Need Help with Insulating HVAC ducts
To qualify for some energy efficiency rebates, we needed to insulate 25' of the HVAC supply ducts in our basement. I found this online that recommended using rigid Polyisocyanurate foam board to insulate the ducts.
We used duct mastic to seal the gaps in the existing duct work. Then we cut sheets of Super Tuff-R to the ducts to create a box (we used the board all the way around the duct as opposed to fiberglass batts on top). We installed the Super Tuff-R with the blue side out and the silver side facing the ducts attaching the pieces to the duct and each other with a UL 181 foil-backed. So far, so good. But a day after we finished the work, the tape is peeling away from the blue facing of the Super Tuff-R sheets. The tape sticks great when it's applied to the duct surface but it doesn't want to stay stuck to the blue Tuff-R surface. I did try burnishing the tape to get it to stay stuck but that hasn't really helped.
Does anyone have any suggestions for a tape that will stick to the blue face of the Super Tuff-R pieces? Or any suggestions on how to attach the insulation so that it stays in place?
Posted Sep 10, 2012 10:29 PM ET
Other Questions in Green building techniques
Installation of a firebox in a very old stone fireplace that is on an external stone wall and is very damp.