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
Multifamily Housing | Jan 31, 2015
Production builders are still shying away from rental housing
Toll Brothers, Lennar, and Trumark are among a small group of production builders to engage in construction for rental customers.
| Jan 30, 2015
Investment in nonresidential structures expands in fourth quarter
Real gross domestic product expanded 2.6% during the fourth quarter of 2014, following a 5% increase in the third quarter.
Energy Efficiency | Jan 28, 2015
An urban wind and solar energy system that may actually work
The system was designed to take advantage of a building's air flow and generate energy even if its in the middle of a city.
Multifamily Housing | Jan 27, 2015
Multifamily construction, focused on rentals, expected to slow in the coming years
New-home purchases, which recovered strongly in 2014, indicate that homeownership might finally be making a comeback.
Office Buildings | Jan 27, 2015
London plans to build Foggo Associates' 'can of ham' building
The much delayed high-rise development at London’s 60-70 St. Mary Axe resembles a can of ham, and the project's architects are embracing the playful sobriquet.
Multifamily Housing | Jan 22, 2015
Sales of apartment buildings hit record high in 2014
Investors bet big time on demand for rental properties over homeownership in 2014, when sales of apartment buildings hit a record $110.1 billion, or nearly 15% higher than the previous year.
| Jan 21, 2015
From technician to rainmaker: Making the leap in your career
Many AEC firms focus on training for the hard skills of the profession, not so much for business prowess, writes BD+C's David Barista.
Modular Building | Jan 21, 2015
Chinese company 3D prints six-story multifamily building
The building components were prefabricated piece by piece using a printer that is 7 meters tall, 10 meters wide, and 40 meters long.
| Jan 21, 2015
Tesla Motors starts construction on $5 billion battery plant in Nevada
Tesla Motors’ “gigafactory,” a $5 billion project on 980 acres in Sparks, Nev., could annually produce enough power for 500,000 electric cars.
| Jan 20, 2015
Daring hotel design scheme takes the shape of cut amethyst stone
The Dutch practice NL Architects designed a proposal for a chain of hotels shaped like a rock cut in half to reveal a gemstone inside.
