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 | Nov 9, 2016
Louisiana flood projections require urgent action, officials say
The 'no net loss’ prediction now seems unrealistic.
Codes and Standards | Nov 8, 2016
American Concrete Institute offers new guide for repair of concrete buildings
The guide provides assistance on assessment and rehab.
Codes and Standards | Nov 7, 2016
The AISC prequalified seismic moment connection standard is now available
You can download the 2016 version for free.
Codes and Standards | Nov 4, 2016
Obama Administration makes a push for denser, more affordable cities
The administration calls for zoning code changes and other measures to create more housing.
Codes and Standards | Nov 3, 2016
OSHA proposes safety standards changes to reduce employer costs
The changes include clarification on excavation standard and reporting job-related hearing loss.
Codes and Standards | Nov 2, 2016
New resources available to reduce plug loads using advanced power strips
A tenant education program can boost efficiency in office buildings.
Codes and Standards | Oct 26, 2016
Design industry lagging in meeting AIA 2030 Commitment goals, says AIA
Only 4% of projects have met the 70% energy savings target.
Codes and Standards | Oct 25, 2016
Concerns over megaquake in Oregon provoke debate over school building standards
According to advocates, communities should consider increased resiliency.
Codes and Standards | Oct 24, 2016
Building energy codes projected to save $126 billion in energy costs from 2010-2040
Commercial and residential structures are both included in the total.
Codes and Standards | Oct 24, 2016
Fall hazards, hazard communication lead 2016 OSHA top violations
The 2016 list bears a strong resemblance to the 2015 list.
