Roof Tie Down Example

To learn more about tie down straps see our article on the basics of tie down straps.

Roof tie down example.

To attach the fixture to the roof shingles simply spread a generous glob of rtv adhesive over an area of about 2 1 2 inches in diameter. Tie and sheet roofs wind classification to n3 maximum design gust wind speed 50m s old w41n assessment of damage to framing. 1 inch 25 4 mm 1 foot 304 8 mm 1 mile per hour 0 447 m s 1 pound 0 454 kg 1 pound per square foot 47 9 n m 2 1 plf 14 6 n m. Rafter or truss uplift connection forces from wind asd pounds per connection a b c d e f g h.

Wind uplift forces increase in proportion to the square of the velocity of the wind so for example a site with a wind velocity of 61m s c2 will have 50 higher uplift forces than a 50m s c1 site. Getting every required tie down connection right is critical as failure of one link in the tie. This is because the wind uplift forces are greater than the weight of the roof and the tie down fixings are in some cases not strong enough to resist the uplift effect. Be sure to smooth off the corners and the edges to avoid damaging the cables or yourself.

Tie down details for repair of storm. Damaged roofs in south east queensland. Roof types require specific tie down. One hole measures 1 4 in diameter and the other hole measures 3 8 in diameter.

They are available in a variety of lengths widths strength ratings hook ends and secure methods.