Transcription of NCMA TEK
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NCMA TEK
TEK 19-4A 2008 National Concrete Masonry Association (replaces TEK 19-4) ncma TEKN ational Concrete Masonry Associationan information series from the national authority on concrete masonry technologyFLASHING STRATEGIES FOR CONCRETE MASONRY WALLSTEK 19-4 AWater Penetration Resistance (2008)Keywords: fl ashing, fl ashing materials, maintenance, mois-ture, vents, wall drainage, water resistance, weep holesoC), water vapor can accumulate on a cold surface and form frost or increase the quantity of ice within the masonry. Although it is commonly thought that moisture problems stem only from the external environment, this is not always the case. For example, in some instances it is possible for the humidity of interior air to cause water damage to the exterior of a structure.
to Standard Speci fi cation for Solder Metal, ASTM B 32 (60% tin and 40% lead) (ref. 5). Stainless steel drip edges used in combination with other fl ashing materials offer an economical compromise with a durable drip edge.
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