Flashing must not be taken for granted, as one can only get away with so much before leaking walls destroy a reputation and a completed project.
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Flashing takes discipline, as the most anyone will see is the bent edge of a drip edge or a weep vent, but doing it correctly usually determines whether or not the job is profitable for everyone involved. As with all things, flashing masonry has a few standard rules.
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Roofs are subject to very extreme physical and environmental conditions. They are, for the most part, the first line of defense against exterior elements, and, in many instances, the most neglected building element. Roof maintenance does not have to be a very complicated and time-consuming endeavour.
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Flashings are critical to ensuring moisture does not have an opportunity to enter wall assemblies. However, many designers cannot agree on flashings because what constitutes the products themselves is poorly defined. A flashing is a material put in place to prevent water penetration, or to direct the water flow away from the building.
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Control of rainwater is a primary function of the building enclosure. Water penetrating the roof, wall, and foundation can cause deterioration of the building’s structure, damage to property, and mould growth. Water on the surface or penetrating the building enclosure’s outer layers can cause corrosion and decay of sheathing and cladding attachment systems, staining and discoloration of cladding systems, and freeze-thaw damage to masonry materials.
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When waterproofing a walkable roof deck, there are a number of important principles to consider in determining the ultimate performance of not only the decking assembly, but also the waterproofing and the overall building envelope. These can be thought of as the Six Ds.
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The restoration of the Lieutenant F. Campbell, VC, Barracks in Meaford, Ont., required brick façade replacement to its military residence. The owner, Canadian Department of National Defense (DND), identified masonry deterioration due to the spalling of brick at the base of foundations and at lintels over most windows. The primary reason for this situation was the through wall flashings had failed to provide effective drainage from the cavity.
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