Flat rooftops can offer great opportunities for conversion into attractive entertaining or relaxing areas, but contemplating a vast expanse of drab concrete or asphalt and envisaging how to attack such a problem, can be a rather daunting prospect.
Two important points need to be considered at the outset. Firstly, any objects on a roof top which are not securely fixed, need to be of sufficient weight or size that they will not move or blow away in strong winds.
Secondly, if there is a waterproof membrane on the roof, extreme care must be taken that the membrane is not punctured or damaged in any way. You will probably need to consult the building owner before placing any objects on the rooftop to ensure you are not faced with any potential liability issues.
The most important thing that then needs to be decided is what to install on the surface. If there’s a waterproof membrane, then your choices are rather limited as it’s obviously not possible to lay conventional porcelain tiles.