Attic Truss Bracing

Nail braces vertically every 4 feet along the top and bottom of a gable truss.

Attic truss bracing.

Temporary bracing this is used to restrain the trusses during erection. Lifting trusses higher than one story may require. However for an assembly of roof trusses buckling might occur in the same direction for every truss. Purlins 24 oc are typical along with the bottom bracing shown.

Use a t brace to support the truss vertically. 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. Turn the truss upside down and place on corner on the roof surface. The functions of roof bracing roof bracing performs three distinct functions.

Therefore bracing force accumulates along. 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. Some of these standard details may be sealed upon request. Bracing of trusses is extremely important.

Some bracing provides a way to put up the trusses evenly while holding them and other bracing supports them after they are put up. See product data sheet no 3 for more information. It is very important that the contractor or homeowner responsible for truss erection read through all documents inside the job packet. Without bracing it is almost impossible to install trusses.

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. Install 2x4s at a 45 degree angle. Certain conditions must be met before an attic truss can be built. Roof truss repair details.

For example using the 2 percent rule bracing force for a web member that must resist 4 000 pounds compression is only 80 pounds. Slide the rest of the truss up using a 2x4 as a ramp if necessary. Truss stability bracing this is permanent bracing which holds the trusses upright straight and prevents any out of plane buckling of the members. Timber roof trusses are engineered and.

View the following detail guides. 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. Trusses which are not braced or which are not braced correctly are subject to toppling over or collapse. Contact mitek engineering support for any questions.

Truss clusters for maximum strength this image shows a cluster of three trusses tied together.