Add insulation?
 

My rear facing wall of my atrium had some rot issues due to poorly installed vinyl siding. So I can do it simple and just replace the rotted siding and leave well enough alone or.......

I can add insulation to the small voids where it never had insualtion.
Understand this is an unconditioned room in the middle of our house.
Use to have a hot tub.

The inside walls were sheeted then covered with cedar T&G.
I'm concerned about trapping moisture. The voids are less than 24" square.
With a glass roof will it even matter?

Thoughts?

http://ecorenovator.org/forum/attach...m-wall-003-jpg

http://ecorenovator.org/forum/attach...m-wall-004-jpg

http://ecorenovator.org/forum/attach...m-wall-005-jpg

http://ecorenovator.org/forum/attach...m-wall-006-jpg

http://ecorenovator.org/forum/attach...on-attrium-jpg

To clarify the voids are on either side of the windows not above them.

If you just use fiberglass insulation you will not air seal it , it will still breath.
Insulate with fiberglass then put up Chip board then tyvek then the siding would be my approach.