We have a house that was built in the 1930s. When the house was built, the floor joists for the first floor (which are accessible from the basement) were impregnated with creosote in order to prevent termites and other pests from destroying them. The problem is that the smell of creosote permeates the house. A contractor has recommended painting the floor joists with shellac-based stain/odor killer (Bulls Eye or equivalent) to block the smell. Has anyone else dealt with this problem, or have any other suggestions? Thanks.