Roof Tie Downs

Design Engineering has experience providing engineering designs and drawings for roof tie downs that are essential to stabilise buildings and homes during high winds. The design gust wind speed and corresponding wind classification is determined by one of our highly qualified structural engineers, to ensure the level of support needed by the tie down.


Following a site inspection to ensure no modifications or other factors that can’t be seen in your plans won’t impede the support and tie downs, one of our structural engineers will create a plan for you. Working to an international quality management standard (ISO 9001-2015), we are able to offer our services with the highest level of quality control which can be difficult to find elsewhere. All engineering drawings and calculations are checked in-house by our highly qualified and experienced team to ensure all quality procedures are adhered to.

Roof Tie Downs Designs and Drawings

Common Issues with Roof Tie Downs in Perth

Tie-downs are strap and anchor systems used to stabilise buildings and dwellings in heavy winds. Even at low wind speed categories, sheet-roofed homes will experience net wind uplift forces that must be held down using appropriate tie-down connections. As site wind categories rise, all roof types require specialised tie-downs.

A sufficiently skilled structural engineer determines the design gust wind speed and wind classification, taking into account terrain category, building height, and topographic and shielding effects. The recommended technique for designing the structural wood framework is to first define the preliminary position and extent of bracing and tie-down, then the basic frame layout in relation to the floor plan, and finally the proposed method of frame construction.

When deciding on a basic frame layout, bracing and tie-down requirements should be considered as well. The Building Commission of Western Australia published the conclusions of a report aimed at determining if tie-down rules are correctly enforced in Western Australia. The results for satisfactory construction varied across various assessment locations, ranging from very poor (11% corrosion protection) to moderate (63%) for battens properly fastened down within 1200 mm of the roof’s edge. If homeowners have issues about a specific roof, they should address them directly with their designer.

Please send through your enquiry today via email to info@designeng.com.au and we will call you to discuss your project.