I am not an expert but from experience selling tiles the following are guidelines:
1. The type of surface determines how much cement to use
2.The quality of cement will also affect ratio
3.The area to be tiled e.g. wall or floor determines the quantity
on average 2-3 squares meters will require one 20Kg tile adhesive
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FAR=Total floor area of building / Total lot area
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the p/a ratio is the sum of the perimeter divided by the area therefore if perimeter is 20m and the area 25m2 the sum is 20/25=0.8
The Vacuum Dewatered Flooring or VDF Flooring is a system for laying high quality concrete floors where the key is Dewatering of Concrete by Vacuum Process wherein surplus water from the concrete is removed immediately after placing and vibration, thereby reducing the water: cement ratio to the optimum level.
The following areas are to be excluded from gross floor area for the purpose of computing floor area ratio: (FAR)• Basement, underground parking, and attic spaces.• Porches, balconies, patios, breezeways, and decks (as well as overhangs, eaves, cantilevers, awnings and similarfeatures) with a "solid" cover but not enclosed by "solid" walls on more than two sides.• gardens which do not have a "solid" cover.• Parking structures and garages which are incidental to a primary use on the same site in multi-family, commercial,office, industrial and public/semi-public uses.• Air spaces within buildings such as vaulted ceilings or the air space above an atrium in an office or museum building.More specifically, the floor area shall be counted at the actual floor area only and not in the air spaces above.