Spray foam vs sheets
- Thread starter java
- Start date
pappawheely
Autonomous4X4
Subscribed. I like the spray foam for the same reasons but can't seem to find anything that is cost effective.
java
Expedition Leader
You can get DIY kits. Its messy but I have used them on remodel projects. This one is 1200 board feet, $1500 plus shipping. https://sprayfoamkit.com/products/spray-foam-insulation/kit-eeh/
Coachgeo
Explorer
Did some reading on these bulk spray foams like that in previous post. Not the can stuff. R factor is higher than can stuff. BUTT Think there is a fire retardancy issue. If recall right to meet reasonable fire safety they must have an air space before interior wall AND be covered with and at least 1/2 drywall or similar fire retardant panels. Don't quote me though...... read all the info closely.
java
Expedition Leader
Ever the possibility, but sheets will have the same issue, foam is inherently flammable.
Thats true, I didn't think much of the additional rigidity. I will likely use conduit or surface mount the electrical, just for ease of repair.
https://www.homedepot.ca/en/home/p.system-200-2-component-spray-foam-kit.1000718744.html
Thats a Canadian site but I imagine you could get it in the USA, great stuff for small projects. Spray foam will definitely "tighten up" the structure/skin, and insulate better.
Thats a Canadian site but I imagine you could get it in the USA, great stuff for small projects. Spray foam will definitely "tighten up" the structure/skin, and insulate better.
rruff
Explorer
Spray foam is best if you need to go around pipes and wires and things. On the exterior skin I see no advantage to it. You don't need to leave gaps with sheet, and if there are, get some rattle can foam and spray the cracks.
After you apply foam you need another skin. What will that be? Also the foam won't be structural, so how will you structurally attach the outer skin? Seems like you'd want the aluminum on the outside. Or am I misunderstanding you, and the foam will be on the inside?
I have done extensive reading on spray foam vs foam board or other insulation. As others have said, spray foam is far superior to other insulation. The only drawback if you either DIY or have someone professionally do it, is it needs to be done in thin 1/2" (expanded) coats to prevent distortion of the body panels. Pillars and less accessible areas can be filled with the can foam...
Betarocker
Adventurer
Instead of having the sprayfoamer come to you, go to him. Find out where they are doing a house and drive over and get him to do the application. Tape off everything you want to protect.
rruff
Explorer
Far superior in what sense?
Coachgeo
Explorer
Was thinking the same myself cept was actually thinking the cab since I want to use the behind the seat area for a bunk ... that and the AC system won't have to be as big either. Won't be the first time someone has driven somewhere with a milk crate for a seat. Just don't know what to use as a cover over the foam that has some fire retardency yet can mold around the curves of the body where needed. (FMTV/LMTV)
I know this was not addressed to me but since I feel the same way, I'll mention a few.
It will add strength to the body panels and further reduce noise.
Spray foam will cover and seal all corners. voids and cracks.
It adheres directly to the body panels and pillars and can be sprayed to the depth of the pillars whether that's one inch thick or 4" and once dry, excess that expanded beyond can be cut off. This will give you maximum R value and practically eliminate condensation.
Sheet foam is flat and fairly rigid. Body panels are usually slightly curved and have additional cross bracing and other aesthetic bends. There no doubt will be an air gap between the body panel/skin and the foam sheet. Unless a sheet is perfectly sealed by can foam on all sides, the air in that gap (between foam and skin) will either heat up and rise and be replaced by cooler air at floor level or cool off and sink being replaced by warmer air from the ceiling area. This is called convection and can be a awesome principle to passively heat a home...
Joe917
Explorer
Spray foam will fill every crevice and bond to whatever it is prayed on adding structural strength. Cutting rigid foam will leave gaps.
Cover the foam with thin plywood.
Spray foam Promaster... Just came across this in my saved bookmarks... http://www.buildagreenrv.com/our-conversion/our-conversion-insulation/#comment-12023
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