Terra cotta: To repair or not?

Terra cotta is generally durable, but when façade rehabilitation is planned, one of the most challenging questions is whether a distress condition that is observed requires repair or replacement of the unit, or can be left as is.
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Failures: Rain, wind, and louvers

FAILURES
Deborah Slaton, David S. Patterson, AIA, and Jeffrey Sutterlin, PE

This function becomes more complicated when considering wind-driven rain and the project-specific variations of magnitude, intensity, and duration of rainfall and wind speed. Since the directionality of wind-driven rain can change throughout...

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Moisture in mass masonry walls

In mass wall construction, proper detailing is required so that the wall will shed bulk water. Key details include overhangs that protect the vertical wall below; drips at projecting features such as sills; and sloped skyward-facing surfaces to provide positive drainage.
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Late-emerging defects with insulating glazing units

To meet performance demands for energy conservation, noise resistance, heat gain, and indoor comfort, designers often specify insulating glazing units (IGUs). Annealed, heat strengthened, and tempered glass are produced by suppliers and shipped to fabricators for assembly, to meet specified design criteria.
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It is time to saddle up!

Moisture-related problems are common at critical interface conditions in the building enclosure due to discontinuities in the air/moisture control layers. One such instance is where a parapet at a lower roof meets an exterior rising wall of an upper floor or another enclosure assembly.
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Reroof or re-cover?

Two options can be considered when a new roof is needed on an existing building: completely remove and replace all existing roofing materials (replacement), or install a new one over the existing roof (re-cover).
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More about repointing: Matching sand

As noted in previous columns, successful long-term performance for repointing mortar joints in an existing masonry structure requires the development of an appropriate mortar mix, proper installation, and correct designation of the type and extent of work required.
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Innovative in-situ repairs of stucco-clad EEEs

Recent collapses of exterior elevated elements (EEEs) like balconies, walkways, and stairs have caused injuries and fatalities, leading to increased scrutiny of these features. Based on decades of experience inspecting and repairing these structures, stucco-clad EEEs on weather-exposed elevations are particularly susceptible to structural damage and catastrophic failure than...
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