Roof Lateral Restraint Straps

Our surveyors are seeing more and more instances where lateral restraint straps to the head of gable walls are being applied at spacing greater than the maximum permitted 2m.

Roof lateral restraint straps.

Longitudinal braces that are present to provide stability to a trussed rafter roof can also be used for restraint of the wall but additional braces will usually be needed to achieve the required spacing. Roof taking shape now. This weekend it will be mostly finding top of joists with 235mm tek screws. Only trouble is joists are hiding behind 150mm insulation and two layers of 18mm osb3 t g.

For some time it has been relatively common practice for builders to fix wall lateral restraint straps lrs at roof level to the trussed rafter longitudinal bracing members although the details often used by builders do not accord with guidance offered in building regulations nhbc standards or other authoritative documents. Lateral restraint to gable walls should be provided at rafter level at all times. How to use lateral restraints during construction separating walls. Longer lengths avaialble to order.

I will ignore side restraints and strap down joists ends with twisted straps. Fixing to longitudinal bracing members using eight 25mm x 4mm steel screws evenly distributed along. All common sizes in stock from 500 to 2000mm long 100mm increments. In this case packing the rafters either side of the wall tight to the masonry on both sides will be.

The masonry walls would also benefit from the lateral restraint by restricting movement of the separating walls and gable walls. Heavy restraint straps meet requirements for lateral restraint of roof trusses rafters and joists tied into masonry walls. Restraint straps should be provided to one side of the wall only unless the design shows that strapping to both sides is required. Few misses and there will be no need for roof light.

Enjoy watching and keep yours eyes peeled. Light restraint straps are designed for vertical loads such as wall plates on top of masonry walls. Simpson strong tie restraint strap flat 5mm x 30mm x 1200mm pack of 20 877345. Simpsons strong tie restraint strap flat 2 5mm x 30mm x 1000mm pack 20 970491.

Vat add to basket. Fixing to solid noggings using a minimum of four 50mm x 4mm steel screws or four 75mm x 4mm 8swg round nails with one. Paul cribbens nhbc standards manager house building standards discusses the fixing of wall lateral restraint straps to trussed rafter roofs. Even if you are using pre fabricated roof trusses part a of the building regulations and bs8103 remain clear that tensions straps should be no more than 2m apart.