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Guide to Setting Out & Dimensioning

As outlined in BS.5268-3, in order to ensure that trussed rafters are correctly designed and fabricated and that they are suitable for their intended purpose
it is necessary for them to be accurately specified and for adequate information to be available when required.
At MiTek we have developed a number of standard trussed rafter configurations, as shown in figure 4, to which dimensions can be related, this simplifies the specification for design purposes.

Overhang                              O 
Span over ceiling tie               SC   
Room width                           RW
Span over setting out points    SOP
Cantilever                              C
Room height                              RH
Span over wallplates             
Nib SL Slope length                     N