Next we replaced them with new joists (crowns up) and used a backpack battery sprayer to soak all surfaces of the Pressure Treated substructure (new and old joists) with a product called Deep Wood Fungus Killer which we sell and apply that penetrates deeply into the wood, killing bacteria and fungus as it soaks in.  This is an essential step because the remaining floor joists contain fungus that will continue to rot the Pressure Treated wood unless it is destroyed. 

Next we used the same sprayer to soak all the surfaces of the new and old framing with StoneWood… a product we sell and install that soaks into the first few layers of wood to provide a “once and done” internal wood sealer that will never oxidize, peel or burn off due to UV rays. It is a crystalline material that prevents fungus from penetrating the wood similar to how mold cannot penetrate the glass on a window. It never needs to be reapplied. Once and done.