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Construction deterioration & building durability glossary

Article & glossary hosted by A. Sebastian Engineering and Investigation Services

A vertical member of a structure whose horizontal dimension measured at right angles to the thickness exceeds three times its thickness.

A horizontal member anchored to a masonry wall to which other structural elements may be attached. Also called head plate.

A bonder or metal piece which connects wythes of masonry to each other or in other materials.

A rigid, corrosion-resistant metal tie which bonds two wythes of a cavity wall. It is usually steel, 3/16 in. in diameter and formed in a "Z" shape or a rectangle.

A strip or piece of metal used to tie a facing veneer to the backing.

That property of a mortar which prevents the rapid loss of water to masonry units of high suction. It prevents bleeding or water gain when mortar is in contact with relatively impervious units.

A projection of lower masonry on the outside of the wall slightly above the ground. Often a damp course is placed at the level of the water table to prevent upward penetration of ground water

Barrier which prevents the flow or passage of moisture through porous materials (masonry, concrete, etc.) due to water pressure. It can be succesfully designed for either below or above grade construction.

weath·ered; weath·er·ing/'we[th]-ri[ng], 'we-[th]&-/
Date: 15th century
transitive senses
weathering The action of the elements on a rock in altering its colour, texture, or composition, or in rounding off its edges. 1. Exposure to the open air and / or subject to the action of the elements, with the result of alteration of color, texture, composition, or form of exposed objects; specifically : the physical disintegration and chemical decomposition of materials; aging
2. Alternatively used as a noun to describe a slight construction slope designed to throw off rainwater
3. Changes on the surface of glass caused by chemical reaction with the environment. Weathering usually involves the leaching of alkali from the glass by water, leaving behind siliceous weathering products that are often laminar.
4. Response of materials (which were once in equilibrium within earth's crust) to new conditions at or near contact with air, water, or living matter. Also

Openings placed in mortar joints of facing material at the level of flashing, to permit the escape of moisture.

Wind, like stack effect, is a natural phenomenon. Wind increases the positive air pressure acting against a building on the windward side, and produces a negative pressure on the leeward side and on the walls parallel to the wind direction. The wind also exerts a suction on flat or low-sloped roofs and a positive pressure on the windward side of steeper-sloped roofs

Masonry designed with the higher stresses allowed under EBM. Requires the establishing of procedures on the job to control mortar mix, workmanship and protection of masonry materials.

Masonry designed with the reduced stresses allowed under EBM.

1. Each continuous vertical section of masonry one unit in thickness.
2. The thickness of masonry separating flues in a chimney. Also called withe or tier.

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