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 | May 22, 2015
U.S. House scuttles EPA plan to expand definition of waters in Clean Water Act
Construction industry officials said the rule would hamper developers, cost jobs.
Codes and Standards | May 22, 2015
First EPD covering PVC water and wastewater piping published
Benchmarks impacts of seven PVC pipe products across their life cycles.
Office Buildings | May 18, 2015
New ASHRAE standard offers test method to determine heat gain of office equipment
The standard will aid engineers in configuring cooling systems in office buildings.
Codes and Standards | May 7, 2015
Widespread damage from Nepal earthquake due to poor implementation of building code
Nepal’s code author says destruction was ‘inevitable.’
Codes and Standards | May 7, 2015
Lavish residential skyscrapers prompt concern over shadows
New York, San Francisco, Washington, D.C., and Boston among cities grappling with height regulations.
Codes and Standards | May 7, 2015
Several states moving to repeal prevailing wage laws
Anti-prevailing wage bills that apply to state-funded construction projects have been passed in West Virginia and Nevada. Similar laws could be passed in Indiana and Illinois.
Codes and Standards | May 7, 2015
New OSHA rule aimed at protecting construction workers in confined spaces
The agency says the rule will protect about 800 workers a year from serious injury.
Codes and Standards | May 1, 2015
Colorado House kills construction defects bill
The legislation would have made it harder for condo owners to sue builders.
Codes and Standards | May 1, 2015
New energy efficiency program, Tenant Star, gets OK from Congress
The voluntary program for commercial and government buildings is modeled after Energy Star.
Smart Buildings | May 1, 2015
FEMA to require states to evaluate risks posed by climate change
The aim is for states to do a better job planning for natural disasters they are likely to face in a warming world.