Hollow concrete block masonry provides a very even surface which does not necessitate plaster on the interior surface of walls, thus effecting a further substantial economy. Even where walls are to be plastered, concrete block masonry is more economical since the regular-sized units result in walls with true plane surfaces which require a minimum amount of mortar for satisfactory coverage. There is no loss of material in filling hollows which result when irregular-sized units are used. Concrete block masonry also provides a surface to which plaster adheres readily, a factor of considerable importance in obtaining rapid application. Contractors quote special reduced prices when plaster is to be applied on a concrete block masonry wall.

Hollow concrete block masonry provides a very even surface which does not necessitate plaster on the interior surface of walls, thus effecting a further substantial economy. Even where walls are to be plastered, concrete block masonry is more economical since the regular-sized units result in walls with true plane surfaces which require a minimum amount of mortar for satisfactory coverage. There is no loss of material in filling hollows which result when irregular-sized units are used. Concrete block masonry also provides a surface to which plaster adheres readily, a factor of considerable importance in obtaining rapid application. Contractors quote special reduced prices when plaster is to be applied on a concrete block masonry wall.