Lean to roof

ROOFING TERMINOLOGY
TYPES OF ROOF
TYPES OF PITCHED ROOF

1. TIMBER ROOF LEAN TO ROOF BY JNANESH PREETHAN

2. TIMBER ROOF ■Roof the uppermost part of the building, provided as a structural covering,to protect the building from weather. ■ A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof. ■The roof coverings may be A.C. sheets, G.I. sheets, wooden shingles, tiles, slab itself.

3. REQUIREMENTS OF A ROOF It should be durable against the adverse effects of various agencies such as wind, rain, sun etc. The roof structure should be strong and stable enough to take up the anticipated loads safely including wind load. The roof designed according to may if provide daylight in buildings with large floor area. It should have efficient arrangement. water-proofing It should provide adequate insulation against sound and adequate thermal insulation.

4. ROOFING TERMINOLOGY

5. Gable The triangular upper part of a wall closing the end of a ridged roof Hip The external angle at the junction of two sides of a roof whose supporting wall adjoin. Valley The less-than 180-degree angle where two sloping roof sections come together Joist In a flat roof, a horizontal structural member over which sheathing is nailed

6. Flashing Sheet metal or other material used at junctions of different planes on a roof to prevent leakage. Rafter A structural member (usually slanted) to which sheathing is nailed Fascia Trim board behind the gutter and eaves. Soffit The boards that enclose the underside of that portion of the roof which extends out beyond the sidewalls of the house. Drip The strip of metal extending out beyond the eaves to prevent rainwater from rolling around the shingles back onto

7. TYPES OF ROOF • Pitched or Sloping Roof -The roof having slope surface. • Flat Roof or Terrace Roof- A roof is designated as flat if its slope is less than ten degrees. • Shell Roofs or curved Roof- A roof designed in curved shape SLOPED ROOF FLAT ROOF CURVED ROOF

8. TYPES OF PITCHED ROOF Single Roofs ➢Lean-to-Roof ➢Couple Roof ➢Couple-close Roof ➢Collar beam Roof or Collar tie Roof Double or Purlin Roof Framed or Trussed Roof ➢King Post Roof Truss ➢Queen Post Roof Truss ➢Combination of king-post & queen-post truss ➢Mansard roof Truss ➢Truncated roof Truss ➢ Bel-fast roof Truss or latticed roof Truss ➢ Composite roof Truss ➢ Steel sloping roof Truss

9. LEAN TO ROOF It is the simplest form of a pitched roof and it is known as pent roof. In this type of roof, The wall of one side of the room is taken higher than the wall on the other side to give necessary slope to the roof. A lean-to roof is generally used for sheds, out houses attached to main buildings verandah etc. This is suitable for a maximum span of 2.4m..

10. ■This lean to roof is constructed against an existing wall or other roof. ■Main use of this roof is for constructing sheds, simple extensions, car ports, for covering verandahs, etc. When any storage building will require additional space than the lean to roof is constructed with existing wall. ■Construction of lean to roof is easy and inexpensive. ■Due to slope of the roof, water and snow easily run off and reduces necessary extra waterproofing. ■So this roof is best for constructing in high rainfall and snowfall regions. This may be done either as a part of original construction or even during execution after some year. ■In this roof, the roof covers may be of Mangalore tiles, A.C sheets or even pre-coated sheet and this roofing sheet also add beauty to the structure apart from it functional use. ■This roof is not adequate for a long span where its width is more as minimum clearance of 2.0 m to 2.5 m at eaves level is needed.

11. BASIC ELEMENTS BATTENS: These are thin strips of wood which are fixed on the common rafters CORBEL STONES : allow buildings to hold weight bearing structures that project out horizontally from a wall. EAVES BOARD : This is a wooden board fixed to the feet of the common rafters at eaves COMMON RAFTER: These are the intermediate rafters, which give support to the roof coverings.