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 | Sep 17, 2019
California will enact rent cap bill limiting rent increases to 5% plus inflation
Applies to apartments built at least 15 years ago.
Codes and Standards | Sep 17, 2019
Zero energy buildings can be constructed with no added upfront cost
ROI can be realized in as little as one year.
Codes and Standards | Sep 13, 2019
Researchers use U. of Arkansas buildings as testbed for CLT panels
Investigation could influence future use of the materials.
Codes and Standards | Sep 13, 2019
At least 30 U.S. cities have adopted stricter building energy codes since 2017
Some followed their states in implementing more robust standards.
Codes and Standards | Sep 12, 2019
Illinois law sets maximum retainage on private projects
The change is expected to give contractors bigger checks earlier in project timeline.
Codes and Standards | Sep 10, 2019
Retreat may be the best option for some coastal communities in face of sea level rise
A new study makes the case for relocating in a "strategic, managed" manner.
Codes and Standards | Sep 9, 2019
Free app calculates maximum allowable heights and areas for buildings
A free app that calculates the maximum allowable heights and areas for buildings of various occupancy classifications and types of construction has been released.
Codes and Standards | Sep 6, 2019
Standard for assessing frame deflection using one component polyurethane foams updated
The standard offers guidance when installing fenestration products.
Codes and Standards | Aug 29, 2019
The high cost of gridlock: $166 billion per year
Growing economy means more jobs, more cars, more hours stuck in traffic.
Codes and Standards | Aug 29, 2019
Industry leaders ask for government help as trades shortage worsens
AGC asks for more funding for education and increased immigration to fill gaps.
