Timber in Construction Engineering

Questions and Answers

timber

lumber

Used in flooring and roofing (correct)

Used as posts and beams (correct)

Used for making electronics

Used for making furniture (correct)

False Signup and view all the answers

S2S Signup and view all the answers

Several layers of lumber arranged with the grain at right angles Signup and view all the answers

strength Signup and view all the answers

Fine and even texture Signup and view all the answers

warp Signup and view all the answers

A clear ringing sound Signup and view all the answers

Study Notes

Timber refers to wood used for construction and engineering purposes.
Key building material utilized in structural framing, cabinetry, flooring, and architectural woodwork.

Exhibits high strength in compression, tension, and bending relative to its weight.
Possesses excellent impact resistance.

Lumber is wood cut to specific thickness, width, and length.
Types of lumber include:
- Rough framing members (minimum 2″ thick) like beams and posts.
- Finished lumber for flooring and trim.
- Specialty items such as decorative panels and carved doors.
Lumber classification:
- Rough-sawn: cut to size but not finished.
- Surfaced: finished with a planer, with designations S2S (dressed on two sides) and S4S (dressed on all four sides).

Made from several layers of lumber with perpendicular grain orientation for strength.
Generally available in 4′ × 8′ panels; thickness ranges from 1/8″ to over 1″.
Types of plywood:
- Interior plywood: uses water-resistant adhesive for cabinetry and walls.
- Exterior plywood: uses waterproof adhesive for wall sheathing and roof sheathing.

Involves laminating wood layers with adhesives to create large-span structures.
Suitable for beams and arches, and prepared for both interior and exterior applications.

Common applications include:
- Structural components like posts, beams, lintels, rafters, purlins, and trusses.
- Interior decoration and furniture making.
- Additional uses in sports goods and railway sleepers.

Color uniformity indicates quality; light colors may signify weakness.
Freshly cut timber should have a pleasant odor.
Good timber produces a clear ringing sound when struck.
Texture should be fine and even with close grains.
Higher density indicates stronger timber through thicker walls.
Durability is marked by resistance to warping and shock loads.
Good timber shows high abrasion resistance and strength in bending, shear, and compression.
Modulus of elasticity should be high for preferred construction materials.
Specific gravity varies from 0.3 to 0.9, indicating the material's density and porosity.