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Open Roads Forum  >  Fifth-Wheels

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

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ramyankee

Northern California

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Posted: 01/22/13 01:24pm Link  |  Print  |  Notify Moderator

While others "that look comparable" are stating R-7/R-14/R-14. R-38 really sounds impossible in what seems like a fairly limited space.
What we are looking at right now is the Wildcat maxx. Nice floor plan and "feels nice" inside. Large tank capacities and advertises R-38 floor and ceiling.
We love the Arctic Fox but price wise is a bit steep......
And around Sept 2015 we HOPE to be full timing.
Thanks for any feedback


Rick and Patti
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3 dog nights

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Posted: 01/22/13 01:33pm Link  |  Print  |  Notify Moderator

What is the R value of the walls? if not comparable to roof and floor, won't temps just travel sideways.

ramyankee

Northern California

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Posted: 01/22/13 01:37pm Link  |  Print  |  Notify Moderator

I cannot find the R Value of the walls but figure the best they could have was R-14.....All the brochure stats is Fiberglass fiber roof insulation (R-14), R-38 with Astrofoil.....Same stated for floor.....

C.B.

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Posted: 01/22/13 01:37pm Link  |  Print  |  Notify Moderator

I think you'll find more models in the Forest River line up that offer R-38 in the floor,cieling,and end caps.


C.B.


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C.B.

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Posted: 01/22/13 01:43pm Link  |  Print  |  Notify Moderator

3 dog nights wrote:

What is the R value of the walls? if not comparable to roof and floor, won't temps just travel sideways.




Brochure states sidewalls are R-10


C.B.;

Robin1953

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Posted: 01/22/13 04:13pm Link  |  Print  |  Notify Moderator

when I read some literature on some models regarding the R-38 in the slides it said it was calculated...what ever that means.


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georgej

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Posted: 01/22/13 04:40pm Link  |  Print  |  Notify Moderator

My house has r-38 ceiling insulation. On a house that requires about two feet of fiberglass. Wish I'd heard of astrofoil before...

Dayle1

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Posted: 01/22/13 06:38pm Link  |  Print  |  Notify Moderator

If you read the fine print, it will very likely say "calculated R value" and/or "equivalent R value". Calculated really means best case R value not average or worst case, and best case is the combined R values for all components even if all components don't exist over then entire floor. For example, frequently the underbelly only runs between the main frame rails (and that is where the max R value will occur), but the floor area from the frame rails to the side walls will have far less insulation and with a distance of around 12 inches, that represents 25% of the total floor area.

Roof, same thing, max R value will occur where the roof is the thickest, but will be less as the roof tapers. Also, the AC ducts occupy a significant roof area, length x width x thickness and therefore result in a major reduction in actual R value.

My understanding is that astrofoil has an "equivalent R value" that while an impressive number, really doesn't insulate like expected. Maybe someone else can provide more detail. Anyway, true insulation requires real wall, floor and ceiling thickness to provide real R values. R30 requires about 6 inches of rigid foam or about 11 inches of fiberglas. No manufacturer can achieve true R38 floor and roof insulation in a fiver with 6 ft bedroom height and still keep the overall height under 14 ft tall.

Finally, with slide out seals, aluminum frame windows, uninsulated roof vents and many other air leaks and poorly insulated areas, the average RV has a significant surface area that is inadequately insulated that would make real R38 insulation in other areas totally ineffective.


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thomasmnile

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Posted: 01/22/13 06:53pm Link  |  Print  |  Notify Moderator

Radiant Barrier Explained

Reflects radiant energy, but seems RV manufacturers are marketing it as additional "insulation". In stick n' brick, it's usually installed directly under the roof deck between the trusses. Where do they put in an RV's "attic"? Makes you wonder what good it does in the subfloor, outside of reflecting lost heat from living area back toward the underside of the floor.

Pete_k

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Posted: 01/22/13 06:54pm Link  |  Print  |  Notify Moderator

georgej wrote:

My house has r-38 ceiling insulation. On a house that requires about two feet of fiberglass. Wish I'd heard of astrofoil before...

Astrofoil is the best. WE had it put in our Attic of our stick and brick. Saved a lot of our heating and cooling. Wish they would use it all over on the 5th wheels. Our Key largo has it with the package we had added. Here is the normal numbers.
TOTAL INSULATION VALUES
Walls - R9 Insulation
Roof – R23 Insulation
Floor System - R35 Insulation
Slide Room Floors - Radiant Technology R38 equivalent


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