A new technical brief from SPRI, the trade association representing the manufacturers of single-ply roofing systems and related component materials, addresses construction-generated moisture and its impact on commercial roofing systems.
Construction-generated moisture comes from activities including pouring concrete, burning propane heaters, painting, plastering, and drywall finishing. These activities can contribute to excessive levels of relative humidity inside the structure when proper remediation measures are not taken. Accumulation of condensation within the roofing assembly and within the structure can result when the temperature is at or below the dew point.
To control moisture, designers must identify the sources of moisture and develop a remediation plan during the design process. To reduce the probability of condensation, buildings under construction must be adequately ventilated, particularly during concrete hydration and other high moisture-related construction activities.
SPRI recommendations include avoiding the use of wet materials or materials with excessive moisture, installing vapor retarders in the roof assembly, avoiding penetrating vapor barriers, installing at least two layers of insulation, and always sealing deck-to-wall joints and gaps around roof penetrations.
Related Stories
AEC Innovators | Aug 27, 2019
7 AEC industry disruptors and their groundbreaking achievements
From building prefab factories in the sky to incubating the next generation of AEC tech startups, our 2019 class of AEC Innovators demonstrates that the industry is poised for a shakeup. Meet BD+C’s 2019 AEC Innovators.
Giants 400 | Aug 16, 2019
2019 Healthcare Giants Report: The ‘smart hospital’ is on the horizon
These buildings perform functions like a medical practitioner. This and more healthcare sector trends from Building Design+Construction's 2019 Giants 300 Report.
AEC Innovators | Aug 15, 2019
Oracle’s replica of a construction jobsite creates an immersive environment for AEC professionals
The Oracle Construction and Engineering Innovation Lab allows visitors to walk through five different stages of construction work, to test new AEC technologies and training techniques.
Giants 400 | Aug 13, 2019
2019 Science + Technology Giants Report: Operational flexibility is a must for S+T buildings
The science and technology (S+T) sector is arguably the industry’s most complex because it caters to a diverse clientele with specific priorities and imperatives, according to Building Design+Construction's 2019 Giants 300 Report.
Giants 400 | Aug 8, 2019
Top 110 Office Sector Construction Firms for 2019
Turner, STO Building Group, AECOM, Clayco, and Clark lead the rankings of the nation's largest office sector contractors and construction managers, as reported in Building Design+Construction's 2019 Giants 300 Report.
Giants 400 | Aug 8, 2019
2019 Office Giants Report: Demand for exceptional workplaces will keep the office construction market strong
Office space consolidation and workplace upgrades will keep project teams busy, according to BD+C's 2019 Giants 300 Report.
Museums | Jul 29, 2019
A new museum debuts inside the Empire State Building
A $165 million, 10,000-sf museum opened on the second floor of the Empire State Building in New York City, completing the second of a four-phase “reimagining” of that building’s observatory experience, which draws four million visitors annually.
Multifamily Housing | Jul 23, 2019
Is prefab in your future?
The most important benefit of offsite construction, when done right, is reliability.
Healthcare Facilities | Jul 15, 2019
Can a kids’ healthcare space teach, entertain, and heal?
Standard building requirements don’t have to be boring. Here’s how you can inject whimsical touches into everyday design features.
BD+C University Course | Jul 8, 2019
Shadow box design: To vent or not to vent [AIA course]
A curtain wall shadow box is a spandrel assembly consisting of vision glass at the building exterior and an opaque infill at the interior side of the curtain wall system. This course is worth 1.0 AIA LU/HSW.
