Attic Wind Braces

Air vent airhawk 12 in aluminum externally braced roof turbine vent.

Attic wind braces. Wind bracing keeps the roof trusses upright and square to the roof basically they stop the roof from being blown down when its being constructed but more importantly when its tiled. Item 863694 model tob12sbr. An important notation is that the purlin bracing should be off of walls or beams as needed. Special framed shear walls are becoming more common to help buildings meet the requirements of earthquake engineering and wind engineering.

The roof is subject to pressure placed on it by natural forces including snow rain and wind. First it takes some of the sag deflection out which must not exceed the allowable limit. Get up into the attic and nail or screw a pair of 2x4s in an x pattern one extending from the peak of the gable to the bottom center brace of the fourth truss and the other from the bottom center of the gable to the top center brace of the fourth truss. 7 2 9 bracing for trussed rafter roofs trussed rafters shall be suitably braced to support applied loads and self weight without undue movement.

If its a truss roof then wind bracing is important when they design the roof they also design a wind bracing plan so the wind braces are positioned correctly. In medieval roofs they are arched and run from the principal rafters to catch the purlins. If the wind load is high enough and the vertical studs are long enough the frame may also require a brace to prevent it from rotating the frame and or buckling the verticals see figure 1. Second it helps to straighten the roof plane if done properly.

For the purposes of this chapter the guidance and use of standard trussed rafter bracing does not apply to homes on or near exposed sites e g. Purlins as shown in sample photos below are installed for rafter support. They are usually placed as close as practical to the center of rafter. Flat coastal fringes fens airfields and moorland.

Over time these forces can cause the roof to begin to sag eventually leading the roof to fail if not. Diagonal bracing remains a vital interior part of many roof systems and in wall wind braces are required by building codes in many municipalities or by individual state laws in the united states.