Is it necessary to cover the tops of masonry walls during construction?
Yes. Masonry walls under construction should be covered at the end of the work day. This prevents the top surface from getting dirty or excessively wet until work resumes. It also protects walls from drying out too fast along the tops. The tops of completed masonry walls also should be covered to prevent rainwater from entering. Excess water can cause efflorescence and, in freeze/thaw environments, saturated masonry walls may deteriorate. Plastic sheets typically are used to cover the tops of the walls. The plastic should lap about a foot on either side of the wall. Some wire manufacturers make special clamps to hold the plastic in place.