The creators of the original wind-rated Roll-A-Door are helping builders, developers and home owners comply with the requirements for doors, which are similar to the requirements that apply to all other building products used in cyclone prone areas.
B&D Doors & Openers Australia provides a variety of wind-resistant garage doors fully tested and certified to meet the revised Australian Standards.
The revised Australian Standard AS/NZS 4505:2012 'Garage doors and other large access doors' is now referenced in the National Construction Code (NCC) 2013 - Housing Provisions (Building Code of Australia Volume Two) for Wind Regions C and D, which experience wind speeds of up to 266 and 310km/h respectively. This came into effect on May 1 2013.
Garage doors sold in Regions C and D are now required to be tested, certified and supplied with a sticker with information including the door's design pressure.
To ensure that its products comply with the revised standards, B&D Doors has worked with the James Cook University Cyclone Testing Station (CTS) to assess and assist certification the performance of its products.
The CTS was founded after the devastation caused by cyclones Althea and Tracy in the early 1970s. It is an independent facility with a wide range of expertise to conduct research, testing and community education aimed at minimising suffering and loss from building damage in high wind events.
CTS development manager Graeme Stark said that the inclusion of the revised standards in regulation had been necessary to ensure that garage doors are of the same standard as the buildings they are attached to.
"Damage investigations of buildings affected by cyclones have shown that garage doors have under-performed other parts of buildings," he said.
"During Cyclone Yasi in 2011, around 29 per cent of houses experienced garage door failures, and that figure should be much lower.
"If a garage door fails prematurely, the damage to the building, contents and surrounding property can be far more expensive than the door itself and can also endanger lives," he said.
CTS uses test loads based on the cyclonic wind pressures detailed in the Australian wind load standard (AS/NZS 1170.2) and uses testing rigs which place around 1000 cycles of force on doors to replicate loads generated in cyclones.
There are many factors that affect the wind pressures a door has to withstand, including the design of the building, the location (including the roughness and slope of the terrain), any shielding from other similar buildings and the direction that the door faces. Fortunately this assessment is done for the whole building, so the site wind classification simply needs to be specified when ordering your new door.
Many B&D garage doors have been tested and certified to meet the revised standard, including the innovative Windpanel sectional door, windlocked Roll-A-Doors and a range of Roll-A-Shutter products.
The B&D Windpanel derives its additional strength by reinforcing the door structure and providing an additional bracing system, which can be manually applied to a door when a cyclone appears imminent.
The brace design uniquely protects against garage door blow-in and blow-out, via a hinge system that connects the door to the high-wind brace using a deflection bracket.