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Old 12-06-2017, 02:05 AM   #1
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1970 25' Caravanner
Incline Village , Nevada
Join Date: Jul 2012
Posts: 116
Rigid foam board insulation in belly..XPS or EPS?

Have read through a lot of threads about what, if any, insulation to use under floor.

Seems to be many ideas on this but am curious about choice of closed cell rigid foam board. Do you go with the extruded polystyrene (XPS) or expanded polystyrene (EPS)? Have watched videos and read testimonials on both but they are made by the suppliers and the bias is obvious with each pointing out flaws and false claims of the other.

For 2" thickness 4'x8' sheets :
The orange store carries Foamular (XPS). rated R-10 for $32.95
The blue store carries R-tech (EPS). rated R-7.7 for $21.99

What are other pros/cons of each? Would love to hear from anyone who has installed either as to their experience over time. Or anyone who uses either routinely.
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Old 12-06-2017, 10:39 AM   #2
GAT
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1976 31' Sovereign
Ball Ground , Georgia
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What I'm doing

I can't help you because I did not do any research. However I am heading out to the shop now to start installing two inch pink form boards that came from the Orange store. I usually purchase from the blue store but they only had one inch in stock so that was the deciding factor. Mine cost $36.00 per sheet so it seems you got a better deal. I'm redoing a 1969 31 foot sovereign and bought a case of liquid nails and a box of 21/2 screws to hold it in place. Not sure if this is the best method but after pulling a nasty belly pan and awful fiber glass on my back my patience is less then when I started so I hope this will work out.
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Old 12-07-2017, 01:51 AM   #3
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1970 25' Caravanner
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Personally (having no expert knowledge) I like the pink stuff better. But I have access to the R-Tech for less than $10 per sheet. Thinking the lower R value is worth the savings but want to make sure it's not a far inferior product in other ways.
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