Basics in Building Construction

Building Components And Types

Lesson 19 : Roof And Roof Coverings

Types Of Flat Roofs

Lime Concrete Terracing With Tiles

This type of terracing is commonly adopted over R.C.C. roofing. Below are the steps of how the terracing is laid:

1. The R.C. slab is cleaned off dust etc. land layer of hot bitumen is applied at the rate of 1.7 kg per sq. meter of roof surface.
2. A layer of coarse sand is immediately spread over the hot layer of bitumen, at the rate of 0.6 cubic meter of sand per 100 sq. meter of roof surface.
3. A 10 cm thick (average) layer of lime concrete is laid, in proper slope. The entire slope is given in lime concrete itself. The lime concrete may consists of 2 parts of lime, 2 parts of surkhi and 7 parts of brick ballast of 25 mm gauge. The concrete is well beaten.
4. Two courses of flat brick tiles are laid in 1: 3 cement mortar. The joints of top course are pointed with 1: 3 cement mortars. The vertical joints in the two courses are broken.