Roof Truss Wall Plate Detail

A truss frame consists of a roof truss and a floor truss joined by exterior wall studs.

Roof truss wall plate detail.

Wall plates and the roof structure shall be bedded and fixed to distribute and transmit loads and to prevent uplift. 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. Trussed rafter roofs and traditional cut roofs should be supported on timber wall plates. 4 storage trusses should be stored in a stable position to prevent toppling and or shifting.

Plate a horizontal wood framing member typically the top and bottom 2x4 members of a stud wall and the 2x6 sill plate bolted to a concrete wall for floor structural attachment. Toenail a truss into the top of the wall plate by nailing through the sides of the bottom chord at a 30 degree angle. Wall plates should generally be in lengths of not less than 3m but shorter lengths should extend over at least 3 joists rafters or trusses. The wide variety of possible roof and floor truss designs and combinations is illustrated by figure 1.

To fix the joists and rafters down on to the wall plates they should be toe or skew nailed to the top plate like below. I joist construction details performance rated i joists in floor and roof framing truss. Engineered roof trusses wi overhang roof apron gutter downspout system cont 2x8 rough fascia. Joist attachment per detail 1b load bearing wall above shall align vertically with the wall below.

1k 2x plate flush with inside face of wall or beam. In scotland 100mm x 25mm wall plates should be used in long lengths butt jointed. As with rafter style roofs toenailing is one of the most common ways of attaching a truss style roof to a wall plate. Metal plate connected wood trusses hib 91 by permission of truss plate institute inc.

However anchor bolt spacing must be reduced 24 in. Set out the ceiling joists onto the wall plates the ceiling joists are installed before the rafters as they will stop the roof spreading and also give something for you to lay planks across to stand on when building the roof. 610 mm maximum because the top plate is loaded in its weak direction. End walls may be truss framed with field assembled stud infill prefabricated in.

As an alternate to the roof truss anchor a bolted top plate may be used for the roof to wall connection see figure 5.