For most pre-treatments, you will do a 5:1 ratio. You will use 1 gallon of Bora-Care to 5 gallons of hot water.
For framed wood surfaces above ground, apply a 1:1 solution. Treat remainder of structural wood in a 5:1 solution. Concentrate application in areas susceptible to attack, to include all sills, plates, floor joists, piers, girders and subfloors. Treat all exterior wood including siding, facias, soffits, eaves, roofing, porches, decks and railing. If Bora-Care is the sole preventative treatment for subterranean termites, a 1:1 solution must be used.
Buildings on crawl spaces and basements (preventative and pretreatment) – Use a 1:1 solution and apply in a 2 foot uninterrupted band to all structural wood surfaces in crawl spaces and basements. To prevent termite shelter tubes on crawlspace walls, apply to concrete or block walls in a 2 foot band up from the ground on interior wall surfaces. Apply at the rate of one gallon to 400 square feet of surface area.
Boracare takes care of any active infestation of wood-destroying insects such as termites, carpenter ants, powderpost beetles, etc. It is possible for the wood to become infested again if it has been exposed to water, if the wood wasn't treated in any way, like if it wasn't stained, after the Boracare treatment dried or if not all exposed sides were treated.
Although, from the information you provided regarding the termite tunnels, if you're talking about mud tunnels then you are dealing with Subterranean termites. Boracare will still affect them if the eat the wood but the method of treatment to get rid of the colony will be to do a trench treatment around the Perimeter of your home with Termidor. Termidor can't be used indoors unless it's sprayed/foamed inside an enclosed wall void.
If you are sure, however, that you are dealing with Drywood termites, we recommend that you call Nisus (800) 264-0870 to troubleshoot with them as they are the makers of Boracare.
When using Boracare to treat for an active infestation of wood fungus it is applied at a 1:1 ratio for wood that is 4" thick or greater. Use a 3:1 dilution ratio for wood less than 4" in thickness. You can spot treat the areas that have active fungus and then use the 5:1 for future prevention in the non effected areas. You should be sure to address the moisture issue in the area before or during treatment of Boracare and apply a vapor barrier after the product has dried. Please see the product label for complete application instructions.
You should drill whatever size hole you need based on what you have available to inject the Bora-care with. Typically if you have an injection piece of equipment, 1/4 inch or 1/8 inch holes are used. Please see this technical bulletin from the manufacturers of Bora-Care that explains about drilling and injecting into wood. See page 5 and it will give specifics about the drill pattern, etc.
Yes, you can apply Bora-Care to pressure treated wood as long as there is not any kind of paint, stain, or water sealant already on the wood. Be sure you apply Boracare at a 1:1 diluation ratio with water for active insect infestations. You should then apply a water sealant to the wood after the Boracare has dried for best results.
Bora-Care is a very safe product and it is considered a green product as well. Typically, it takes about an hour for the surface of the wood to dry. After the application has dried completely, it should be perfectly fine for children and pets to re-enter the house. Bora-Care is a wood treatment product only and should have no effect on concrete. If you are looking for peace-of-mind and protection when applying professional pest control products, then the Basic Safety Kit is for you