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Unread 02-22-2008, 05:43 PM   #5
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 13,483
Lath is required for over a plywood subfloor. After you have cbu down, it's basically a cement floor. Adding lath would strengthen it, but I'm not sure if it is enough to worry about. Fastening the lath down could be a pain, but it would give you something to tie the wire to. Read the fine print on the slc instructions and see what the others have to say. You need the primer, regardless.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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