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Old 06-23-2017, 10:49 AM   #21
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I glued 3/8" plywood over 1/2" r-max. It bit me later on when I was gluing down cork flooring. Every seem was inconsistent. I think there is enough moisture that thin plywood will warp. If I could do it again, I would use t&g.
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Old 06-23-2017, 10:58 AM   #22
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I glued 3/8" plywood over 1/2" r-max. It bit me later on when I was gluing down cork flooring. Every seem was inconsistent. I think there is enough moisture that thin plywood will warp. If I could do it again, I would use t&g.
I'm doing a roof raise so I don't need a thin floor. My "plan" such that it is, is to spray foam the floor to an inch or so. 2 or 2 1/2 inch foam board and route it out for pex radiant heat. 3/4" ply on top of that. Then something on top of that. I like the idea of real wood flooring but that's another 1/2" ~ 3/4". Don't care about the height but will the radiant work with 1 1/2" wood to go thru? If I do real wood, I can probably skip the ply altogether?
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Old 06-23-2017, 11:44 AM   #23
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Bob, I still don't understand why you want to spray foam the floor. They make perfectly nice sheets of rigid insulation for that and it's so much cheaper.

My understanding was the only reason spray foam was worth the expense was because it would conform to the curves of the roof better than rigid insulation. Your floor is flatter than a pancake so why endure the expense of spray foam on a flat surface? You're essentially making your own rigid insulation from spray foam, but without the mylar.

After watching some of the vids about rigid insulation installations I've come to some new realizations about insulation. Next bus I will use rigid insulation in all the flat application areas, such as floors and walls. I'd still prefer spray insulation for the ceiling or other areas that are too difficult for rigid insulation. Even a small spray foam kit would do a decently thick coverage job if you only have to do the ceiling with it.

I'm not trying to argue with you. I just don't understand why you'd use expensive spray foam to, in effect, create rigid flat insulation.
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Old 06-23-2017, 12:58 PM   #24
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Bob, I still don't understand why you want to spray foam the floor. They make perfectly nice sheets of rigid insulation for that and it's so much cheaper.

My understanding was the only reason spray foam was worth the expense was because it would conform to the curves of the roof better than rigid insulation. Your floor is flatter than a pancake so why endure the expense of spray foam on a flat surface? You're essentially making your own rigid insulation from spray foam, but without the mylar.

After watching some of the vids about rigid insulation installations I've come to some new realizations about insulation. Next bus I will use rigid insulation in all the flat application areas, such as floors and walls. I'd still prefer spray insulation for the ceiling or other areas that are too difficult for rigid insulation. Even a small spray foam kit would do a decently thick coverage job if you only have to do the ceiling with it.

I'm not trying to argue with you. I just don't understand why you'd use expensive spray foam to, in effect, create rigid flat insulation.
1) My floor is wavy and not even close to flat. That said it's probably flat "enough".
2) The biggest reason to spray foam the floor is to seal it. I want that sucker waterproof not mist proof. With all of the nail holes and bolt holes, I've yet to hear of a better way of sealing the floor 100%. Epoxy and pennies will miss the nail holes. Chalking will miss the nail holes. I have a couple of little rust spots that I didn't bother patching that aren't terribly big but are funny shapes. I may skip the foam board on top of spray foam and do just spray to 2" inches. The point of the foam board is to route it out for radiant heat.

I've lost where the thread is now but there was mention of a guy in IL that'll spray a bus for $800. Don't know how thick or the density of the foam but IL while not across the street is closer than OR. Guess I need to see how close I can get and be under $1000 or so.
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Old 06-23-2017, 01:19 PM   #25
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I'm certainly not an expert on floors by any means. I've exposed my many mistakes.

You're basically talking about putting a $600 kit worth of insulation on your floor to be followed by rigid meant to hold your hydronic system? Two inch rigid would do the same thing in the neighborhood of $200, and without the leveling problems. No trimming.

I'm just going to have to be patient and learn something from your process. Unconventional thinking is what's making your build so interesting to follow. This story is unfolding so slowly, I just wish you'd hurry the heck up.

I'm learning stuff for my next bus.
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Old 06-23-2017, 01:37 PM   #26
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I'm certainly not an expert on floors by any means. I've exposed my many mistakes.

You're basically talking about putting a $600 kit worth of insulation on your floor to be followed by rigid meant to hold your hydronic system? Two inch rigid would do the same thing in the neighborhood of $200, and without the leveling problems. No trimming.

I'm just going to have to be patient and learn something from your process. Unconventional thinking is what's making your build so interesting to follow. This story is unfolding so slowly, I just wish you'd hurry the heck up.

I'm learning stuff for my next bus.
Have you seen the video guy in NV that sprayed his floor? I don't know if he's on Skoolie or not. I'll wait until you answer before digging for the link. I have it semi handy so it isn't that big of a deal if you want it.

I'm not sure what he did between the spray and the plywood. He might have air gaps and just doesn't care. He doesn't have board nor radiant tho.
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Old 06-23-2017, 01:39 PM   #27
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P.S. You're one to talk about hurrying up with that six month paint job you've got going on.
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Old 06-23-2017, 02:01 PM   #28
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How true. And now I'm back in the middle of a heat wave again.

It's odd at this age. I don't have much tolerance for heat or cold, and the east coast humidity is out of the question.

Lucky for me I'm not on a schedule. I am, however, getting more work done now than I was during the winter. It's supposed to be triple digit temperatures for about a week, which is unusual for this time of year. I'm thinking of going to higher elevations for a while.
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Old 06-23-2017, 02:15 PM   #29
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why is it that everyone is getting awesome heat waves but us??? grrrr.. the hottest I can seem to get here is an occasional day thats 90 with 80% humidity... I miss the days when we had real summers...

even "rigid" insulation is going to conform to imperfections in the floors.. so "rolls" or "heaves" are goingto end up close to flat.. everything in a bus is like building on an old house.. you have to measure and cut to fir as you go... in theory it sounds awesome to be able to have perfectly square floors and corners so you can build cool cabinets in a shop and lift them into the bus.. but thats tough.. your best bet is to build nice square stuff but have variable wifth trim pieces to cover the gaps when you set things into the interior.. or be willing to cut and fit every single board you make.. ehich is super tedious if you are impatient..

the first time you move your bus 50 feet its going to be tweaked a different direction... vehicles are designed to flex to some extent... they arent completely rigid.. so trying to have a 100% square true floor is futile...

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Old 06-23-2017, 02:32 PM   #30
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It's odd at this age. I don't have much tolerance for heat or cold, and the east coast humidity is out of the question.
You're preaching to the choir. Preach on Brother!!*

*But do realize I've lived almost all of my life on the east coast if we are going to swap war stories.

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It's supposed to be triple digit temperatures for about a week, which is unusual for this time of year.
That happens where you are?!!? For a record single day temp fine and dandy but a week straight? If it's a common (yearly) occurrence, screw that!!

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I'm thinking of going to higher elevations for a while.
That's generally a good idea regardless of temp. Now if the snow fall is being measured by the foot per hour then I might reconsider for the day/week.
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