Srpay in expanding insulation?

[Jb1rd]

I have been thinking a lot about the insulating factors when I start the remodel of my interior and how to best go about it. Has anyone here had direct experience with using a 2 part spray on expanding foam insulation (Injected Polyurethane Foam Insulation) like what they would use in a SIP's house or commercial application? What are the negatives? Is there a worry of rust? I know when doing a more traditional insulating job you would use some sort of vapor barrier would this still be necessary? Would it be beneficial to add some MLV to the larger open areas? I know this is a lot that I am asking but I would like to only do this once :sombrero:
PS I HAVE done a pretty thorough search and only found one YouTube video, maybe I am not searching correctly?

 

[Healeyjet]

Here is a couple photos of our camper interior right after spray foaming. I am looking forward to a nice warm camper. Ours is aluminum inside and out so no rust worries. I know of at least one other camper that was spray foamed but it too is aluminum. I know that with SIP's a vapour barrier is not necessary as the foam is the barrier at least in our building codes.
Ward

 

[boardrider247]

I think there were a couple threads on the sprinter source forum where guys had done it.

 

[martell06]

Johny5 had it done professionally. His opinion from this build thread: http://www.expeditionportal.com/for...y5-s-stealth-camper-van?p=1958062#post1958062

 

[ert01]

My van was spray foamed by the original owner in 02. No rust issues. In fact it has much less rust than most other comparable vans I see on the roads up here. I have some paint flaking off around the wheel wells but I don't account that to the spray foam... Im sure it's more due to my tendency to drive on gravel roads...

I'm in Alberta and we see +30C in summer and -40C in winter.

I think off-gassing is a concern with the DIY kits. A professional shop is supposed to be able to get a correct mixture ratio so that off gassing doesn't occur.

Im quite happy with it. Half the battle with insulation is the vapor barrier aspect of it... So you can keep the air changes controlled rather random than due to leaks. And spray foam acts as a VB and insulator all at the same time. It also keeps panels from rattling and vibrating and amplifying the road and wind noise.


If I were to do it myself from scratch, I'd probably use some dynamat (or similar) before spray foaming just to help cut noise even further.

 

[Martyn]

We insulated the cavities on a van using foam. The flat panels we insulated with styrofoam sheets. Worked out very well.

I initially looked at the two part kits but after looking at the volumes required and the difficulty getting a kit of the right size I decided upon cans of insulating foam. A few things to consider, make sure that the foam is closed cell so it doesn't absorb moisture. Allow for expansion and make sure the excess foam has a place to escape. If the vent or hole for expansion is too small the panel being filled will bulge.

 

[Bbasso]

My thread from a while back.
http://www.expeditionportal.com/forum/threads/120361-insulation-setup-who-thought-out-of-the-box