Question: what is the top layer of concrete called
Answer: Screed has three meanings in building construction : 1 ) a flat board ( screed board , floating screed ) or a purpose - made aluminium tool used to smooth and true materials like concrete , stucco and plaster after it has been placed on a surface or to assist in flattening ; 2 ) a strip of plaster or wood applied to a surface to act as a guide for a screed tool ( screed rail , screed strip , screed batten ) ; 3 ) the material itself which has been flattened with a screed ( screed coat ) .