Next is the Scratch coat,which may be a base layer of field-mixed hydraulic cement,sand,lime and water with a series of horizontal lines scratched into it.Then is the brown coat. this layer is applied with a darby or a long trowel to make sure that cement is applied evenly.
Proper Preparation is required for the application of Scratch coat.
Scatrch coat sre particularly important within the world of vertical decorative concrete.A scratch coat can make or break the work and this is said because in vertical decorative concrete,contractors must disable tons quite a daily plaster application. Many times we are laying on 1''of the fabric and even up to 3''-4''of fabric.This needs an honest rough surface with many aggressive texture to assist hold material firm during the appliance process.If you've got a really smooth scratch coat or brown coat,there's nothing to assist the load of the combination.Your completely reling on the bond of the products to carry fast to the wall.With an aggressive scartch coat,not only does one have a bond but you furthermore may have a mechanical bond and this is often key for thick application of vertical decorative concrete mixes.
