Bowed Lattice Truss Details ~
Bowstring ~
steel or softwood fishplate (x2)
laminated bow (x2)
bracket or block
strut
bows
ties
steel heel
plate
bolt and split
ring connection
laminated
tie (x2)
centre tie
packing
between bows
Belfast ~
purlin bows (2)
strings (2)
plywood gusset
packing
steel
angle
lattice bracing
sheet
decking
Typical softwood timber dimensions ~
Span (m) 6 12 18 24
Bow¾2 (mm) (^38) ¾ (^2063) ¾ (^2575) ¾ (^3275) ¾ 50
String¾2 (mm) (^125) ¾ (^20200) ¾ (^25250) ¾ (^32300) ¾ 50
Lattices (mm) (^75) ¾ (^2075) ¾ (^25100) ¾ (^25125) ¾ 25
Long Span Roofs