Hello all...have an old solid brick home. I pulled the paneling in a room to prep it for a nursery to find a 1/4 inch gab and termites coming up the furring strips. Odd thing is all the interior walls had pt sill plates but not the exterior. I stuck a tool down the crack and it went down about 6 inches and smelled lik dirt. My plan is to pull the bad wood, clean it up, pour boric acid and salt in the cracks, caulk with something(something for concrete cracks?) and put pt wood all around exterior sill sound good?