Brace Attic 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.

Brace attic trusses. Ceiling bracing this is only specified on our designs when no plasterboard is directly fixed to the underside of the trusses. Nail them to the rafters and angle nail the center support to the top edge of the horizontal brace. Section last after permanently bracing the rest of the trusses. Temporary bracing this is used to restrain the trusses during erection.

Use 1 by 4 inch boards called purlins as temporary braces for rafter trusses. The functions of roof bracing roof bracing performs three distinct functions. Without bracing it is almost impossible to install trusses. Many a carpenter has been killed or seriously injured when roof trusses suddenly collapse as they re erected.

Turn the truss upside down and place on corner on the roof surface. Install 2x4s at a 45 degree angle. Start several trusses in. Some bracing provides a way to put up the trusses evenly while holding them and other bracing supports them after they are put up.

This can be done by bracing from the floor deck as shown below. Alternatively start the first truss 8 to 12 ft. In from the gable end and brace it to the deck. Slide the rest of the truss up using a 2x4 as a ramp if necessary.

Cut any diagonal braces in the truss with a reciprocating saw. Cut the ends to the same angle you used for the pony wall studs. Wind can easily push them over without bracing. Nail these temporarily to the outside edges of the rafter sides starting with the third truss.

Use a t brace to support the truss vertically. Truss clusters for maximum strength this image shows a cluster of three trusses tied together. Nail braces vertically every 4 feet along the top and bottom of a gable truss. Then work away from the braced end filling in the open 8 to 12 ft.

Purlins 24 oc are typical along with the bottom bracing shown. Use a hammer to knock the bottom end loose. Trusses form the roof line on buildings and provide support for the lumber that holds shingles or other form of roof cover. Diagonal bracing is really important if you re working with roof trusses on that upcoming room addition.

Truss stability bracing this is permanent bracing which holds the trusses upright straight and prevents any out of plane buckling of the members. 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 a 2 by 4 to fit horizontally from rafter to rafter on each truss.