Wood Replacement . Where the infestation is limited, remove and replace damaged wood, preferably with pressure-treated wood which will protect against both termites and wood decay. Or it may be more practical to have a pest control operator apply special formulations of a wood preservatives. They penetrate fairly deeply into unpainted wood surfaces, particularly cut ends and structural joints. Certain precautions are necessary to protect ceilings and painted surfaces from staining.
Fumigation also is the most effective method of drywood termite control.
First, a structure is completely enveloped in gas-proof tarpaulins or heavy plastic sheeting. Masonry construction with flat, composition shingle roofs may be sealed around the doors, windows and vents. Then a fumigant gas is released into the structure. The gas penetrates into cracks, crevices, void areas and directly into wood to kill termite colonies. Lethal concentrations are contained by the tarpaulins long enough to permit uniform penetration into all infested areas.