With the unreliability of current detection methods, there is always some doubt as to the extent of drywood termite colony boundaries within homes. Consequently one can never be sure that all infestations have been treated when applying spot treatments. Major issues to consider with the use of fumigants include the difficulty of installing tarpaulins, the difficulty in determining the proper dosage, the need to protectively bag food items, and the lack of residual control. Residual control means long-term protection from drywood termite attack, often for several years or more. Vacating structures 1 to 2 days for treatment and ventilation, and the possible damage to roofs caused by dragging tarpaulins or walking are additional considerations with fumigant use.
Heat is a nonchemical option for whole-structure treatments.
An additional advantage is that portions of large structures can be treated separately, which is very useful in apartments and condominiums. The major drawback to using heat is heat sinks, which are areas within the structure that are difficult to heat, such as wood on concrete. Other issues to consider include the possible damage to sensitive items in homes, and like fumigants, heat treatments have no residual control. As more powerful and efficient heaters are developed, larger homes can be efficiently treated with heat. For the liquid and dust insecticides to be effective, they must be touched or ingested by termites.