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
Contractors | Oct 6, 2022
Modular construction gets boost from impacts of the pandemic
The impact of the Covid pandemic on the construction industry appears to be fueling demand for modular construction methods, especially in the western U.S. and Canada.
Fire and Life Safety | Oct 4, 2022
Fire safety considerations for cantilevered buildings
Bold cantilevered designs are prevalent today, as developers and architects strive to maximize space, views, and natural light in buildings. Cantilevered structures, however, present a host of challenges for building teams, according to José R. Rivera, PE, Associate Principal and Director of Plumbing and Fire Protection with Lilker.
Resiliency | Sep 30, 2022
Designing buildings for wildfire defensibility
Wold Architects and Engineers' Senior Planner Ryan Downs, AIA, talks about how to make structures and communities more fire-resistant.
| Sep 30, 2022
Lab-grown bricks offer potential low-carbon building material
A team of students at the University of Waterloo in Canada have developed a process to grow bricks using bacteria.
| Sep 27, 2022
New Buildings Institute released the Existing Building Decarbonization Code
New Buildings Institute (NBI) has released the Existing Building Decarbonization Code.
| Sep 22, 2022
Gainesville, Fla., ordinance requires Home Energy Score during rental inspections
The city of Gainesville, Florida was recently recognized by the U.S. Dept. of Energy for an adopted ordinance that requires rental housing to receive a Home Energy Score during rental inspections.
| Sep 19, 2022
New York City construction site inspections, enforcement found ‘inadequate’
A new report by the New York State Comptroller found that New York City construction site inspections and regulation enforcement need improvement.
| Sep 16, 2022
Fairfax County, Va., considers impactful code change to reduce flood risk
Fairfax County, Va., in the Washington, D.C., metro region is considering a major code change to reduce the risk from floods.
| Sep 13, 2022
California building codes now allow high-rise mass-timber buildings
California recently enacted new building codes that allow for high-rise mass-timber buildings to be constructed in the state.
| Sep 8, 2022
U.S. construction costs expected to rise 14% year over year by close of 2022
Coldwell Banker Richard Ellis (CBRE) is forecasting a 14.1% year-on-year increase in U.S. construction costs by the close of 2022.
