Attic Wind Braces

Learn the science and math of roof framing.

Attic wind braces.

There should be a minimum of four diagonal rafter braces in each roof. Hip roofs in which all four sides slope toward a central ridgeline are naturally more wind resistant than gable roofs. Applicable to all trussed rafter roofs unless rigid sarking such as timber boarding or plywood is used. Wind or wall bracing this bracing is installed in the roof in addition to the truss stability bracing and its purpose is to stabilise the gable walls under the action of wind loading.

Homeowners cannot take chances with the structural integrity of their roofs. In medieval roofs they are arched and run from the principal rafters to catch the purlins. Product data sheet sheet no 5 may 2007 fig 1 the elements of bracing room in the roof trussed rafters. My book the roof framers field manual tells all.

Bracing must be installed off of walls or beams. Stack exchange network stack exchange network consists of 176 q a communities including stack overflow the largest most trusted online community for developers to learn share their knowledge. Larger joist framing materials for instance 2x10 or 2x12 s can be doubled or tripled up with plywood in between and glued to create a flush. One way to strengthen a gable roof is to brace the end walls which are the most vulnerable to uplift.

The roof is subject to pressure placed on it by natural forces including snow rain. Submitted by ray thornburg on tue 06 04 2013 20 10. Click the links to go to my buy it now page. How to brace rafters in an attic.

In the attic there are two 2x4 angle braces one at each gable end that connect from the ceiling joist gable end to the ridge board mid span. 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. It braces a roof laterally and diagonally. Bracing purlin braces or any other roof braces ridge braces hip rafter bracing along with valley bracing must not be supported off the ceiling joists.

If wind bracing is only temporary support whilst a truss roof is being put up then tell me what stops the roof blowing.