Poly-encapsulated fiberglass

[Arky217]

If I used poly-encapsulated (no perforations, but open at ends) fiberglass insulation in the walls, would that greatly lessen the chance of condensation occurring within the fiberglass ?
Planing on the walls having drywall on the inside and plywood/felt/vinyl siding on the outside.

Also, should I still use a vapor barrier behind the drywall for Arkansas's climate ?
(100+ at times in the summer, and occasionally single digits in the winter, also can be very humid at times)
(I've read where some suggest that there should not be a vapor barrier in the walls in hot, humid climates; don't know if Arkansas would qualify as that.)

[MountainDon]

If you haven't already you should check ouy the Building Scirnce website

Here's something on new proposed vapor barriers
    http://www.buildingscience.com/resources/vapor_barrier_code_changes

and this page that has designs for various climates
    http://www.buildingscience.com/doctypes/primer/

[n74tg]

Arky:

Please do what MountainDon said; get familiar (real familiar) with the information at BuildingScience.com.  You want to be reading everything you can get your hands on about the Mixed-Humid climate region.  Failure to do so and to understand and correctly apply what you learn there can lead you to make some seemingly minor mistakes that have major long-term consequences.

For instance, you want to understand very well the difference between a vapor barrier and a vapor retarder, where they should be placed in the wall (a function of the climate region you live in), and actually, if you should even have one at all.  Maybe even more important than a vapor retarder (in this climate region) is a good, effective air barrier. 

Good luck with it.

[Arky217]

I have read the information at buildingscience.com but it kind of gets confusing.
What I was wondering about is:
Lowes has John Manville encapsulated fiberglass insulation in continuous rolls, 15" wide by 8.25" thick.
Since I am planning 8" walls, I thought this would be a good choice for the wall insulation, especially since the fiberglass is totally encapsulated (except the cut ends of course).
I plan on using drywall inside and use Avantech plywood sheathing on the outside; then vinyl siding over the plywood.

What else would you add, in anything, in the way of vapor barriers, etc. to this arrangement for Arkansas's climate ?

Thanks,
Arky

Never mind this reply.
I just found out that I was misinformed; the John Manville rolls are not totally encapsulated, but are perforated on the back and sides. The encapsulated feature is for convenience in handling.

Thanks,
Arky

[glenn kangiser]

Sounds like an interesting way to do it- I hate fiberglass insulation for working with.