Timber is used in engineering or construction purpose

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 