There is a way to seal your floor you know. The smell will not come through the wood as far as I know.
I understand not wanting to cutout the floor and it is your bus and your project and it maybe a lot of work that you were not planning on doing and i am by no means telling you what to do.
I do highly recommend cutting a hole or pulling up the center ramp at the front and have a look in that cavity before you decide. Yours may not be that bad so you may be ok. Definately worth a check,
you may also want to figure out a way to use that space. Maybe a flip up hatch for storage, tank, or with the inverter in it for access, will still have air for cooling but be out of the way and not in the bay. a lot of wasted space there. space becomes more of a premium as you fill your bus up
. This area is mostly at the front, maybe you don't need to pull all the floor up just some spots., the bays and engine area you can see the bottom so your call.
If you use an RV dinette that makes a bed and the table mounts to the wall, a hatch in the floor there would be good because you can lift the table out of the way to get to it. Just a thought.
at least cut out around the wheel wells and seal or cut small holes and fill with spray foam them up to seal them. If I drive in the rain, I sometimes end up with mushrooms growing up from the wet dirt
there a little while later. I don't think they cleaned the old floor when they put down the plywood
(could be from BS at the non-rally
) I haven't noticed a smell from there, at least not yet. I did peek under there one time and noticed the dirt, yukkey! If you are leaving the bus air you'll be treating it different. Sealing the plywood is a good idea too. Be sure to keep the engine hatches not only accesible but where you can get to them when there open too.
How bout some pics on your progress, you know we likes pics!!!
Do it your way!!!
NCBob, since you started this, what did you end up doing? hows the winterfest going?