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Old 09-16-2014, 10:33 AM   #31
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Re: College student taking on 2000 Thomas Saf-t Liner

Make sure you fill all gaps! You don't need air leaks or heat transfer happening when you don't want it to!
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Old 09-16-2014, 10:34 AM   #32
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Re: College student taking on 2000 Thomas Saf-t Liner

Quote:
Originally Posted by Docsgsxr
Make sure you fill all gaps! You don't need air leaks or heat transfer happening when you don't want it to!
Thats the plan! Going to get some type of filler for the small cracks. The larger ones I will just get some of my plywood and cut it to smaller size
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Old 09-16-2014, 10:36 AM   #33
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Re: College student taking on 2000 Thomas Saf-t Liner

Just remember, the spray foam holds moisture! Don't need any rust accelerators trapped in there!
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Old 09-16-2014, 10:42 AM   #34
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Re: College student taking on 2000 Thomas Saf-t Liner

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Originally Posted by Docsgsxr
Just remember, the spray foam holds moisture! Don't need any rust accelerators trapped in there!
Thanks! Any good product suggestions?
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Old 09-16-2014, 12:14 PM   #35
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Re: College student taking on 2000 Thomas Saf-t Liner

Doc, I had heard that also so I tested Great Stuff for water absorption by placing a cured lump of it in a sealed jar full of water. I let the foam steep for two weeks and when I removed the cover on the bottle the foam jumped to the surface just as it had done when I first placed it in the water. The mfg says its foam is closed cell so I suppose the results I got are what I should have expected. IMO unless there is dirt or rust or something else to hold water between the spray foam and the metal, Great Stuff, at least, won't promote rust. One thing that will mess up spray foam is not allowing it foam to "grow". If it is confined it becomes a sticky mass of glop with no insulating properties at all and a real mess to clean up (personal experience) Jack
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Old 09-16-2014, 08:50 PM   #36
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Re: College student taking on 2000 Thomas Saf-t Liner

O.T., you are absolutely correct, the foam itself will not hold moisture, but if you butt it up against plywood, which will, plus the vibration of the vehicle, say after 15000 miles on midwestern interstate I am sure it will not be perfectly sealed. Plus the foam won't rust, but it will also not let the water evaporate once it is trapped between the foam and the steel.

Try that same test with a steel divot, with the foam on it with a small penetration so the moisture can get to the metal. You'll see what I meant.

Please don't think I'm "Nat'ting" here. Just hate once you get all that work into it, you wind up with a hole in it.

Only my .02, but there are others who have experiences with it too.

I have never used expanding foam with metal. Only plumbing, doors and window installs in a house.

-Doc
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Old 09-23-2014, 08:38 AM   #37
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Re: College student taking on 2000 Thomas Saf-t Liner

Got the rest of my flooring down! Need a lot more mortar though. Also managed to put the rest of the crossposts up. Going to try to finish mortar this weekend and start on insulation and putting real walls up. Would like to start framing things up in the near future. Paint needs to happen soon as well. Last picture is a picture of what it looks like on the driveway everytime I go to work on the bus!



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Old 09-23-2014, 09:12 AM   #38
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Re: College student taking on 2000 Thomas Saf-t Liner

BWAWAWAAA "nat'ting " I spit my coffee all over my keyboard.
Quote:
Originally Posted by Docsgsxr
O.T., you are absolutely correct, the foam itself will not hold moisture, but if you butt it up against plywood, which will, plus the vibration of the vehicle, say after 15000 miles on midwestern interstate I am sure it will not be perfectly sealed. Plus the foam won't rust, but it will also not let the water evaporate once it is trapped between the foam and the steel.

Try that same test with a steel divot, with the foam on it with a small penetration so the moisture can get to the metal. You'll see what I meant.

Please don't think I'm "Nat'ting" here. Just hate once you get all that work into it, you wind up with a hole in it.

Only my .02, but there are others who have experiences with it too.

I have never used expanding foam with metal. Only plumbing, doors and window installs in a house.

-Doc
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Old 09-23-2014, 11:05 AM   #39
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Re: College student taking on 2000 Thomas Saf-t Liner

Mortar ???
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Old 09-23-2014, 12:05 PM   #40
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Re: College student taking on 2000 Thomas Saf-t Liner

Good idea Tango and it will make the bus rock solid as well .
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