The date in which the building was constructed.
Materials Used.
Structural system and load capacity of the building, the future function of green roof, weather it is only for ecological conditioning (simple green roof, simple vegetation layer), or it is aimed for aesthetic betterment (intensive green roof with regular maintenance) or even for recreation in the form of roof garden (for normal recreation use, like gardens, open spaces, with regular and intensive maitenance).
Maybe the height of the building is also an important factor because of the building costs. If the structure has to be renewed and supported the building costswill rise immensely.
As soon as thinking of roof garden first problem is structural issues specifically dampness and water leakage.
second one amount of dead load increase which affects the durability of the existing structure.
depending upon what sort of roof garden you are projecting for and what sort of climate it is then, how adequate it will be reached for maintenances
either it is angular gardens, flat one or vertical depending upon varieties issues will be there.
Structural load carrying capacity of existing slab, Beam and foundation is to be checked. While calculating weight due to garden, saurated weight should be considered.
Slope of existing structure to avoid damping of excess water is important.
capillary action of water on side wall is to be considered.
The following factors should be considered:
Structural stability
Energy consumption
Stormwater runoff
Thermal performance of substrates
You can refer the following paper for more information:
Preprint Analysis of Physical and Chemical Properties of Alternative ...
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