1 / 30

Roofing

Learn about roofing basics, including different types of roofs, terms, and classifications. Discover pitched roofs, single and double roofs, trussed roofs, and flat roofs, along with detailed explanations and key terminology. Enhance your knowledge of roofing construction and design.

njudy
Télécharger la présentation

Roofing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Roofing

  2. ROOFS • It is constructed to protect the building from weather (rain, wind, heat, snow, etc) • Roof is the uppermost part of the building

  3. REQUIREMENTS OF A ROOF • Durable against various natural agencies • Adequate thermal insulation • Water proof • Fire resistant • Sound insulation • Good drainage arrangement

  4. CLASSIFICATION OF ROOFS • Pitched or sloping • Single roof, • Double roof, • Trussed roof. • Flat or terraced • R.C.C roof, • Madras terrace roof. • Curved • Shell roof, • Dome roof.

  5. PITCHED ROOFS • These roofs have sloping top surface • Suitable in those areas where rainfall/snowfall is very heavy • Span: clear distance between the supports of beams, roofs or truss • Rise: vertical distance between the top of the ridge and the wall plate • Pitch: inclination of sides of a roof to the horizontal • Ridge: an apex line of a sloping roof

  6. PITCHED ROOFS

  7. TERMS - ROOF • Gable: triangular upper part of a wall formed at the end of a pitched roof • Purlin: horizontal member placed over the principal rafters to support the roof membrane.

  8. TERMS - ROOF

  9. TYPES OF PITCHED ROOFS • Single roofs • Double or purlin roofs • Trussed roof • King post truss • Queen post truss • Mansard truss • Bel fast truss • Steel truss • Composite truss

  10. SINGLE ROOF: 1.LEAN TO-ROOFS • Rafters slope to one side only. • Upper ends- rafters are fixed by nails to the wooden plates. • Lower ends- rafters are notched & nailed to the wooden post plate. • Battens are placed and fixed over rafters. • Roof covering materials. • Spans upto 2.5 m.

  11. 2.COUPLE ROOF • Pair of rafters • Slopes to both sides • Upper ends- nailed to common ridge piece • Lower ends- notched & nailed to wooden wall plates. • Battens are fixed • Roof covering materials • Span upto 3.60 m.

  12. 3.COUPLE CLOSE ROOF • Tie beam • Prevent from spreading • Spans upto 4.20 m.

  13. COLLAR BEAM ROOF • Span increase or heavy load- leads to bend • Prevent by raising the tie beam • 1/3rd to ½ of the vertical ht. from wall plate to the ridge. • Spans upto 5m

  14. DOUBLE OR PURLIN ROOFS • Rafters- rest at the ends on wall • Purlins- intermediate supports • Spans upto 5.5 m.

  15. TRUSSED ROOF • A number of straight members connected in the shape of triangle and forming a frame is known as truss. • Truss are provided at regular interval of about 3m along the length. • Used for the span more than 5m.

  16. KING-POST TRUSS • King post- central post • Struts- inclined members • Principal rafters- support the purlins • Spans- 5 to 8 m.

  17. QUEEN-POST TRUSS • 2 vertical posts • Straining beam • 2 struts • Straining sill • Spans- 8 to 12 m.

  18. MANSARD TRUSS • Combination of king & queen post trusses. • Upper portion- king post truss • Lower portion- queen post truss. • Upper pitch- 30 to 40 degree • Lower pitch- 60 to 70 degree.

  19. BELFAST TRUSS/ BOW STRING TRUSS • Thin sections of timber • Top chord – curved • 30 m span – if roof covering is light • Rise not more than 1/8th of the span

  20. STEEL TRUSSES KING-POST STEEL TRUSS COMPOUND FINK & COMPOUND HOWE’S STEEL TRUSS ADVANTAGE: • stronger than wooden truss • Very large span (5m to 30m) • Easy to construct • Fire-proof • More rigid • Permanent • More economical

  21. STEEL TRUSSES…..Cont 1 DISADVANTAGE: • Likely to get rusted • Need anti corrosive paints. • Periodical maintenance required. USES: • Building with large span • Building with no intermediate columns. • Place of heavy rainfall of snow fall.

  22. COMPOSITE TRUSS • Timber and steel • Tension members – steel • Compression members – timber • Light and economical

  23. FLAT ROOFS • It is one which is either horizontal or horizontal with slope less than 10°. TYPES OF FLAT ROOFS: • Madras terrace roofs • Reinforced cement concrete slab roof

  24. MADRAS TERRACE ROOF

  25. MADRAS TERRACE ROOF

  26. REINFORCED CEMENT CONCRETE ROOF • Easy to cast • Very smooth surface • Length / width > 2 – one way • Length / width < 2 – two way

  27. CURVED ROOFS • Modification of pitched roof and are frequently employed in modern age to cover large areas. • Useful for assembly halls, recreation centres, factories, monumental works • Pleasing appearance • Types • Shell roofs • Domes

  28. NORTH LIGHT SHELL ROOF • Mostly used in • Factories • Work shops • Where good day light id desired

  29. BARREL VAULT SHELL ROOF • Long multiple cylindrical shell • Feather edge beams • Where day-lighting is not must

  30. DOMES • Semi-elliptical or semi-spherical • Uniform or varying thickness • Brick, stone, steel, wood, concrete or tile

More Related