down in Yuma AZ and I'm having a difficult time finding the suggested XPS in any size other than 1" i do see R MAX thermasheath -3 which is a foil covered 2" ridged foam for $34 at HD. Question 1. Is PMF an option on the R-max? or I if i was to use that I would have to go with Plywood skin(0.19" burch $15 a sheet) and R-Max core? Making a 4'*8' Wall about $65 plus coatings. I'm assuming that you can glue two of the 1" XPS (about $15 each) use the wall paper removal tool and tightbond II and "Go to town"... I would welcome any advice.. Still way early in planing/dreaming..I don't even know what my wife's needs are at this time..I just know that she wants to travel.. I was an over the road driver (48 states) and know a TD Foamie would meet my needs, but she may require more than than.. figure I would start he off tent camping and then "Have the Talk".
Question 2. How far would I have to go to find XPS in 2"? Is there a better time of year to find it? or am I looking at shopping in higher elevations (Flagstaff= 7hr= camping trip with trailer to have room to bring foam home..lol)