Lateral Restraint Roof

Restraint straps and banding types and application.

Lateral restraint roof.

Permanent bracing and continuous lateral restraint is sometimes required within trussed systems to provide long term stability and or lateral force resistance. Lateral restraint straps should. Lateral restraint straps should be fixed to the roof structure by either. Lateral restraint repair systems a remedial repair strategy to provide lateral restraint may typically include connecting or reconnecting floor and ceiling joists together with roof members to masonry walls.

Lateral restraint straps are required at floor rafter or flat roof member levels and in pitched roofs at ceiling joist levels. Where floors joists rafters and flat roof trusses are built in or supported by hangers off the wall its required to use lateral restraint by tension straps in accordance with the provisions in bs en 1996 2 2006 and building regulation requirements. Protectahome specialist building services 5 subscribers. Even the friction between the sides of floor joists in a wall and the masonry can help reduce sideways movement.

Fixing to solid noggings using a minimum of four 50mm x 4mm steel screws or four 75mm x 4mm 8swg round nails with one fixing in the third rafter figure 1 or. Vertical loads down through the wall imposed by the roof and internal floors plays a positive role. The method approximates a bay of z sections as a single degree of freedom system and uses a stiffness formulation to determine the contribution of the different components in the system to the resistance of lateral movement. The component stiffness method is a method to predict lateral restraint forces in roof systems supported by z sections.

Restraints are only required at ceiling level where the height from the top floor level and the roof height is 16 times plus 10mm the thickness of the wall that is being restrained. Lateral restraint to gable walls should be provided at rafter level at all times.