Brace Attic Trusses

Temporary bracing this is used to restrain the trusses during erection.

Brace attic trusses.

Turn the truss upside down and place on corner on the roof surface. Alternatively start the first truss 8 to 12 ft. Many a carpenter has been killed or seriously injured when roof trusses suddenly collapse as they re erected. Diagonal bracing is really important if you re working with roof trusses on that upcoming room addition.

Without bracing it is almost impossible to install trusses. Chevron bracing on occasions where this type of bracing is needed it usually covers a minimum of three truss webs half way to the apex of the truss at approximately a 45 degree angle. Cut any diagonal braces in the truss with a reciprocating saw. Install 2x4s at a 45 degree angle.

Start several trusses in. Section last after permanently bracing the rest of the trusses. Brace other rafters as they are installed down the roof by nailing temporary 2 by 4 supports to rafter edges and to roof joists if rafters are being installed separately. Trusses form the roof line on buildings and provide support for the lumber that holds shingles or other form of roof cover.

Purlins 24 oc are typical along with the bottom bracing shown. Truss stability bracing this is permanent bracing which holds the trusses upright straight and prevents any out of plane buckling of the members. Some bracing provides a way to put up the trusses evenly while holding them and other bracing supports them after they are put up. Nail these temporarily to the outside edges of the rafter sides starting with the third truss.

In from the gable end and brace it to the deck. Nail them to the rafters and angle nail the center support to the top edge of the horizontal brace. Cut the ends to the same angle you used for the pony wall studs. Cut a 2 by 4 to fit horizontally from rafter to rafter on each truss.

Use a hammer to knock the bottom end loose. Slide the rest of the truss up using a 2x4 as a ramp if necessary. Use a t brace to support the truss vertically. 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.

Use 1 by 4 inch boards called purlins as temporary braces for rafter trusses. Truss clusters for maximum strength this image shows a cluster of three trusses tied together. The functions of roof bracing roof bracing performs three distinct functions. See product data sheet no 3 for more information.

Nail braces vertically every 4 feet along the top and bottom of a gable truss. This can be done by bracing from the floor deck as shown below. Ceiling bracing this is only specified on our designs when no plasterboard is directly fixed to the underside of the trusses.