Roof Surface Wind Speed Distributions on Low-rise Buildings

Wind loading on ridge, hip and perimeter roof tiles: A full-scale experimental study

“…The highest mean surface flow was recorded by CP-2 (which is installed on R1), and was around 55% higher than the approach flow. In a small-scale wind tunnel study conducted by Cochran et al (1999) on roof shingles, mean surface flows of up to 60% higher than the mean approach flow (measured at model eave height) were recorded. Probe CP-1, which was installed at the corner gable-end experienced mean roof speed factors of less than one for most wind directions.…”

“…it assumes the loading mechanism for wind to be the same for short and long duration gusts and that it varies with the square of the wind speed only. Peterka et al (1997) also evaluated an upper bound value of 2.5 for V s / V̅ a,h in one story buildings with shingled roofs, which was later confirmed to be conservative by Cochran et al (1999).…”