Mixing Bora-care - how do I know how much to use?
Your area calculation makes it seem like you are treating a single 8' long 1x6 board.
Anyhoo, the amount you need depends on the porosity of the wood. The instructions say to apply &quot;to the point of saturation&quot;. If your area calculations are correct, than you probably need less than 1 gal. of solution. So, at an approximate 5:1, you need about 105 oz. of water and 21 oz. of concentrate to make a tad bit less than a gal. of solution at 5:1.
P.S.- math is not my forte
P.S.S.- I don't think you need perfect accuracy here...