Quality.

    Fixings and restraint — critical dimensions

    Tie spacing, restraint straps and fixing centres — the items that hold the structure together as one box.

    Maximum

    Floor deck fixing centres

    300 mm at supported edges, 500 mm at intermediate joists

    Boards laid with the long edge across the joists and joints staggered

    Maximum

    Lateral restraint strap spacing at floor and roof level

    2 m

    Straps at floor and ceiling level, carried over at least three joists with solid noggins

    Minimum

    Lintel end bearing length

    100 mm for spans up to 1200 mm; 150 mm for longer spans

    Masonry openings — confirm against the lintel manufacturer's schedule for the specific span and load

    Maximum

    Plasterboard fixing centres

    200 mm to ceilings, 300 mm to walls, and 150 mm at board ends

    Fixings kept at least 10 mm from cut edges and 13 mm from bound edges

    Maximum

    Racking board fixing centres

    150 mm at board edges, 300 mm at intermediate studs

    Fixings kept at least 10 mm from the board edge; pattern to the frame designer's specification where it is tighter

    Maximum

    Wall tie spacing at reveals and movement joints

    Additional ties at 300 mm vertical centres within 225 mm of the opening

    Within 225 mm of an unbonded vertical edge — reveals, movement joints, wall ends

    Maximum

    Wall tie spacing in a standard cavity wall

    900 mm horizontally, 450 mm vertically (2.5 ties per square metre)

    Masonry cavity wall, cavity width up to 100 mm, wall height up to 15 m

    Maximum

    Wall tie spacing to a timber frame

    Max 600 mm horizontally (at stud centres) and 450 mm vertically

    Ties screwed into studs, not sheathing alone; closer spacing at reveals and movement joints

    All critical dimensions · All topics

    These entries are our own editorial summaries of publicly available regulation. They are not building control approval, a warranty determination, or a substitute for the full source document.

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