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Old 12-06-2017, 02:05 AM   #1
3 Rivet Member
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
Owner Spirit of "76"
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1976 31' Sovereign
Ball Ground , Georgia
Join Date: Aug 2010
Posts: 271
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.

A husband is the biggest baby you will have and take the most adult supervision.

Gene and Elaine Thomason
Ball Ground Ga.
1976 31 foot Sovereign
2011 GMC 2500HD Denali
6.6 Duramax Diesel
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Old 12-07-2017, 01:51 AM   #3
3 Rivet Member
1970 25' Caravanner
Incline Village , Nevada
Join Date: Jul 2012
Posts: 116
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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