invasion
Our house was a slap-dash builder's special. There is a quarter-round strip of molding in front of the floor toe kick. When I saw it I told my folks that it was a sure-fire indication that it is hiding something, probably that the floor isn't properly flush against the wall. Sure enough a mysterious water stain appeared on the kitchen ceiling, and when Dad went into the bathroom upstairs and removed the oak strip, he discovered that there was a quarter-inch gap between the floor and wall.
ANYWAY, there is a similar gap, perhaps 2 cm, where the floor, toe kick, and back door jamb meet up, and is the entrance point for a colony of ants. The backdoor opens up onto a deck that is several feet off the ground.
So what do you recommend? I could spray the area outside on the deck (I can't get to the ground below), or I could caulk over the opening, or remove the oak strip and somehow....well, I don't know what to do. Can you help?