My supplier sells pre-painted black backboards, 2'x4'x3/4" plywood sheets, for about $18. each. I use them all the time on masonary basement walls. Also makes nailing/fastening cable easy. If I think my customer is adding phone and/or alarm equipment I'll install a second board adjacent to the first for that equipment. For commercial or industrial jobs I tend to go with Kindorf or Versabar for installation of conduit, cabinets, etc. on masonary walls.
Andy
[This message has been edited by cavo148 (edited 10-07-2004).]
