Attic Truss Bracing Details

Roof truss repair details.

Attic truss bracing details.

An attic trussis a type of roof truss with an open space at its bottom center to accommodate a living space with webbing above and on either side of this living space. Purlins 24 oc are typical along with the bottom bracing shown. 7 2 9 bracing for trussed rafter roofs trussed rafters shall be suitably braced to support applied loads and self weight without undue movement. In order to create an attic truss certain conditions must be met in the plan.

Bracing of trusses is extremely important. In the absence of a designed temporary bracing plan bcsi is the industry guideline for the generalized implementation of temporary bracing that framers must follow. Some truss manufacturers will also note basic details of bracing such as bracing size 1x4 2x4 and even nailing to webs. Smaller structures that are sheathed in metal or osb require less bracing assuming proper truss connection details are used.

Plumb cuttop chord end cut to provide for vertical plumb installation to fascia face trim board. It is very important that the contractor or homeowner responsible for truss erection read through all documents inside the job packet. Trusses which are not braced or which are not braced correctly are subject to toppling over or collapse. 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.

Flat coastal fringes fens airfields and moorland. As spans increase bracing becomes even more critical. 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. Contact mitek engineering support for any questions.

View the following detail guides. Plenum typically the use of the entire floor truss cavity formed by the floor above and the ceiling below as a supply or return air duct. Temporary bracing is a means and methods issue and is the responsibility of the contractor in accordance with the construction documents or the truss submittal package. Some of these standard details may be sealed upon request.

Plumb risevertical overall measurements at the end of a truss where the top and bottom chords meet. Truss stability bracing this is permanent bracing which holds the trusses upright straight and prevents any out of plane buckling of the members.