Cruiser Insulation R values?

[fam5mel]

Still looking at the CR347. The factory brochure says
The roof, floor and walls have R value of R7. I figured
This must be a miss print but the dealer says that's
correct. If true I will look for another brand. That seems
Awful thin for the roof and floor. Does anyone know
If this is correct?

[mmorris]

Our 08 brochure says R14 in ceiling and floor.

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[Dayle1]

Those are probably honest numbers. Truth is most brands are very dishonest or deceptive in what they quote. If you find the fine print you will see statements like, "best case" or "calculated" R value. Everyone uses Reflectix foil insulation, designed to stop IR, they use it in the floor and underbelly even though almost zero infared rays will hit it there. Foil also has an "equivalent R value", it is not thermal insulation, only works for IR. The equivalent number is pretty high so everyone uses it for the advertising benefit. But it also requires a dead air space to achieve that number, which no one really has. Like in the walls, it is in direct contact with the outside skin on one side and the fiberglas or foam insulation on the other. It easily conducts thermal heat (bad) which is the biggest problem in the real world (it works great in outer space where it was designed to be used and IR is the big issue). Foil is cheap and lightweight, but if it was really so great for use on earth, then every house would use it as well, but there is zero use in the home building industry.

Also, brands will quote a high floor R value, that "best case" number where they add foil in the underbelly. But 25% of the floor area is outside of the main frame rails and the 75% within the rails still has 8 inch or taller I beams that conduct a huge amount of heat around the sides of that foil, so in truth just the R7 floor insulation is doing any good.

Unless you are going to buy a Mobile Suites or another expensive and heavy brand, you won't find walls thicker than 2 inches and therefore you really can't get more wall insulation than R7. It takes a 3-1/2 wall (like MS has) to get to R11.

I could say a lot more, but anyway don't make your buying decision based on what one brand claims vs. another. Most of the numbers are bogus.

[travelin texans]

When they advertise them as "4 season coach" they actually mean "yes" you can use them all 4 seasons not that you'll be comfortable in extreme heat/cold.