2. ROOF CONSTRUCTION Meeting 9 Study Program: S0673 / Building Construction II Period: 2007

3. Bina Nusantara By the end of this meeting, expected student will be able to : Student can explain construction cover of roof along with materials and condition cover of roof. Learning Outcome 3

4. Bina Nusantara Items 1: Construction roof general condition. Items 2: Kinds of truss form and detail its extension. Items 3: Kinds of roof form. Items 4: Types conclusion of roof. Outline Items : 4

5. Bina Nusantara  General Roof is part of building having double function : a. Protector of building from rain and heat. b. Adding the Beauty of building. Condition which must fulfill :  Construction have to be sturdy, strength and made from materials which hold up and not easy to destroy by influence of weather, hot and rain.  Have to be compatible with its building form so that can add the beauty of building. Roof Construction 5

6. Bina Nusantara 3.Inclination of roof bevel angle have to in such a manner so that easy water emit a stream of. 4.Can give freshmen to its dweller. Marginally roof construction divided to become two shares: 1. Truss construction 2. Roof cover 6

7. Bina Nusantara  Truss Construction To determine roof framework type, things which must be paid attention :  Long and wide size measure of building.  Usage of building ( Store, building, house, warehouse, sport building, etc )  Ichnograph room form.  Unfold and apart between truss.  Building location.  Type conclusion of its roof. 7

8. Bina Nusantara Truss Construction materials made of wood, steel and earn also made from formed reinforced concrete like roof frame. Before chosen materials there are some matter which need to be paid attention :  Truss made of wood :  Durability  Size measure limited  Easy wood moulder to be eaten by white ants. 8

9. Bina Nusantara  Truss made of steel :  Melt when fire happened.  Corrosion easily  Heavily compared to with wood.  Truss made of concrete :  Heavily  Have to be calculated correctly.  Usually do not in form of easel frame, but like log. 9

10. Bina Nusantara Kinds Roof Form : 1.Roof Saddle. 2.Roof Shield. 3.Roof Saw. 4.Roof of Joglo. 5.Roof Tend 6.Roof of Jengki, etc. 10

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15. Bina Nusantara  Truss Part : a.Easel Foot Forming inclination of roof and as receiver all burden above him. As situating of it can be put down above column (wood/concrete) or brick wall. 15

16. Bina Nusantara b.Log Easel / Interesting Log. Caused by style of horizontal, hence easel feet will shift exit. Hence to avoid style of horizontal the attached a easel log or interesting log. 16

17. Bina Nusantara c.Log Hang / Middleman. Because unfolding wide easel, hence easel log will flex downwards, hence given by Hanging log. 17

18. Bina Nusantara d.Log Contributor (Skoor) Effect unfold easel progressively length, easel foot also more and more length. As a result also will flex and to avoiding it given contributor log or skoor. 18

19. Bina Nusantara e.Nipper log. functioning Nipper log so that easel construction not flex forwards or rear. 19

20. Bina Nusantara Progressively long unfold easel, its complicated construction progressively, meaning more and more contributor bars and bar its. When made easel of wood, hence dimension of each bar will become big and also will progressively heavily and inefficient again. So that in a moment unfold certain more efficient if made easel of steel or iron. 20

21. Bina Nusantara Example of convergent easel at concrete column or wall : 21

22. Bina Nusantara Example of easel converging above wood pole : 22