Brace Attic Trusses

Purlins 24 oc are typical along with the bottom bracing shown.

Brace attic trusses.

Use a t brace to support the truss vertically. Bracing the second gable end is advisable. This can be done by bracing from the floor deck as shown below. 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.

Trusses form the roof line on buildings and provide support for the lumber that holds shingles or other form of roof cover. In from the gable end and brace it to the deck. Without bracing it is almost impossible to install trusses. Cut a 2 by 4 to fit horizontally from rafter to rafter on each truss.

Start several trusses in. Use a hammer to knock the bottom end loose. Then work away from the braced end filling in the open 8 to 12 ft. Section last after permanently bracing the rest of the trusses.

This is done by plumbing the truss and securing as described above for the first gable end. The remainder of the trusses should. Begin with the second gable end truss and work back towards the first gable end. Nail these temporarily to the outside edges of the rafter sides starting with the third truss.

It is best to brace the inside of the trusses before handling them. Cut any diagonal braces in the truss with a reciprocating saw. Truss stability bracing this is permanent bracing which holds the trusses upright straight and prevents any out of plane buckling of the members. Use 1 by 4 inch boards called purlins as temporary braces for rafter trusses.

Alternatively start the first truss 8 to 12 ft. Step 2 lift trusses onto roof. Truss clusters for maximum strength this image shows a cluster of three trusses tied together. Nail them to the rafters and angle nail the center support to the top edge of the horizontal brace.

Once the roof trusses are stacked into a place they can be positioned one at a time. Temporary bracing this is used to restrain the trusses during erection. 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. See product data sheet no 3 for more information.

Install 2x4s at a 45 degree angle. Some bracing provides a way to put up the trusses evenly while holding them and other bracing supports them after they are put up.