May 26, 2015 - 09:52 AM
Indoors, use Termidor foam and foam the plumbing void where the water lines are located. Do this by using making a small hole aboutu 6 inches off the floor and in between all wall studs where water lines and drains are located. Make a 20-30 second injection of Termidor foam for each wall void.
The bath tub probably has a trap or cut-out under it. This trap is basically a 1 foot square section of dirt where the drain goes through the foundation. Cut an access behind or beside the tub about 6" x 6" through the sheetrock. Get a good flashlight and look under the tub and inspect the trap for termite shelter tubes that are emerging through it. If you see any, use a screwdriver or something and knock them down. Then apply about 2 gallons of Termidor mix into the trap thoroughly saturating it. If the A/C plenum draws air from the bathtub area, don't use Termidor, Use Altriset.
When finished, replace the sheetrock in the wall, use a small amount of ducttape to hold the sheetrock in place, and then install an A/C Vent cover over the hole to cover it. This gives future access and also makes the hole look nice, like an A/C Vent. You can get a nice looking cover at any hardware store.
If you have more questions, let me know.