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Old 06-26-2017, 10:36 PM   #1
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Join Date: Jun 2017
Posts: 7
Insulating floor from underneath?

Once again, feel free to direct me if you think this has been well covered somewhere-i have very limited access to internet so i can't spend hours searching threads first, but it seems like most people are insulating the floor above the metal and then adding another layer of plywood or something. I was wondering about spraying something in between the I-beams below the existing floor so as to maintain more height. Bad idea? is this going to trap moisture against the frame or something? Maybe i'll have to make some heat-shields for the muffler/pipes? Surely somebody must have tried this.

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Old 06-27-2017, 01:47 PM   #2
Join Date: Nov 2015
Location: Midwest
Posts: 2,573
Year: 2003
Coachwork: BlueBird
Chassis: TC2000
Engine: 5.9L Cummins
Rated Cap: '00
Yes, has been done. Mine has sprayfoam underfloor from factory- is a Bookmobile. It is very nice and cozy. Protects underside from corrosion.

Consensus is that is possible, but difficult with hoses and wires under there. Fuel tank would need dropping.

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