Lime plaster over existing plaster and block
Hi, I am working on a fire restoration. The home is concrete block on the exterior walls that were previously finished with plaster. It looks like the block had been coated with an adhesive, and I have had had to grind down to the scratch coat to remove the heat and soot damage. The "key" has been broken in many spots-which are now down to the block. There is some remaining wire, but only around window and door frames. I have ordered NHL and want to mix it with different grades on sand to produce two or three coats. My biggest question is can I get this new lime plaster to adhere to the previous plaster of unknown origin and block. I have heard of "knocking up" or 'throwing'" a first coat- is this necessary? I have never plastered before. Any thoughts?
Posted Feb 13, 2013 7:46 PM ET
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