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Open Roads Forum  >  Fifth-Wheels

 > Some 5th wheels actually advertise R-38 ceiling/floor.....

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Dayle1

Spicewood, Tx

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Posted: 01/22/13 07:30pm Link  |  Print  |  Notify Moderator

For radiant barriers to achieve high R values, they require an air space on at least one side. Sometimes the air space must be a dead air space of significant thickness, like the 6 to 10 inches available in typical house rafters (something not available in RVs). And a dead air space means no air flow, rather than a leaky air space.

In RVs, this stuff is used in slide outs where it is in direct contact on both sides. Same thing when used in an RV ceiling. Here is what Reflectix says about these situations.

Question "What if There is No Air Space Present on Either Side of the Product?"
Answer "No Air Space = No Reflective Insulation Benefit
(An R-1.1 is provided from the product itself for the Reflective/Double Bubble material.) "

When used in an underbelly, it is frequently in direct contact with the belly liner and an air space above, but it is not a dead air space if there are holes thru the main frame rails for the slide outs, etc and holes thru the floor for wires and plumbing.


Larry Day
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JEBar

Willow Springs, NC

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Posted: 01/22/13 08:50pm Link  |  Print  |  Notify Moderator

Dometic offers free use of their "Extreme temperature testing chamber" to RV manufactures in which they test and certify lines of campers by the way they handle temps from 0 to 100 degrees .... its one thing for manufactures to create an impression through advertising which emphases a given R rating and another to prove the effectiveness of their lines .... folks looking for a new camper who place a high value on insulation would be wise to ask prospective dealers for the results of the test .... if they don't have such info that would tend to indicate either their camper wasn't submitted or it did poorly .... either way, that should tell the prospective buyer something

Jim


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n7bsn

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Posted: 01/22/13 08:53pm Link  |  Print  |  Notify Moderator

A point to consider, is it doesn't help a lot if the rig is R38 ceiling/floor and R24 walls, if the rig is built so sloppy it leaks around the windows, door, slides, etc.

Shop for how tight the rig is.


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When someone tells you to buy the same rig they own, listen, they might be right. When they tell you to buy a different rig then they own, really pay attention, they probably know something you don't.

smkettner

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Posted: 01/22/13 09:36pm Link  |  Print  |  Notify Moderator

And if the air conditioner ducting leaks air into the ceiling cavity (like mine) it is all for naught.


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Greentreena

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Posted: 01/22/13 09:52pm Link  |  Print  |  Notify Moderator

I wouldn't want to spend more than a few days winter camping, which is what we do. I have a "winter" RV that is suppost to be well insulated, it is ok. The condensation is bad on the windows. I wouldn't want to live in these conditions. A much better plan is to tow it somewhere warm in the winter!


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topjimmy

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Posted: 01/23/13 12:07am Link  |  Print  |  Notify Moderator

We have lived fulltime in wet and cold winter condtions for 3 years now in the NW, matter of fact it has been in the low 20's for a week + now..NO PROBLEM, just have a dehumidifier in the living area and keep the roof vent in the bedroom open a crack and their is almost zero mold or condensation on the windows, we are as snug as a bug in a rug even in a 40ft 5th with 4 slides and 8 1/2 ft ceilings (thats alot of space to heat} the newer 5th's are ALOT better insulated than the old ones and when I mean old I'm talking early mid 2000's our "old" one was a 2003 and i can feel a big difference from our 2012

* This post was last edited 01/23/13 12:40am by topjimmy *   View edit history

aruba5er

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Posted: 01/23/13 09:15am Link  |  Print  |  Notify Moderator

I would say BULL. Owens Corning high density foam is R 10 for two (2) inches Johns Mansville is R4.1 for their best insulsafe. I can't see almost 2 ft ceiling to roof.

bailer6334

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Posted: 01/23/13 08:12pm Link  |  Print  |  Notify Moderator

Be careful. Not all R values are created equal. Went to a Foresr River Blue Ridge and it was advertised to have better R values than the Arctic Fox we traded for it. Spent the winter in Phoenix and the thing was cold & drafty. Traded it back for a Arctic Fox. I know they are tight! So far this year even in 20+ degree weather (yes even in Phoenix) we have been warm and toasty. In most cases you get what you pay for. Look at Cedar Creek, Montana, Bighorn and Cardinals. Might find them in your price range.


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Slownsy

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Posted: 01/23/13 04:03pm Link  |  Print  |  Notify Moderator

It is not that it don't work if used properly. What they do is taking itch item sepretly say 1/8" fiberglas, 1/8 " ply 2" foam reflective foil and ad the figers all to gether, but that is not how it works in reall life when aded all together.


Frank
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Cummins12V98

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Posted: 01/23/13 08:55pm Link  |  Print  |  Notify Moderator

Right from the Mobile Suites brochure.

Total roof R25

Total sidewall R16

Total floor R29

I think someone is feeding you a line!


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