Originally Posted by Trixella
I stuck a box fan in there and it seems to already be dry in less than 24 hours. I hope I used it correctly, I ended up painting it down with a paint brush and only used about 60 to 70% of the gallon I made up for 150 square feet. I don't understand how its going to help the underside of the plywood from rotting since it is only a topical application.
Well getting the bottom would be ideal but rot usually comes from interior leaks or along the lower exterior trim (where the edges of the plywood are).
The solution soaks in much the same as any water leaking onto the floor would. That is why it is important to get it to run to the edges of the plywood. Sawn end grain (every other ply) soaks water like a sponge.
Get plenty of solution along the edges with a small brush or something like a turkey baster. You could even stuff rags or paper towels in the gaps to hold some solution so it has time to soak in the edges.
When the borate solution soaks in the end grain, it leaves borate crystals there. If you get a leak in the future, the edges will still absorb water, but the mold/rot will not grow.