The usual depth of the stored water on a blue roof is unlikely to be more than 100-150mm in depth, as such the increased load imposed by a blue roof is minimal (1.0-1.5kN/M2 load). However, a detailed structural analysis should be carried out by a suitably qualified engineer. As most blue roofs are designed in conjunction with a green roof build up, they will tend to require a concrete slab to be specified.
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