What is the correct way to insulate around a metal vent flue pipe running through a square ceiling chase opening? If blow-in is used the chase opening remains uninsulated, and how to keep clearance away from pipe?
Is this for your own house?
Using a metal thimble with mineral wool insulation above the thimble, keeping necessary space clearance, if any, per vent’s manufacturer specs.
2 Likes
Simon’s got it!
Welcome o our forum, Allan!..Enjoy! 
1 Like