Page 271 - Masonry and Concrete

Masonry Veneer

270 CHAPTER SEVEN

Masonry flashing can be made of metal, rubberized asphalt, plastic,
or rubber sheet membranes and other composite materials. There are
several criteria to consider in selecting flashing materials:

■ Imperviousness to moisture penetration

■ Resistance to corrosion from the caustic alkalies in mortar
■ Resistance to puncture, abrasion, and other damage during con-
struction
■ Formability

■ Resistance to environmental deterioration

Cost should be considered only after other criteria are met. The quan-
tity of flashing in a building is relatively small, and even a big savings
in material cost is seldom significant in the overall project budget.
Plastic flashings are widely used in residential construction. They are
inexpensive and easy to handle, and many are tough and resilient.
Polyvinyl chloride (PVC) flashings are the most common among the
plastic flashing materials. They are homogeneous and impermeable to

FIGURE 7-22

Mastic dampproofing.

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