Swami Keshvanand Institute of Technology, Management & Gramothan, Ramnagaria, Jagatpura, Jaipur-302017, INDIA Approved by AICTE, Ministry of HRD, Government of India Recognized by UGC under Section 2(f) of the UGC Act, 1956 Tel. : +91-0141- 5160400 Fax: +91-0141-2759555 E-mail:
[email protected] Web: www.skit.ac.in Roof and Roof Coverings A roof is a most important part of the building. It protects the building and its parts from the effects of weather. Structures that require roofs range from a letter box to a cathedral or stadium, dwellings being the most numerous. In most countries a roof protects primarily against rain. Depending upon the nature of the building, the roof may also protect against heat, against sunlight, against cold and against wind Components or Elements of Pitched Roofs 1. Span Span of roof is the clear distance between the two supports on which roof is positioned by some other elements. 2. Ridge The apex of the angle which is developed at top by the inclined surfaces at the top of slope. 3. Rise The vertical distance or height of top of ridge from wall plate is called as rise. 4. Wall plates Wall plates are provided at top of wall or supports. And these are generally made of wood and are used to fix the common rafters. 5. Pitch Pitch is nothing but slope of roof with the horizontal plane and is calculated as the ration of rise to span. 6. Eaves The bottom edge of sloped roof surface is called as eaves from which rain water is drops down during raining.