Re: dixie hustler "deck job" (turned full rebuild)
What is this false deck method you mentioned?
The false deck method of pouring foam requires turning a 4x8 sheet of plywood into swiss cheese, a cheap $12 sheet of 1/2" OSB will work fine for this:
When you're ready to pour foam lay the sheet of OSB in the boat and mark the centers of your stringer spaces on each end, use a chalk line to chalk these lines in. Then lay out your pour holes on 16" centers with the first hole 8" for the end and then 16" between each hole:
Cut 1-1/2" or 2" pour holes with a hole saw at each mark. Fasten the the sheet of OSB to the stringers with screws or weight it down heavily with concrete blocks. Expanding foam is very strong in a confined space and will lift the sheet of OSB up if not fastened or weighted securely.
Start pouring your foam one stringer space at a time and from the stern to the bow. When all stringer spaces are poured remove the OSB and cut off the foam titties and any excess flush with the flat foam. Take the excess/waste foam and put it in an unpoured stringer space and Lay the OSB over it and pour again.
When you have an 8' long section poured at the stern from port to starboard move the sheet forward and trim as need to conform to the shape of the hull and start pouring again. Flip the sheet over if you need to pour any unfilled stringer spaces.
You may end up with voids or "craters" in your foam with this method... kinda like this:
These will need to be filled with more foam and then cut off flush with the flat foam with a carpenters hand saw... but with the pour holes on 16" centers these should be minimal, if you get any at all.