PTAC units: All about the details

To provide personalized temperature control, while maintaining low initial costs and simplified installation, hotels and dormitories often use packaged terminal air conditioning (PTAC) units. However, penetration of façade systems with PTAC units compromised by poor detail design and/or improper installation has led to water infiltration and moisture-related problems.
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Too cold for installation

The effects of cold on buildings are widely varied.* One of the more extreme examples of damage is cracking and spalling of masonry when water trapped within the pores of masonry units expands with cyclic freezing and thawing.
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Spontaneous glass breakage (or not)

The use of fully tempered (FT) glass is common in the building industry. While its increased strength (approximately four times stronger than annealed glass and twice as strong as heat strengthened) and distinctive breakage pattern that can reduce the potential for injury are regarded as benefits, its use should...
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Look out below

The decision to replace an existing roof is often made in response to ongoing water leakage rather than as part of a proactive maintenance regimen, as owners and facility management companies attempt to obtain the last ounce of serviceability out of their building systems to manage cost. Unfortunately, such...
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Expanding on structural steel

The effects of corrosion on metal building components range from aesthetically undesirable appearances to hazardous structural conditions. This is particularly the case for masonry buildings constructed in the early 1900s, where unprotected structural steel is often in contact with exterior wall construction.
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What were they thinking?

On a building constructed in 1929 with exterior loadbearing masonry walls, modifications were made to loadbearing masonry demising walls during past renovation efforts. A recent investigation has revealed these modifications present a serious structural stability problem for the building.
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Constraints with site planting

Site planting is an important part of most construction projects. When done correctly, planting can add the final touch to a project. Plants may be valued for their aesthetics, but they are living things, and have specific requirements, including nutrition, water, and sun. Failure to meet these basic requirements...
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Two domes of a different color

Two nearly identical domes constructed in different climate zones provide an opportunity to evaluate the ways in which environment and weather affect service life and performance of construction materials. One of the domes is located in the Southeast, in a hot, humid climate, and the other is located in...
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