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Roofing tiles are used to cover the pitched roofs. These tiles are thin compared to bricks so it is necessary to handle them carefully at all the stages of manufacture. These tiles should be strong durable and perfectly leakproof. Following are the important types of the roofing tiles
Types of Roofing Tiles
These tiles are rectangular and are of various dimensions. They are laid in cement or lime mortar. The different types of flat tiles are discussed below.
Burnt Clay Flat Terracing Tiles
They are uniform in shape, size and free from irregularities such as twist, bends, cracks, etc. The water absorption should not exceed twenty per cent by weight. These are available in the size of 60 cm × 30 cm × 15 cm and 50 cm × 20 cm × 10.
These tiles are reasonably straight with uniform colour, texture, free from veins, cracks, fissures white patches, etc. The compressive strength should not be less than 7.5 N/mm2.
Pot Tiles or Country Tiles or Locking Tiles
These are ordinary half round country tiles, and they are also called the locking tiles. These tiles are also sometimes called pantiles. They are hand moulded, First into a flat tile, then to the required shape on the wooden pattern and burnt in a kiln after drying.
These tiles are semi-circular in section. These are used either alone or with flat tiles. These tiles are less liable to be displaced by the birds. These tiles find extensive use in rural areas.
They may be used as a sole covering to the roof. These tiles are laid on the stepped roof, and the concave side up and longer end towards the ridge.
Then another row of the same tiles with the convex side up and small end towards the ridge is laid, covering every pair of below tiles’ adjoining edges.
These tiles are of a different shape. They are generally laid side by side and joints are then covered with half-round tiles. They are used for making good and pleasing roofs.
The burning of these tiles is done in such a manner that they attain more strength. The tiles of special shape are made for hip, ridge and valley portions of the roof.
These tiles have corrugations and when they are placed in position aside lap of one or two corrugations is formed. The placing of such tiles on a roof gives an appearance of corrugated galvanized iron sheets.
These tiles are red in colour and made of double channelled Basel Mission Mangalore pattern. They are of flat pattern and are provided with a suitable projection so that they interlock with each other when placed in position.
The individual Mangalore tiles are available for the hip, ridge, and valley part of the roof. They are manufactured on a large scale in south India, especially at Mangalore, Cochin, and Calcutta. This tile’s life is about 25 years, with a replacement of about five per cent per year.
Based on BIS-654-1962 the Mangalore pattern tiles are divided into two groups, viz, class AA and Class A
They are hollow tapered burnt clay tiles with conical shape and base of diameter 100 mm at the broader end and 75 mm at the narrow end. The thickness of the annular rise is 6 mm. they can be manufactured on the potter’s wheel. According to their conical shape, they can be inserted into another to form a ring. The ring may be made of suitable ways like circular, parabolic, elliptical, etc.
Ridge, Valley and Lip Tiles
These tiles are made from the good earth and are specially shaped.
These tiles are consist of three layers :
- The face is a thin coat of pure clay of the colour required.
- The body is of coarse clay.
- The back is formed with a thin layer of clay different from the body as it is to prevent warping.
- These tiles are employed for decorative purpose.
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