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Scratch Coat

Tuesday, September 15, 2009
posted by Craig

This application of cement mortar over wire and paper is essentially the same as interior plaster and   stucco on a exterior wall. Difference mainly here will be the wire used, which in a tile mortar bed float the wire has 1/4″ diamond holes to hold the cement, where typical stucco covered wire a standard application is chicken wire type with 1″ voids. Using the same mortar mix and scratch coating as well as floating the exact same method.floating the scratch coatThis first coat is considered by most the scratch coat as to just cover the wire and to not get too thick at once because the cement has a tendency to try and dry from the inside out and will crack, so a 3 coat approach is the system. Scratch, float and finish but the tile mortar bed need only a floated flat and level 2nd coat.



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