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I'm interested, if they are a different dimension or because of some other factor?
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according to BS6399-1:1996 Loading for buildings
loadings to be:
Roof
Dead Load 0.85 kN/m²
Imposed Load 0.85 kN/m²Ceiling
Dead Load 0.25 kN/m²
Imposed Load 0.25 kN/m²Floor
Dead Load 0.50 kN/m²
Imposed Load 1.50 kN/m²Walls
Partitions 0.50 kN/m²
Blockwork (100) 1.80 kN/m²
Brickwork (112.5) 2.50 kN/m²example here
Airhead
rive_gauche
@lynx
It is unreasonable to expect that, the roof joists do not have the same loading as floor joists.