Q. My brick building was built in 1922, and the hall downstairs is infested with rats. These are not mice. They are constantly coming in. We’re hiring someone to inspect the foundation walls to check for holes. The foundation is about 5 feet into the ground. The building is surrounded by concrete sidewalks and alleyway. We also have a hall with hardwood flooring that is spongy in some places. Someone thinks the floor could be supported with wood sleepers on dirt; would that be an entrance for more rodents? How can the rodents be kept out? Many exterminators were no help.
DENNIS, SOUTH BOSTON