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  • It is unreasonable to expect that, the roof joists do not have the same loading as floor joists.

  • according to BS6399-1:1996 Loading for buildings

    loadings to be:

    Roof
    Dead Load 0.85 kN/m²
    Imposed Load 0.85 kN/m²

    Ceiling
    Dead Load 0.25 kN/m²
    Imposed Load 0.25 kN/m²

    Floor
    Dead Load 0.50 kN/m²
    Imposed Load 1.50 kN/m²

    Walls
    Partitions 0.50 kN/m²
    Blockwork (100) 1.80 kN/m²
    Brickwork (112.5) 2.50 kN/m²

    example here

  • My house more than likely predates BS anything, but I am well aware that ceiling joists have a much smaller design load to support than floor joists. Professional advice is probably necessary, rather than all youse internet experts! :P

  • What do you understand from that?

    That is a genuine question by the way.

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