Jess wrote:
2 story house with crawlspace located in Portland, Oregon.

Crawlspace is a "conditioned" crawlspace.

Since the crawlspace is "conditioned", this means that there are no
vents to the outside, the crawlspace walls (part cripple wall and part
concrete foundation wall) have an insulation and vapor barrier system
installed, vapor barrier system applied over the ground of the
crawlspace, and there is a heating system that keeps the crawlspace
area around 55 degrees.

Crawlspace has been converted to a "basement". I think it is not
necessary to explain this in order to get an accurate answer to my
question below.

A "room" has been built "inside" the basement. This room has its own
walls that are not part of the crawlspace walls and has a ceiling that
is not part of the crawlspace ceiling (house floor).

Question:

With the research I have done so far coupled with the fact I like to
do more than the minimum, I am thinking that I want to insulate the
2x4 walls and ceiling of the room "inside" the crawlspace with
fiberglass insulation, then wrap the inside of the room with
polyethylene, and then install drywall.

Comments????

Jess
Keyword = jessjoemama

Hidden soundproof room with no direct outside egress under the house.
Got it. How is air in the room exchanged? Is your insurance company
aware of it?

As to what to finish it with- it is still a basement/crawlspace.
Fiberglass and drywall will suck up any eventual floods or even basement
dampness from furnace going offline for a week while you are out of
town. Check borg or google for insulation and wall systems designed for
below-grade use.

--
aem sends...