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TonyAndKaren - Thanks for sharing your experience, yes I see the bulging and that is something I definitely want to avoid. I have decided to add additional studs to the rear part of my vehicle, I think that will be safer whether I choose foam or polyiso boards. John - I'm trying to get a good...

Tonyandkaren, based on your description of your motorhome I would guess your walls are stronger than mine... My studs are 4 feet apart (for a 16 foot cargo area, there are only 3 studs between the driver seer and the rear door). In fact, the last stud doesn't even come to the ceiling. So when...

Yeah, definitely a huge difference in cost -- it's double the price of me installing polyiso. Surprisingly though, professional installation is about the same cost as buying the materials and spraying myself. I'm leaning towards saying yes, but I'm hesitant on saying yes because of breaking...

First, let me say thanks to everyone on these forums. I've been reading for weeks and the forums have been a huge help. A couple weeks ago I purchased a 16' 2004 MT35 Freightliner step van that I'm converting into my stealthy roaming house. I'm currently trying to decide between polyiso vs...