Upper floors: Party walls
If the joists are parallel on either side of the party wall, and where there is contact along the length of the wall and floors at least every 2 metres, no restraint is necessary. Examples of such ‘contact’ include an internal wall at right angles to the party wall or strutting to the floor. Where joists run at right angles to the party wall they should be supported by joist hangers with restraint hangers provided at 2m intervals. Joists should not be built into party walls to ensure fire protection, sound insulation, thermal insulation and also to help prevent air leakage.
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