You can use Bora-Care but would need to seal the wood before putting it on the ground.
Per the manufacturer, Bora-Care can be used in conjunction with a tent treatment but it’s recommended to be applied afterwards. How long after the tent treatment, depends on the chemical the professional company uses, they should be able to tell you how long you have to wait.
Bora-Care can be used on raw, untreated wood surfaces indoors and is safe for kids and pets once dry.
Unless a dye was added to the Bora-Care at the time of application, you would not be able to tell if the wood in your crawlspace has been treated or not.
Ideally we would need to know specifically what pest you are treating for. Are you treating for powder post beetles? Or are you treating for drywood termites? In most cases if a wood destroying insect is found within the frame of a piece of furniture your options are as follows: Option 1- Strip down any stain or finish on the wood down to its raw natural state and apply a product like Boracare to the raw wood surface to treat it and then you can refinish as desired once dry; Option 2- If stripping the finish off isnt an option then you would need to drill holes in the needed places of the furniture and insert a product like Jecta which is an injectable form of Boracare. Both the Boracare and Jecta absorb into the wood so that as the insects inside it eat the treated wood they consume it and die from it. Both products also last for the life of the wood to protect it; Option 3- If neither of those are an option for you and you dont want to drill holes or remove the finish, then your only option would be to hire a company that has a heat treatment or fumigation treatment chamber to put the furniture within to kill all the insects within it without doing any damage to the couch.
Bora-Care would be the best product to use, applied twice to the three surfaces you can get to. It will penetrate up to 4 inches with 1 application, and up to 8 with 2. If you choose to drill 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.
No Bora-Care, like any other borate product, cannot be used on trees or plants. It is for cut lumber only. Borates will kill any living plant, shrub, grass or tree. Termites do not attack live, healthy trees. If you have termites in a tree you would need to treat the nest directly by drilling holes into the dead parts of the tree where the colony is infested. This can be done with something like Dominion 2L. Most people are primarily concerned with protecting the big investment, their home, and Dominion or or Termidor would be the best product to use for that. Termidor is the top product and can last 10 years in the soil, whereas Dominion will only last 5-7 years. It is only labeled to be used adjacent to the structure, though.
It is best to apply Bora-Care to wood that is free from dust or other debris.
Yes, allowing Boracare to freeze can make it ineffective. It should be stored in a controlled temperature area out of direct sunlight and extreme temperatures. You also want to avoid applying any product in below freezing temperatures because the water part of the mixture can sparate and freeze.
We would recommend contacting the manufacturer of Boracare directly to see if this application would be safe or harmful to the bees. You can reach Nisus directly at 800-264-0870.