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Slate Roof Central Message Board » Traditional Roofing Magazine » Compatibility of terne (non-stainless) with roofing cements « Previous Next »

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Joe Jenkins
Posted on Wednesday, August 30, 2006 - 12:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Standard trowel grade roof mastic (roof cement) is compatible with terne metal, as is liquid asphalt emulsion alone or with fiberglass membrane. You can also use fiberglass membrane with standard trowel grade roof mastic as a fortifier. Roof cement alone will crack over time - the fiberglass mesh helps prevent that from happening.
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Paul R. Ogushwitz
Posted on Monday, August 28, 2006 - 02:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

We are starting roof repair on terne metal cladded wraparound porch with box gutters on our circa 1910 Craftsman home. Some web postings claim that roofing cement is incompatible with terne and will corrode it. Other postings (see thread "copper flat seam panel" on this message board) claim that good results are achieved with fiberglass membrane embedded in liquid asphalt. This being the internet, it is difficult for me to determine which posts contain accurate info. My questions: (1) Is asphalt roofing cement incompatible with terne metal? (2) Are non-asphalt roofing cements available that are compatible with terne metal? (3) If we must avoid roofing cements altogether, can anyone comment on "Acrymax" from Preservation Products? (4) Do other products exist similar to "Acrymax"? Thank you.

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