1. Wood Members: Báez, Nathaly. 09-10934 Troconis, Reynaldo. 09-10854

2. Introduction Wood is a hard, fibrous tissue found in many plants. It has been used for centuries for both fuel and as a construction material for several types of living areas such as houses. Construction with wood is known as carpentry. It is an organic material, a natural composite of cellulose fibers (which are strong in tension) embedded in a matrix of lignin which resists compression.

3. talking points 1.What is Wood? 2.Benefist of Wood 3.Disadvantage of Wood 4.Use of Wood 5.Conclusion

4. What is Wood? Wood comes from the trunk (main stem) of trees. A tree’s stemserves two main purposes: to support the branches, leaves and flowers of the tree to transport water and nutrients from the roots to the leaves, and sugar andother food stuffs from the leaves to all the other areas of the living tree. There is a strong relationship between the properties of wood and the properties of the particular tree that yielded it. For every tree species there is a range of density for the wood it yields. There is a rough correlation between density of a wood and its strength (mechanical properties). For example, while mahogany is a medium-dense hardwood which is excellent for fine furniture crafting, balsa is light, making it useful for model building. The densest wood may be black ironwood.

5. Use of Wood Fuel: Hardwood is preferred over softwood because it creates less smoke and burns longer. Adding a woodstove or fireplace to a home is often felt to add ambiance and warmth. Furniture and utensils: Wood has always been used extensively for furniture, including chairs and beds. Also for tool handles and other utensils, like the wooden spoon. In arts: It has been used to make sculptures, music instruments and other objects. Sports: Many types of sports equipment are made of wood, or were constructed of wood in the past. For example, cricket bats and baseball bats

6. Wood use in construction Wood has been an important construction material since humans began building shelters, houses and boats. Nearly all boats were made out of wood until the late 19th century, and wood remains in common use today in boat construction. Wood to be used for construction work is commonly known as lumber in North America. Elsewhere, lumber usually refers to felled trees, and the word for sawn planks ready for use is timber. New domestic housing in many parts of the world today is commonly made from timber-framed construction. Engineered wood products are becoming a bigger part of the construction industry.

7. Advantage of Wood Wood is easier to acquire, transport, and work than other natural materials. All parts of a building can be efficiently constructed of wood except foundations. Besides being cheap, lightweight, and moderately strong in compression and tension

8. Disadvantage of Wood Wood is susceptibility to fire, mold, and termites. So, it rots, swells and burns easily.

9. Conclusion Iglesia Ortodoxa Rumana, “Constantino y Elena” Wood has excellent properties which lend themselves to human use. It is readily and economically available; easily machinable; amenable to fabrication into an infinite variety of sizes and shapes using simple on-site building techniques; exceptionally strong relative to its weight; a good heat and electrical insulator; and—of increasing importance—it is a renewable and biodegradable resource. For all those reason, wood is a great construction material used by humans since ancient world and the oldest after stone.

10. Source http://en.wikipedia.org/wiki/Wood http://www.dpi.nsw.gov.au/aboutus/news/bush-telegraph- magazine/winter-2009/what-is-woodhttp://www.dpi.nsw.gov.au/aboutus/news/bush-telegraph- magazine/winter-2009/what-is-wood http://www.aboutcivil.com/Wood%20as%20construction%20material.htmlhttp://www.aboutcivil.com/Wood%20as%20construction%20material.html