Reports of tests of water permeability of masonry walls indicate that water penetration is principally through openings between mortar and masonry units and that most important factors affecting water penetration are workman¬ship and those properties of masonry units and mortar which affect bond.nWorkmanship which contributes to minimum water penetration is characterized by completely filled mortar joints, particularly head joints.nImportant properties of brick and mortar which con¬tribute to complete and durable bond, and hence to mini¬mum water penetration, are: (a) rate of absorption of brick, when laid, of 20 grams per minute or less, (b) high flow (maximum water content) mortar.
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