Roof Loadings
The basic roof structure may be of concrete, metal or timber: it must be strong enough to withstand the maximum predicted loads with a suitable factor of safety.
Inverted roofs are subject to three main loads:
- dead loads: the self-weight of all the materials used: for calculation advice see BS 6399: Part 1.
- wind loads: the positive and negative pressures acting on the roof should be calculated using either the standard or directional method given in BS 6399: Part 2. To calculate the weight of ballast required to resist wind uplift refer to BRE Digest 295.
- imposed loads: see BS 6399: Part 3.
