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Doug Dickinson (Dougd470) (206.71.111.243)

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Posted on Saturday, July 20, 2002 - 6:32 pm:   

Of the many discussions here - I don't recall seing much about the insulation UNDER a coach. I am looking at an MC9 but the oncept applies to most any coach.

The inside I am looking at doing a hot expansion form for boath insulation and structural reasons (I hear it makes a good coach tight as a drum after application).

Under the coach, I do not want to raise the floor. Would foam work here? Should I look at an alternate? Is block foam better under the coach? Any ideas?

Thanks
Johnny (65.235.203.181)

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Posted on Saturday, July 20, 2002 - 7:10 pm:   

I asked the same thing--someone suggested sprayed foam (factory on a Prevost).

Now, I have to find someone that can do it.
George Myers (12.85.14.49)

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Posted on Saturday, July 20, 2002 - 9:27 pm:   

I put an inch of form sheets on the floor with OSB over it for the actual floor.
Mike T (206.170.3.14)

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Posted on Sunday, July 21, 2002 - 11:03 am:   

I just did the bottom of mine. I used the McMaster-Carr kit reviewed in a recent string by Gary Stadler. His review was very accurate. This is a great product and the spray is very easy to control. I did three coats, mostly because it's hard to spray in even sweeps working in a space that's a little over a foot. After each coat I trimmed high points with a regular handsaw (really easy). Then I filled in the low spots and repeat. It was just the thing. I can't stress enough that you need to cover anything that you don't want foamed, especially yourself. I was quite a sight that night. My clothes are hanging on the garage wall in memory of the occasion. Have fun.
johnwood (206.252.250.5)

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Posted on Sunday, July 21, 2002 - 3:45 pm:   

One option for the bays at least is to lay a sheet of blue foam on the floor of the bay and cover with plywood. This would allow for the insulation of the bays as well as the living area. (need to keep the poop from freezing too.)

Including the mass of the storage in the bays with the mass in the living areas should help to even out the temperature swings in the coach.
Bill K. (209.173.120.121)

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Posted on Sunday, July 21, 2002 - 8:27 pm:   

Is anyone spraying the underneath of the bus or
just the top of the bays.
Mike Heron (199.250.136.5)

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Posted on Monday, July 22, 2002 - 3:59 pm:   

I had my spray foam contractor shoot the underides of my entry stairs (MCI)becaise I am told that that area can radiate a bit of cold in winter, especially going down the road. Regarding insulating the floors, some others have said that such insulation (other than the floors and walls of the bays) is not as productive as laying in some of the Nu-Heat material, which will radiate up and keep your feet warm.
Mike T (206.170.3.215)

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Posted on Monday, July 22, 2002 - 11:23 pm:   

Bill K,
I did my underside. The bus had foam everywhere underneath originally. I did a lot of repair and alteration to the bottom of the luggage compartments so I wrecked a lot of the foam. My foaming was replacement of those areas. The old stuff seemed to hold up really well over the years. It is covered with the expected road dirt and tar but with very little erosion. I figure it adds a little more insulation for my holding tank compartment too. Mike T.
CoryDaneRTSIIIL (198.29.191.148)

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Posted on Tuesday, July 23, 2002 - 6:54 am:   

Mike, are you saying that the foam, ( I assume you are talking the foam sheets, 1/2 to 3/4 inch thick ) were laying on the bottom exposed to the bottom and covered with plywood???
I would think that if the exposed area was covered with something like Cool Seal, weatherproof roof coating, it would further protect the foam as well as insulate the bay.
Am I thinking the way you discribed your insulation? thx, cd

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