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
Codes and Standards | Dec 10, 2019
Utilities rolling out more grid-interactive efficient building programs
Focus is on energy savings and demand flexibility.
Codes and Standards | Dec 9, 2019
Canada’s Zero Carbon Building Standard reports first 10 certifications
Projects include new and existing offices, schools, and warehouses.
Codes and Standards | Dec 6, 2019
New research examines flood mitigation policies in the U.S.
Thirteen states or cities have adopted effective measures; some restricting development in vulnerable areas.
Codes and Standards | Dec 5, 2019
USGBC unveils vision for LEED Positive
Roadmap will lay foundation for a future LEED that is regenerative.
Codes and Standards | Dec 5, 2019
Report shows reducing embodied carbon can save money and help mitigate climate change
Embodied carbon now accounts for 11% of global greenhouse gas emissions.
Codes and Standards | Dec 5, 2019
Dubai, London and New York are 2019’s ‘Construction Mega Cities’
From 2007 to 2025, GlobalData expects the cities’ combined gross domestic product (GDP) to increase by more than US$8 trillion to US$20.4 trillion.
Codes and Standards | Dec 2, 2019
New GBCI certification recognizes expertise in sustainability
Provides third-party verification of competency to ‘making the world more economically, socially, and environmentally sustainable.’
Codes and Standards | Dec 2, 2019
New tool allows users to learn how to reduce embodied carbon
Calculator delivers first digitized EPDs.
Codes and Standards | Dec 2, 2019
Trade group challenges St. Petersburg, Fla., ordinance on construction contract mandates
Legality of requirement to hire apprentices, disadvantaged workers at issue.
Building Owners | Dec 2, 2019
What building owners and AEC teams need to know about New York’s Climate Mobilization Act
On April 18, 2019, the New York City Council passed the Climate Mobilization Act, a suite of laws aimed to meet the city’s commitment to achieving carbon neutrality by 2050.
