This document discusses timber as a building material. It defines timber as wood suitable for engineering construction and notes it has been used as a primary construction material since early times. Timber comes from exogenous trees. The document outlines the advantages of timber, such as its ease of handling, ability to be shaped, insulating properties, and availability. It also describes characteristics of good timber, sawing methods, seasoning techniques to remove moisture, common defects, preservatives to increase durability, common uses of timber, and the most widely used types of timber in Bangladesh.

1. Building Materials & Construction
CE-2153
Timber-as Building materials

2. Nur-160518
Raihan-160521
Biswazid-160526
Hasan-160529
Asha-160530
Group No. 04
Group Members
Forestry & Wood Technology Discipline, Khulna University, Khulna, Bangladesh

3. TIMBER
 The wood which is suitable or fit for
engineering construction or
engineering purpose is called Timber
 Timber is one of the primary
materials of engineering
construction from the very earlier
time
 Only from Exogenous trees, we get
timber

4. Sources of Timber

5. Advantage of timber
Can be easily handled and joined
Timber can be used for both load –bearing structure and non load bearing instrument
It can easily converted to any shape and size
The wastage in timber construction is less
Timber has better insulating properties than other materials
Durability of timber can be very high if properly seasoned and preserve
Timber construction is light in weight and strong and can be made economical
For aesthetic & decorated appearance
Easily available
High energy efficiency

6. Characteristics of good timbers
Strong, stiff, tough & durable
Free from natural & artificial defect
Radially sawn
Color should be dark as it indicate strong & durable timber
Structure should be uniform
Have a good workability
Density should be high
Have a sweet smell
should have elasticity
Should be resistant to compression
Should be fire resist
Should have law water permeability

7. Sawing of Tree Log
Methods of Sawing:
Ordinary or Plain sawing
Radial or Rift sawing
Tangential sawing
Quarter sawing

8. Seasoning
• Fresh timber have about 30 to 40 percent of
sap or moisture. This moisture is very harmful
for the life of timber
• It is essential to remove the sap by applying
certain special methods
• All such are collectively termed as seasoning
Seasoning
Water
ArtificialNatural
Kiln chemical Electric

9. Seasoning technique

10. Advantages of Seasoning
It has reduced weight
 Strong & durable
Resistance to decay and rot
Take high polish
Easier to work with
Last longer

11. Defects in Timber
Defect due to seasoning
Some other defects occurring in
timber:
Defects due to
conservation
Defects due to fungi
Defects due to Insects
Knots

12. Objects of timber preservation
To increase the life of timber structures
To make the timber structures durable
To protect the timber from the attack of destroying agents
such as fungi, insects, etc.

13. Timber preservatives
The main timber preservatives are :
 Ascu treatment
 Coal tar
 Paint
 Cresote oil
 Chemical salts
Zinc chloride is the most extensively used of this types.
It is clean and odourless

14. Uses of timber
• Building construction
• House post construction
• Construction of bridge and boat
• Furniture & instrument
• Railway slipper
• Toys and engraving work
• Formwork of cement concrete

15. Use of timber in construction
• Beam
• Trusses
• Rafters
• Doors frame and shutters
• Windows frame and shutters
• Stair cases
• Poles
• Piles
• Columns

16. Common timber in Bangladesh
Teak
Garjan
Gamari
Jarul
Shisso
Shiris
Mahogany
Chapalish etc.

17. Summary
From all of these slides, we have learned….
• Source of timber
• Advantages of timber
• Characteristics of good timber
• Sawing methods of Log
• Seasoning & seasoning technique
• Defects of Timber
• Preservation of timber
• Use of timber
• Use of Timber in construction
• Common timber of Bangladesh

18. That’s all…..
Thank you 