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.
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.
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.
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.
When repointing mortar joints in an existing structure, successful long-term performance depends on a number of factors. A lack of understanding of substrate materials and conditions, insufficient joint preparation, less than adequate skill or care during mortar installation and curing, and an overly limited repointing scope can lead to premature failure of a masonry joint repointing program.