Concealed spaces are often overlooked during early design, but they can play an important role in the overall fire-protection strategy of a building. In sprinklered buildings, hidden voids such as ceiling plenums, attics, interstitial cavities, utility chases, and underfloor spaces must be carefully evaluated to determine whether sprinkler protection is required.

Air leakage has long been one of the most significant—and least visible—sources of energy loss in buildings. Even well-insulated assemblies can underperform when uncontrolled air movement bypasses the thermal barrier, carrying heat and moisture through gaps and discontinuities.

Parapets at exterior walls serve a simple but critical purpose: they preserve the continuity of fire separation where a rated wall meets the roof. Without this vertical extension, flames, radiant heat, and hot gases can readily bypass the wall by traveling across the roof membrane, undermining the very separation the wall was intended to provide. For this reason, the International Building Code (IBC) requires that exterior walls intersecting the roof be extended upward as par

Modern multifamily and mixed-use buildings increasingly utilize high-performance exterior wall assemblies incorporating continuous insulation, air barriers, rainscreens, and lightweight claddings. While these systems provide significant improvements in energy efficiency and constructability, they frequently introduce combustible materials within wall cavities.

The Commonwealth of Massachusetts adopts the 2021 IBC as the basis for its state building code (780 CMR), but enacts a critical modification to the high-rise definition. The Massachusetts amendment lowers the high-rise threshold to 70 feet, measured from the grade plane to the average height of the highest roof surface.

Galvanic corrosion is one of the most common yet frequently overlooked durability problems in construction and building systems. It occurs whenever two dissimilar metals are placed in electrical contact in the presence of an electrolyte such as water, condensation, or damp concrete.

The decision between a wrap membrane and an adhered membrane should not be based on material cost alone. It should consider building height, exposure, wall complexity, cladding type, construction sequencing, contractor experience, substrate conditions, and the required level of air- and water-barrier continuity.

Uncontrolled air leakage can transport significant quantities of water vapor into wall and roof cavities, where condensation may occur. In fact, air leakage typically moves an order of magnitude more moisture than vapor diffusion, making air control the most critical component of enclosure moisture management.