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An experienced surveyor would usually be able to pinpoint the cause of damp, for example a leaking gutter causing rainwater to cascade and saturate the external structural wall which in turn causes rainwater to ingress internally and adversely affect the internal building fabric.
Initial leaking is possible until the waterstop expands to seal the joint. The American Concrete Institute recommends against the use of hydrophilic waterstops for hazardous fluids such as fuels, acids, and process chemicals, as the products may not swell as intended in fluids other than water.
Finlock concrete gutter units are made up of two troughs – one is the visible gutter and the other sits across the cavity wall. The blocks which can range from 8 to 12 inches (200 to 300 mm) can be joined using reinforcing rods and concrete , to form lintels for doors and windows.
Flashing is thin pieces of impervious material installed to prevent the passage of water into a structure from a joint or as part of a weather resistant barrier system. In modern buildings, flashing is intended to decrease water penetration at objects such as chimneys , vent pipes, walls, windows and door openings to make buildings more durable ...
The joint is then heated, typically by using a propane or MAPP gas torch, although electrically heated soldering tools are sometimes used. Once the fitting and pipe have reached sufficient temperature, solder is applied to the heated joint, and the molten solder is drawn into the joint by capillary action as the flux vaporizes. "Sweating" is a ...
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German masons repointing a wall in 1948. Repointing is the process of renewing the pointing, which is the external part of mortar joints, in masonry construction. Over time, weathering and decay cause voids in the joints between masonry units, usually in bricks, allowing the undesirable entrance of water.