Landscape & Urban Design Issue 50 2021 | Page 9

GARDEN DESIGN
Fabrics that are certified to UV standard 801 offer true protection levels against ultraviolet radiation , with more premium materials offering a minimum 95 % UV block ( the equivalent to SPF 40 ), guaranteeing protection to both the skin as well as any soft furnishings . To ensure a cooling effect , the fabric should be measured according to the heat and light that passes through it . Materials that filter 70 % of solar heat can reduce interior room temperatures by more than 10 ° C , even on the hottest of days .
Folding arms
The retractable folding arms on any patio awning must be able to withstand strong breezes and sudden gusts . Pressure die cast or drop forged joints on the elbows of folding arms offer the highest wind loading capabilities , with Beaufort 5 ( 24mph wind ) as standard certification and Beaufort 6 ( 30mph ) offering the highest wind resistance rating .
Springs should be tensioned via stainless steel cables ( intertwined stranded cables won ’ t tear or break ) and looped around the elbow to ensure a crisp taut fabric at every position , allowing rainwater to run off the material . Fitting the springs and cables with sheathes will reduce friction and noise from the vibrations when it ’ s windy , as well as result in a clean and finished look . For optimum tension , arms with twin springs kept under tension via two steel cables is recommended , and four steel cables for deeper projections .
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