When putting in our MetalFab Class A chimney last year I was suprised to see that the removable cup at the bottom is secured to the chimney with just a couple self tappnig screws. It seems like it makes for a poor seal.
I'm not haveing any major issues with draft, but I was wondering if it's a best practice to seal the cup....maybe with unfaced insulation or rockwool?
This is the cap:
I'm not haveing any major issues with draft, but I was wondering if it's a best practice to seal the cup....maybe with unfaced insulation or rockwool?
This is the cap:
