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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A 50 kg bag of cement typically covers about 0.5 to 1 square meter when used for flooring, depending on the thickness of the layer applied and the mix ratio with aggregates. For a standard thickness of 5 cm for a concrete floor, you can expect to cover closer to 1 square meter. It's important to consider the specific project requirements and mixing proportions for more accurate estimates.
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.