If I am not mistaken 557 has a UL Listing but has a warnign Not A To Use On Sheet Metal ...
Originally posted by soshin
I am in the middle of a residential construction project where they have just started putting in the HVAC system. I am talking to the installer about how important it is that the system be sealed well, that I want a blower door test once everything is finished, etc.
The topic comes around to how they are sealing the seams, particularly on the hardpipe and around the joints. He told me that the joints were screwed then taped using a UL 557 product.