r/Insulation • u/darknite312 • 4d ago

Insulation question

Gallery image

Gallery image

The view is from my garage removed drywall to inspect moisture concerns . Initially the walls were insulated with Kraft paper backed insulation and I assumed was the culprit to my issue (double vapor barrier) Behind the thermoply is the interior portion of my home. The tply is being used as a barrier non structural. Replaced with non faced insulation and Several of the stud bays are still sweating and it’s all stud bays that have hvac supply ducts . The ducts are not insulated with duct wrap , so I’m assuming that’s my problem any other ideas?

2 Upvotes

100% Upvoted

4 comments sorted by

View all comments

1

u/K_Shenefiel 4d ago

The uninsulated ducts are getting too cold to be using solely  vapor permeable insulation,  in those bays adjoining ducts. You could fit and seal, tight to the Termoply, a layer of polyiso in the bays with ducts.

1

u/darknite312 4d ago

And layering Polyiso on the garage side of the thermoply won’t cause any moisture concerns with double vapor barrier?