Masonry Magazine December 2004 Page. 29
MORTAR
A huge improvement over pea gravel came when commercially available drainage materials were introduced to the marketplace.
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LETTER TO THE EDITOR
"Drainage systems" in masonry cavity walls seem to be becoming a catch phrase.
It's true that proper drainage in a masonry wall is essential to ensure the performance of all masonry structures. Masonry buildings have stood the test of time. Known for their strength, beauty and longevity, masonry structures are a statement of our past, present and future.
As one example, the proper use of quality masonry flashing is the one sure way to protect against moisture migration in a masonry structure. Copper flashings have long been the flashing of choice, providing decades of moisture protection. Only copper can boast a success story that dates back over 100 years. Resistant to all harmful effects of the acid and alkali present in fresh mortar, copper will out-perform all other flashing products. And, as mason contractors, you know that it is always important to get the most out of every construction dollar. An investment in copper flashing will bring a worthwhile return on any construction investment. Conversely, PVC and rubberized asphalt membranes presently being marketed as masonry flashings exhibit no characteristics to promote long life. It might be worthwhile to ask the manufacturer of your chosen flashing product to state the performance life of their products.
The Brick Institute of America suggests that a properly constructed brick wall should last at least 100 years. The cost of replacing failed flashing is outrageously expensive, and inferior flashing still remains the predominant cause of moisture migration in a masonry wall. Does it make sense to put retreads on a Rolls Royce?
Another example arises as we continue to learn more about the importance of positive airflow in cavity wall construction. This positive ventilation promotes the drying process of the interior cavity, thus retarding the possibility of mold growth. The Mortar Break system by Advanced Building Products was the first geosynthetic mortar deflection device, dating back to 1989. Independent testing by Architectural Testing Inc. proves the Mortar Break system provides for proper moisture drainage in a cavity wall while supporting positive airflow.
Recently, the performance of straight cut mortar deflection and airflow-enhancing products have been questioned by a competing company that markets a dove tail-shaped product. The test results are in, and both the straight cut Mortar Break system and the competing dove tail product do a good job in keeping the cavity clean and water draining from the cavity. The independent testing also revealed that, when proper weep vents are installed, the airflow ventilation allowed by the straight cut product exceeded that of the dove tail products.
With this misunderstanding cleared up, the masonry industry is free to use either system. An informed consumer always benefits by honest competition.
Masonry construction dates back to the beginning of the construction industry. A proud past and a promising future lie ahead for the masonry industry when value engineering does not compromise quality products.
Richard A. Lolley
President & C.E.O.
Advanced Building Products, Inc.