Spans in excess of these can be designed but are often supplied as multiple trusses fixed together.
Roof truss wall plate detail.
Joist attachment per detail 1b load bearing wall above shall align vertically with the wall below.
As with rafter style roofs toenailing is one of the most common ways of attaching a truss style roof to a wall plate.
End walls may be truss framed with field assembled stud infill prefabricated in.
Each part explained in detail.
In scotland 100mm x 25mm wall plates should be used in long lengths butt jointed.
610 mm maximum because the top plate is loaded in its weak direction.
Engineered roof trusses wi overhang roof apron gutter downspout system cont 2x8 rough fascia.
As an alternate to the roof truss anchor a bolted top plate may be used for the roof to wall connection see figure 5.
Pitches it is more economical to standardise the range of pitches between 15 40 degrees however trusses may be supplied outside this range.
Wall plates should be joined using half lapped joints at corners and in running lengths.
Metal plate connected wood trusses hib 91 by permission of truss plate institute inc.
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.
Toenail a truss into the top of the wall plate by nailing through the sides of the bottom chord at a 30 degree angle.
If the truss bundle is to be stored for more.
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 roof truss structure and design is integral to roof structural integrity and shape.
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.
If trusses are stored horizontally the blocking should be eight to ten foot centers to prevent lateral bending.
4 storage trusses should be stored in a stable position to prevent toppling and or shifting.
The wide variety of possible roof and floor truss designs and combinations is illustrated by figure 1.
I joist construction details performance rated i joists in floor and roof framing truss.
1k 2x plate flush with inside face of wall or beam.
Standard trusses can be designed up to 11 metres in 35mm timber and 15 metres in 47mm timber.
