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 | Mar 5, 2015
AEC industry groups look to harmonize green building standards, codes
The USGBC, ASHRAE, ICC, IES, and AIA are collaborating on a single green code.
Codes and Standards | Mar 2, 2015
Nevada moves to suspend prevailing wage rules on school projects
The Nevada Senate approved a bill that would suspend prevailing wage rules on school projects.
Codes and Standards | Mar 2, 2015
Proposed energy standard for data centers, telecom buildings open for public comment
The intent of ASHRAE Standard 90.4P is to create a performance-based approach that would be more flexible and accommodating of innovative change.
Codes and Standards | Feb 22, 2015
Louisiana officials critical of stricter building standards in flood-prone areas
Buildings would have to be built either two or three feet above the base flood elevation for a 100-year flood or above the base elevation for a 500-year flood.
Codes and Standards | Feb 18, 2015
Buildings with rocking steel-braced frames are advantageous in earthquakes
Research at Case Western Reserve University has found that buildings that rock during an earthquake and return to plumb would withstand seismic shaking better than structural designs commonly used today in vulnerable zones of California and elsewhere.
Codes and Standards | Feb 18, 2015
USGBC concerned about developers using LEED registration in marketing
LEED administrators are concerned about a small group of developers or project owners who tout their projects as “LEED pre-certified” and then fail to follow through with certification.
Codes and Standards | Feb 12, 2015
ASHRAE, USGBC, IES consider biomass requirements in green building standard
The proposal would add biomass to approved renewables.
Codes and Standards | Feb 12, 2015
New Appraisal Institute form aids in analysis of green commercial building features
The Institute’s Commercial Green and Energy Efficient Addendum offers a communication tool that lenders can use as part of the scope of work.
Codes and Standards | Feb 8, 2015
ASHRAE, IAQA approve consolidation
Under the consolidation, IAQA will become a part of the ASHRAE organization while maintaining its own brand and Board of Directors.
Codes and Standards | Feb 6, 2015
Obama executive order requires federal construction projects to consider flood damage caused by climate change
To meet the new standard, builders must build two feet above the currently projected elevation for 100-year floods for most projects.
