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Slate / Copper Roof Cleaning

Richard Bond

New member
Hey Guys, Its been quite a while since I've been on.. Hope everyone has been as busy as we have this season! I'm actually looking forward to the coming off-season up here in Maryland. I could use a little help here, I looked at a nice slate roof today that has efflorescence coming down off the stone chimneys unto the slate roof. The slate roof is also bordered by another roof made of copper, hence my problem. Has anyone ever removed the white chalky efflorescence off slate and if so will that same chemical be detrimental to the copper roof? I've already put in a call to Craig with "F9 Barc" but was hoping for feedback here as well..

Thanks in advance!

Richard BondIMG_2362.jpgIMG_2374.jpg

AC Lockyer

UAMCC Associate Member

F9 makes an efflo remover now. I'd try that. Remember there is natural iron in real slate so it may bring out some yellowing like bleach does from time to time.