[JUNEBUG 88]

I was up in the attic installing the fresh air intake for the fireplace and I noticed that inside the chase there was a layer of frost on the wood. Currently we are still waiting (months) for the fireplace to be completely installed due to numerous delays by installers. The chimney vent is not installed yet.
The contractors (not installers) stated that they usually do not insulate the chase. At this time there are only the wood walls and a wrap with a wood top. Vinyl siding will eventually cover the walls. The chase is approx. 6' tall.

NOTE: Inside the attic there is NO frost on any other roof sheathing only inside the chase.

If it should be insulated should it be on outside or inside walls of chase. There was no provision for the insulation prior to this so it may be to late to install on exterior prior to siding. Since, siding may extend out beyond the top edge although I am not sure. The chimney is 8" ASHT double wall and the chase is about 24" x24".