Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

cp-10/cp-11 mastic really necessary for steam pipe insulation?

swihartaswiharta Member Posts: 1
edited November 21 in Strictly Steam
Is applying this mastic really necessary for exposed portions of fiberglass insulation placed on steam pipes? There should not be any condensation on the outside of the pipe, correct? So is the benefit just cosmetic? I would like to insulate the straight runs with pre-formed pipe insulation with ASJ and get to elbows and tees later. I'd rather just leave off the mastic if it isn't important.

And if there was a pipe leak, you would probably be better off having a way for water to get out so you notice the leak rather sealing up any exit points and soaking a larger amount of pipe and insulation.

Leave a Comment

BoldItalicStrikethroughOrdered listUnordered list
Align leftAlign centerAlign rightToggle HTML viewToggle full pageToggle lights
Drop image/file


It looks like you're new here. If you want to get involved, click one of these buttons!