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
School Construction | Mar 28, 2016
National report on school buildings reports $46 billion annual funding shortfall
Millions of students said to be learning in obsolete facilities.
Codes and Standards | Mar 25, 2016
ASHRAE grants fund human thermal comfort database project
Aim is to help better understand thermal comfort in residential and commercial buildings.
Codes and Standards | Mar 25, 2016
OSHA finalizes new silica dust regulations
Construction industry has until June 2017 to comply.
Wood | Mar 23, 2016
APA updates Engineered Wood Construction Guide
Provides recommendations on engineered wood construction systems.
Codes and Standards | Mar 23, 2016
Affordable housing advocates differ on micro-apartment policy
New York’s luxury micro units could be first step to developing affordable units.
Codes and Standards | Mar 21, 2016
GRESB launches Health and Well-being Module for real estate industry
Optional supplement to environmental, social, and governance assessment.
Codes and Standards | Mar 4, 2016
U.S. Supreme Court lets San Jose affordable housing law stand
Law attempts to alleviate Silicon Valley’s high housing costs.
Codes and Standards | Mar 2, 2016
WELL standard offers multiple benefits for owners, says real estate executive
Could be a recruiting tool for occupant companies.
Cultural Facilities | Mar 1, 2016
China bans ‘weird’ public architecture, gated communities
Directs designers of public buildings to focus on functionality.
Energy Efficiency | Feb 23, 2016
Economists, energy efficiency practitioners need to work together for better cost/benefit studies
Flawed energy efficiency research yields misleading, confusing results.
