Trussed Rafter Types

Use this page to identify common truss rafter types. Please Contact us for details of our full range.

king post   fink
king post   fink

cantilever
 
fan
cantilever   fan

raised tie
 
mono 2/1
raised tie   mono 2/1

mono 2/2
 
mono 3/2
mono 2/2
 
mono 3/2

queen post
 
howe
queen post   howe

double w
 
bobtail/stub end
double w   bobtail / stub end

flat top (hip end)
 
scissor
flat top (hp end)   scissor

attic
 
parallel
attic   parallel

Technical Data

Design
Trusses are designed in accordance with BS5268: Part 3 & the relevant Building Regulations.

Pitches
For economy, pitches are standardised to between 15 & 40 degrees - we can supply to your spec.

Spacing
The usual spacing is 600mm (450mm or 400mm to support heavier loads).

Preservation
We treat with new waterborne solutions, or with non-corrosive, spirit-based organic solvents.

Spans
Standard trusses can be designed up to 11 metres in 35mm timber, and 15 metres in 47mm timber. Wider spans are supplied as multiple trusses fixed together.

Eaves
Overhang Any overhang can be supplied. NB Very large overhangs may cause the trusses to be uneconomical.

Timber
We use kiln dried and stress graded timber to European and British Standards.

Nailplates
We use and recommend Wolf 101 nailplates manufactured from structural grade galvanised mild steel to BS EN 10326 Fe E 280 GZ275. 1mm thick.

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