Mark from Knoxville, Tn writes
Specifically looking to treat between the Unfaced Polystyrene rigid board and the foundation.
We reached out to the manufacturer BASF for an official answer on this verbiage on the Termidor SC label. Here is what they stated. “Not using termiticides in voids with Rigid foam insulation” is EPA required language that dates back to times when soil termiticides contained organic solvents/adjuvants which helped them remain in solution long enough to be applied but also damaged rigid foam insulation (think DDT, Heptachlor, Chlordane, or Dursban times; e.g. Pre-Termidor products from the 1950’s through 1990’s). In 1996, the EPA mandated that the language be on all liquid termiticide labels moving forward (regardless of whether the product contained solvents or emulsifiers or not). Termidor products do not contain any caustic emulsifiers or solvents that would damage/ “eat up” the rigid foam board (as the 80WG, SC, HE lines are all water soluble).” This also applies to the generic equivalent on the market under the branding Taurus SC. If you are needing to foam into the foundation void area where there is foam rigid board, they recommend using the Termidor Foam Aerosol as this labeling does not have that verbiage and restriction on it for use.
Answer last updated on: 09/12/2019
