(a) Base ;- The prepared surface on which the floor topping or under layer is laid is known as base. This normally consists of 100mm thick sand for ground floor. It is also known as base course.
(b) Under layer;- The course of material laid between topping and base is called under layer. It normally consists of lean c. concrete or lime concrete. lts thickness may vary between 80 to 100 mm.
(c) Topping;- The topmost layer of a floor laid over the under layer is known as topping. Sometimes, it forms the finished surface of the floor also. 1ts normal thicknes is taken as 40 mm.
(d) Floor finish: The special layers laid to form their upper surface or wearing surface, which normally
render surface finish is called tloor finish e.g. Mosaic or terrazo finish. It is normally 10 mm. to 30 mm. thick
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