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
| Mar 19, 2014
How to develop a healthcare capital project using a 'true north charter'
Because healthcare projects take years to implement, developing a true north charter is essential for keeping the entire team on track and moving in the right direction.
| Mar 18, 2014
How your AEC firm can win more healthcare projects
Cutthroat competition and the vagaries of the Affordable Healthcare Act are making capital planning a more daunting task than ever. Our experts provide inside advice on how AEC firms can secure more work from hospital systems.
| Mar 17, 2014
Coin toss decides who gets $4.4 million construction contract
When two builders submitted identical bids for the Gretna (La.) Police Headquarters, the city council decided to choose the winner through a coin toss.
| Mar 17, 2014
Rem Koolhaas explains China's plans for its 'ghost cities'
China's goal, according to Koolhaas, is to de-incentivize migration into already overcrowded cities.
| Mar 13, 2014
Austria's tallest tower shimmers with striking 'folded façade' [slideshow]
The 58-story DC Tower 1 is the first of two high-rises designed by Dominique Perrault Architecture for Vienna's skyline.
| Mar 12, 2014
London grows up: 236 tall buildings to be added to skyline in coming decade, says think tank
The vast majority of high-rise projects in the works are residential towers, which could help tackle the city's housing crisis, according to a new report by New London Architecture.
| Mar 12, 2014
14 new ideas for doors and door hardware
From a high-tech classroom lockdown system to an impact-resistant wide-stile door line, BD+C editors present a collection of door and door hardware innovations.
| Mar 10, 2014
Field tested: Caterpillar’s Cat B15 rugged smartphone
The B15 is billed by Cat as “the most progressive, durable and rugged device available on the market today.”
| Mar 10, 2014
5 rugged mobile devices geared for construction pros
BD+C readers share their most trusted smartphone and tablet cases. The editors select some of their faves, too.
| Mar 6, 2014
Must see: Tour Seinfeld's apartment with virtual reality headset
Fans of the show can now explore a virtual 3D model of the iconic New York residence, thanks to one Web designer's painstaking effort.
