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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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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The CSI College of Fellows has selected five new members to the 2020 class. Each  Fellow was nominated through a rigorous application process, and then elected by the Jury of Fellows for membership. Fellowship is one of the top two honors given by the institute.
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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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