Roof structures: trusses and cut roofs
Trussed roofs are erected to the truss designer's layout, at the specified centres, with diagonal and longitudinal bracing, binders, gable ladder framing and restraint straps to walls and gables. Wall plates are bedded level and strapped down. Cut roofs, often the answer on extensions, dormers and roofs that have to marry into an existing structure - need rafters, purlins, ridge, hips, valleys and ceiling ties sized and supported to the engineer's design. Both need ventilation paths kept clear at eaves and ridge, insulation continuity thought about, and trimming around chimneys and rooflights done properly rather than improvised.

