You should wear chemical resistant gloves, long sleeve shirt, long pants and close toed shoes when applying Termidor. If you are applying the product in a non-ventilated area, a respirator is will be needed. Termidor is a safe product for most folks to use. We do encourage our customers to read the product label and the MSDS before they purchase a product to be sure they will be comfortable using it.
While you can use Termidor SC to treat voids in your subfloor, we would recommend to use Boracare instead because it can be applied to raw wood, be absorbed and last the lifetime of the wood. You can use Termidor SC in your crawl space if there's soil, you can trench around the piers to protect your home.
To treat subterranean termites we always recommend to trench where you can and also treat the crawlspace. Termidor SC can be used in crawlspaces. There are complete instructions on the Termidor SC product label (page 5) on how to use the product in the crawlspace, so if a bit inadvertently goes into the crawlspace it should not pose a problem.
We recommend doing a complete Termite Barrier Treatment if you are seeing signs of termite activity. Using Termidor SC will give you a 10 year barrier treatment against subterreanean termites. Termidor SC is applied in a trench and in drilled holes directly around all sides of the structure. It will take approx. 90 days to kill any active colonies depending on their size. You can apply Termidor Foam in the wall voids in the sheet rock to spot treat activity. Where there is concrete you will need to drill directly into the slab. This includes patios and garages. Please read the article below for more information on treating termites.
To treat a concrete slab, you will come 2-3 inches off the wall and drill holes 10-12 inches apart using an 18in-24in drill bit. Using a 5 gallon bucket, mix 4 gallons of mixed solution (.8 fl oz of Termidor SC per gallon of water) and pour the 4 gallons of mixed solution in the drilled holes for 10 linear feet. Usually each hole will take approx 1/2 gallon of solution. It is easier to use a funnel to pour the solution into the holes. If there is a crawl space at any point, dig a 6x6 inch deep trench around any post or cinder blocks in the crawlspace and pour the Termidor SC mixture into that soil.