I won't know how effective bora-care is on preventing termite & fungus damage for 20 years . But this is my experiences mixing it with water.
I used a 1 to 1 mix because the existing untreated douglas fur 2x8 joists joists under my trex composite decking suffered random termite and dry rot damage. There is no roof over this deck and the surfer I hired to install it provided no spacing between the trex planks and used 16 sinkers instead of stainless screws and 1/3 of his sinkers missed the joists.
After 20 years most of the sinkers were rusted away.
This location is on the central cal coast about 100' above and 400' from the sea. Pretty corrosive environment.
Actually the most damaged components were the 2x12 clear redwood fascia surrounding the deck. It looked like a honeycomb from the termites .
I painted the new, replacement, already pressure treated (copper solution) 2x8 fur joists with a 1 to 1 bora care solution.
I used the same on the new, non pressure treated redwood 2x12 and also on the top surround 2x6 railing.
Since I was painting each joist on 4 sides twice with the solution I mixed small batches ( 1 quart) of the very thick (like STP) bora-care with water from our water heater at 160+ degree F hot water.
I incorporated the hot water into the BC slowly mixing with a painting stir stick which worked well for starters and finished with a rotating metal paint stir tool driven by my electric drill motor.
I experimented with the water temp and found the hotter the better.
I'm 80 so, don't check back with me in 20 years.
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