Attic Truss Bracing

Lifting trusses higher than one story may require.

Attic truss bracing. Diagonal and chevron bracing should pass across each rafter in the roof however small gaps such as two trussed rafters between sets of bracing or one trussed rafter adjacent to gable or separating walls is permitted in the middle of an otherwise fully braced roof. Some of these standard details may be sealed upon request. Temporary bracing this is used to restrain the trusses during erection. Nail braces vertically every 4 feet along the top and bottom of a gable truss.

For example using the 2 percent rule bracing force for a web member that must resist 4 000 pounds compression is only 80 pounds. Section 1 scope and general. Roof truss repair details. The functions of roof bracing roof bracing performs three distinct functions.

3 6 erection bracing and tolerances section 4 roof bracing 4 1 general 4 2 battens 4 3 top chords 4 4 bottom chords 4 5 webs 4 6 top hat construction section 5 truss connections 5 1 hip ends 5 2 girder 5 3 gable end trusses 5 4 valleys 5 5 overhangs. Without bracing it is almost impossible to install trusses. It is very important that the contractor or homeowner responsible for truss erection read through all documents inside the job packet. Truss stability bracing this is permanent bracing which holds the trusses upright straight and prevents any out of plane buckling of the members.

Bracing of trusses is extremely important. The structure should be sufficiently wide to allow for a loft and attic spaces the loft area must be on a living floor and have attic rooms on both sides separated by knee walls a flat ceiling in the loft area and a floor below steep enough roof pitch to provide appropriate ceiling height for the loft area. Therefore bracing force accumulates along. See product data sheet no 3 for more information.

Certain conditions must be met before an attic truss can be built. Turn the truss upside down and place on corner on the roof surface. Trusses which are not braced or which are not braced correctly are subject to toppling over or collapse. Slide the rest of the truss up using a 2x4 as a ramp if necessary.

Trusses form the roof line on buildings and provide support for the lumber that holds shingles or other form of roof cover. Use a t brace to support the truss vertically. Purlins 24 oc are typical along with the bottom bracing shown. To strengthen the roof system truss clustering cross bracing and wind bracing is recommended at both end of the buildings and every 20 for longer span buildings.

Contact mitek engineering support for any questions. Some bracing provides a way to put up the trusses evenly while holding them and other bracing supports them after they are put up. Bracing force for an individual roof truss tends to be quite small. Install 2x4s at a 45 degree angle.

View the following detail guides.