Wind Load Charts
In this section you will find information regarding wind loads and sheet
deflection that should be taken into account when designing a covering. Use
of the graph indicators is quick and easy, and is intended to provide information
of a type generally acceptable in civil engineering. Each chart provides
data for 3 different sheet widths with the maximum proportional deflection
being 1:20 or 5% of the specific width.
The right-hand area, where the curves become more horizontal, measures
specifically and only sheets clamped at 2 sides.
The left-hand area measures specifically sheets glazed in frames with supports
perpendicular to the sheet ribs.
For structures built in areas with variance in meteorological conditions,
the use of adequate safety factors is recommended in order to reduce risks.
Polygal states that this data and information in this section is given
in good faith but only as basic technical support for engineers of various
structures. In no way can this information be substituted for the responsibility
and liability of the designing engineer of a structure as determined by law.
The information pertains to the roofing material only and does not in any
way determine the strengths required in a supporting structure or in various