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Alternate roofing

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krishnakanth

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Alternate roofing

  1. 1. ALTERNATE ROOFING MATERIALS TO R.C.C
  2. 2. • Stone slab roofing • Jack arch roofing • Madras roofing • Deck roofing
  3. 3. ● Alternate building materials are those which can be used economically by replacing the conventional building materials. ● These materials are historically appropriate,cost effective,easy to install,and functional in wildland fire environments. ● Eventually in stone slab roofing different forms of mortar were used to hold the stones together, cement being the most commonplace now. INTRODUCTION STONE SLAB ROOFING
  4. 4. • Where particular geology made it easy to split stones into large slabs or where such flat stones were produced by nature, they formed a natural building material. • Traditionally, stone slabs provided excellent insulation and unique looks. Stone slab roofs are also solid and virtually stormproof. • Nowadays, a stone slab roof might be seen as part of the restoration of a heritage building, or as a decorative feature - although rarely as the main roof.
  5. 5. Stone roofs • Stone roofs are not much used at the present time, except for covering small vestibules, porches, turrets, towers, and monumental buildings. • They may be flat or pitched. Large slabs are used for flat roofs, and small ones for pitched roofs.
  6. 6. Methods of Construction: CONTEMPORARY METHOD • It is a flat roofing system with stone slabs resting over steel or slender rcc section beams. • The slabs are laid over the terracing for insulation and to provide a slope for rain water drainage.
  7. 7. METHODS OF CONSTRUCTION : TRADITIONAL METHOD • In this system stone slabs are placed over wooden planks which are supported on wooden beams. • This keeps the building cool and is mainly suitable for hot and dry climate. • There is no need of centering and shuttering.
  8. 8. METHODS OF CONSTRUCTION
  9. 9. TYPES OF STONE SLAB ROOFING Ex at Karnak,Egypt A structure with stone walls, supporting flat roof made of stone slabs of large boulders. Corbelled roof Flat roof Gabled roof
  10. 10. Advantages and Disadvantages • Good insulation • Beautiful appearance • They are solid and also storm proof • Water proof roofing • Durability • Very heavy • Labour incentive • An obsolete cladding material • Not suitable to withstand loading from furniture, etc of modern residential buildings.
  11. 11. JACK ARCH ROOFING
  12. 12. INTRODUCTION • A jack arch is classically defined as a structural element in masonry construction that provides support at openings in the masonry. • Alternate names are FLAT ARCH and STRAIGHT ARCH. • Unlike regular arches, jack arches are not semicircular in form. • Instead they are flat in profile and are used under same circumstances as lintels.
  13. 13. MATERIALS • This type of roof may be built with materials such as brick, steel, concrete, and clay-gypsum mortar. • The roofing technique in auroville is that of jack arch roof with terra cotta hollow blocks and pre cast concrete beams.
  14. 14. ADVANTAGES • It can be constructed from relatively small pieces of material that can be handled by individuals . • Arches are typically sawn from an appropriately sized fired clay lintel. • There is considerable scope for in corporation of decorative patterns and elements into jack arches.
  15. 15. CONSTRUCTION DETAILS
  16. 16. JACK ARCH AT AUROVILLE
  17. 17. MADRAS TERRACE ROOFING
  18. 18. INTRODUCTION o This is the traditional roofing found in south India. o It involves the use of wood,“aachikal”(a locally available material which is a small brick)and lime plaster. o These are commonly used for small spans. o Wooden beams are used to cover the span, over this wooden beams are laid at intervals of less than 45 cms from each other. o The gaps between is filled with bricks on edge with lime plaster. Upon this “ aachikal brick “is laid on edge across in diagonal fashion plastered with lime.
  19. 19. CONSTRUCTION DETAILS • STEPS IN CONSTRUCTION o Teak wood joist are placed on rolled steel joists. o Sufficient slope is provided. o Terrace bricks of size 15x75x25mm to be laid diagonally. o Brick bat concrete of thickness 75mm to be laid. o Rammed and allow to set for 3 days. o Flat tiles are then laid over this concrete. o Surface of this roof is finished with 3 coats of plaster.
  20. 20. Construction Process
  21. 21. ADVANTAGES • It is easy for construction and maintenance. • Flat roofs possess good insulation properties. • It provides better light,ventilation and architectural appearance to the building. • Upper floor can be easily constructed. • Fire resistant.
  22. 22. DISADVANTAGES • Madras roofs are not suitable for long span ,with out the introduction of columns and beams. • Initial cost is less than a pitched roof • Not suitable for places of heavy snowfall. • Construction speed is slower than pitched roof
  23. 23. DECK ROOFING
  24. 24. DECK ROOFING • A flat open portion top of a roof such as a terrace or a sun deck
  25. 25. TYPES OF DECK ROOFING • Depending upon materials used there are four types of deck roofing. 1.Steel deck roofing. 2.Wood deck roofing. 3.Concrete deck roofing. 4.Cement deck roofing.
  26. 26. STEEL DECK ROOFING • Materials used in steel deck roofs are light- gauge , cold- rolled sections , welded or screwed to bar joists.
  27. 27. WOOD DECK ROOFING • Materials used are sawed lumber, asphalt , ply wood or OSB (oriented strand board).
  28. 28. CONCRETE DECK ROOFING • There are four types of concrete deck roofs 1.Structural concrete deck. 2.Structural composite concrete deck. 3.Precast concrete deck. 4.Lightweight insulating concrete deck. • Concrete roof decks are commonly topside insulated using adhered insulation panels or cast-in-place lightweight insulating panels.
  29. 29. USES • The primary use of steel roof is to support vertical loads and the weather resisting system , such as insulation , roofing and waterproofing materials. • Deck roofing can be used in garden landscaping , to extend living areas of houses.
  30. 30. Source ● http://www.ruralhousingnetwork.in/technology/56adb59c336c497dc92b53d6 ● https://www.google.co.in
  31. 31. Thank you!

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