Finally got to spend some time getting the floor down so I can install the vinyl and start building. It was more work than I thought getting all that old flooring out and cleaning the thing up.
I guess almost 20 years of dust will do that.
I made a video that has a lot of it.
I got the flooring all pulled out, used the old mat as a template to cut the 1/2 OSB for the floor sheeting. I put 1/2 in OSB strips in the low points of the floor and then reflectix in the high spots. I glued the strips down to the body and put a few screws in them, and then taped all the joints with foil tape and installed the sheeting with screws about every 6 inches into the strips.
I also got the FatMat installed on the roof panels to keep the noise and vibrations down after I pulled the headliner out.
I also have it all listed in my build thread, here in the forum.
Here is a list of all the parts I have used so far:
Reflectix BP24050 24-Inch-by-50-Foot
(This is probably enough for my whole van due to the windows on the sides. If you have a full size cargo van and want to do all the walls as a vapor barrier and insulation you will probably need 2 of them)
3M Foil Tape 3381 Silver, 1.88 in x 50 yd 2.7 mil http://amzn.to/2yAADLb
This works good to seal the edges of the Reflectix
Loctite Power Grab All Purpose Adhesive 9 Fluid Ounce Cartridge
I prefer this unless it is below 50 degrees or the surfaces are possibly damp if so I use:
Loctite Power Grab Ultimate Adhesive 9 Fluid Ounce Cartridge
Very similar to the one above but works well in colder conditions.
Loctite Polyseal 10 Oz White 2 In 1 Seal & Bond All Purpose Caulk
This is another great thing to have I use it for sealing gaps it skins over rather quickly
DAP 59184 QT Ready to Use Flexible Floor Leveler
Fills small gaps or inconsistencies in your subfloor, flexible so it won't crack with movement
3/4-Inch Modified Truss Lath Self Piercing Screw, 100-Pack
I used 2 packs between the strips and the sheeting on top of the slats.
FatMat Self-Adhesive Sound Deadener Bulk Pack w/ Install Kit
If you have a cargo van this is probably the amount you need I will have some left over