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
| Dec 13, 2011
Improved code requirements for attic ventilation
The Roof Assembly Ventilation Coalition (RAVC) participated in the development of the code.
| Dec 12, 2011
LEED-EB Outpaces LEED for New Construction
The U.S. Green Building Council’s (USGBC’s) LEED certifications for existing buildings standard is outpacing LEED for new buildings for the first time.
| Dec 12, 2011
Philadelphia Mayor Signs Order for Project Labor Agreements
Philadelphia Mayor Michael Nutter signed an executive order establishing project labor agreements for major public works projects in Philadelphia.
| Dec 12, 2011
Improved Code Requirements for Attic Ventilation
The International Code Council (ICC) recently published the 2012 International Residential Code (IRC) that includes improved code requirements for balanced intake and exhaust for ventilated attics.
| Dec 12, 2011
DOE makes 2010 ASHRAE energy standard the reference for state energy codes
The U.S. Department of Energy (DOE) issued a ruling that establishes the 2010 American Society of Heating, Refrigerating and Air-Conditioning Engineers’ (ASHRAE’s) 2010 energy efficiency standard as the commercial building reference standard for state building energy codes.
| Dec 1, 2011
Chinese cabinet approves regulation to prevent fraud in construction bidding
China’s State Council approved a regulation to standardize bidding processes for construction and other business-related projects in order to prevent fraud and misconduct.
| Dec 1, 2011
More stringent efficiency codes driving growth in green building industry
Thanks partly to upgraded building codes, the building energy efficiency market will soar more than 50% between now and 2017 to $103.5 billion, according to Pike Research.
| Dec 1, 2011
Safety tracking tool helping prevent injuries at World Trade Center site
Since putting in place their Safety Management Systems Tracking Tool three years ago, risk managers for the World Trade Center project in New York say they've seen workplace injuries, reported hazards, and workers compensation claims decline.
| Dec 1, 2011
OSHA releases new construction safety videos
OSHA released new safety videos to offer both employers and workers brief, easy-to-understand education about construction safety.
| Dec 1, 2011
GSA Region 5 BIM standards could set national agenda in government contracting
Learning how the GSA wants to work with contractors using Building Information Models (BIM) will dramatically improve your odds of winning federal work.