1 general 1 1 definitions.
Wind scouring roof.
Thoughts on roof moss control.
Bre is a building science centre that generates new knowledge through research.
Wind damage to a roof especially a commercial roof can be just as damaging as if not more damaging than damage caused by hail.
The side of the building that s facing the wind.
The actual uplift pressures experienced on green roofs is significantly lower than on any conventional paver covered surfaces.
Is alone in the green roof industry with regard to its policy of routinely installing permanent wind erosion mesh within 2 m 6 5 ft of roof margins with low parapets.
Wind forces a building is an obstruction to wind flow and causes a.
The upward acting pressure on a roof s components resulting from wind traveling across the roof.
In 2004 this green roof withstood hurricane charlie a category 4 hurricane with winds ranging from 131 mph to 155 mph and hurricane jeanne a strong category 1 or weak category 2 hurricane with winds of 75 mph to 95 mph.
The side of the building that s sheltered from the wind.
Living in the temperate rainforest of the pacific northwest i sometimes get the feeling that if humans ever took even a temporary respite from the region the tenacious blackberry vines and fecund cedar and fir trees would take back what was once theirs and leave us all rooting about to find our street address in the matter of a few seasons.
Wind speed is based on data available from the storm analyses and not from roof top measurements.
Refer to the glossary for further definitions of key terms used in this manual.
In general snow accumulates on a roof with greater concentration near the eaves and valleys due to wind scouring.
The majority of the snow load is carried on the bottom half of the roof due to heat loss wind sun exposure and gravity exact placement of snow guards is a mixture of art and science haddock adds.
Thunderstorms wind storms hail storms and even tornadoes can all cause wind damage to your property and even high winds can wreak havoc on unsecured structures or rooftops causing roof leaks and other potentially catastrophic roof damage.
Plant nourishment and support.
Protection of underlying waterproofing systems.
The engineered medium must be carefully designed to provide for excellent plant growth no wind scouring and proper water holding capacity.
Vegetative roof assemblies must protect the underlying waterproofing system from human activities including the impact of.
Terms you should know.
Damaging winds defined as winds exceeding 50 60 mph account for half of all severe weather reports in the lower 48 states.
Gives a method of estimating the threshold wind speeds for scour on roof ballasts.
Csa standard the standard means the csa standard a123 21 standard test method for the dynamic wind uplift resistance of membrane roofing systems latest edition.
Ballast when used in this manual refers to a material used for securing the roof assembly.
