Pitched Trusses ~ these can be constructed with a symmetrical
outline (as shown on pages 562 to 563) or with an asymmetrical
outline (Northlight † see detail below). They are usually made from
standard steel sections with shop welded or bolted connections,
alternatively they can be fabricated using timber members joined
together with bolts and timber connectors or formed as a precast
concrete portal frame.Long Span Roofs