Roof Tie Down Requirements

Roof anchors can be as simple as a d ring connection or as complex as a complete lifeline system.

Roof tie down requirements.

Tie down details for repair of storm damaged roofs in south east queensland page 2 of 13. Anchor points are usually installed on the roof and are used to connect lanyards lifelines and other forms of tie off which prevent a worker from falling. Rafter or truss uplift connection forces from wind asd pounds per connection a b c d e f g h. Batten fixings should comply with the tie down requirements specified in as 1684 2 fixings for 45mm deep timber battens should be 1 x 75mm long no.

Roof truss tie down this guide provides information relating to the fact that as 4440 does not specify tie down requirements and therefore reference should be made to as 1684 parts 2 and 3. Longer screws may be required in n3 and n4 sites for some batten and rafter spacings. This section contains the following resource. Hvac hold down brackets are used to secure an hvac rooftop to a roof curb.

0 5 g acceleration in the rearward direction. Repairing storm damaged roofs tie down designs for tile and sheet roofs conforms to wind classifications of up to category n3 previously w41n designed to withstand a maximum gust wind speeds of 50 metres per second. These include the minimal nominal fixings for roof trusses where there is no net uplift. Both permanent and temporary roof anchor points are available.

For pitched coupled roofs where there is net uplift that cannot be resisted by nominal nailing alone the code requires specific tie down fixings be installed. The uplift connection forces are based on a maximum 33 foot mean roof height and wind exposure category b or c. This section contains the following resource. 0 8 g deceleration in the forward direction.

Wind certification requires a professional engineer s pe stamp of approval to verify a hvac rooftop unit can safely withstand high wind gusts sustained winds or storms without separating from the roof curb or the roof curb separating from the roof. Depending on the roof design and the roof rafter spacing. As 1684 2 clause 9 6 1 states that continuity of tie down shall be provided from the roof sheeting to the foundations. 0 5 g acceleration in a lateral direction.

Building codes such as the icc s 2012 international building code section 2308 10 roof and ceiling framing typically specify that where rafter ties are used they are required at intervals ranging from 12 to 24 o c.