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Questions and Answers
Timber is often used as ______, beams, lintels, doors and windows.
Timber is often used as ______, beams, lintels, doors and windows.
posts
Timber can be used in ______, roofing, ceilings.
Timber can be used in ______, roofing, ceilings.
floorings
Timber is used for making ______, sports goods, railway sleepers.
Timber is used for making ______, sports goods, railway sleepers.
furniture
The ______ of timber should be uniform.
The ______ of timber should be uniform.
A clear ringing sound when struck indicates the timber is ______.
A clear ringing sound when struck indicates the timber is ______.
The ______ of good timber is fine and even.
The ______ of good timber is fine and even.
Timber with higher ______ have thicker walls and are stronger.
Timber with higher ______ have thicker walls and are stronger.
Good timber does not ______ under changing environmental conditions.
Good timber does not ______ under changing environmental conditions.
Timber should be capable of resisting ______ loads.
Timber should be capable of resisting ______ loads.
The quality of timber must be ensured before using it for a ______.
The quality of timber must be ensured before using it for a ______.
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Study Notes
Plywood Types and Uses
- Interior Plywood: Bonded with water-resistant adhesive, suitable for cabinetry, rough flooring, and finished walls.
- Exterior/Structural Plywood: Uses waterproof adhesive, ideal for wall sheathing, finished walls, roof sheathing, and concrete forms.
Laminated Timber
- Glu Laminated Timber: Process of bonding layers of lumber increases spanning capabilities and alters traditional construction techniques.
- Customization: Beams, arches, and various shapes can be fabricated, made from kiln-dried lumber for both interior and exterior applications.
- Prefinished Products: Typically prefinished in factories with protective wrapping before delivery.
Lumber Products
- Types: Includes rough framing members (minimum 2″ thick), finished lumber (e.g., flooring, trim, paneling), and specialty items (decorative panels, carved doors).
- Classification:
- Rough-Sawn Lumber: Cut to size but not dressed or surfaced.
- Surfaced Lumber: Finished to size by planing (S2S for two sides, S4S for four sides).
Plywood Characteristics
- Construction: Made of several layers of lumber with grains arranged at right angles, typically using an odd number of layers for consistency in grain direction.
- Standard Size: Commonly available in 4' × 8' panels with thicknesses ranging from 1/8" to over 1".
- Economical Benefit: Modular size and uniformity enhance speed in construction.
Timber Uses and Importance
- Employed in structural applications (posts, beams, lintels) and various building components (flooring, roofing, ceilings).
- Utilized in decorative applications and furniture making, as well as in durable items like railway sleepers and sports goods.
Properties of Timber
- Quality Assessment: Must be evaluated for various properties before usage.
- Color: Should be uniform; light color suggests weakness.
- Odor: Freshly cut timber should have a pleasant smell.
- Soundness: A clear ringing sound upon striking indicates good quality.
- Texture: Good timber exhibits fine and even texture.
- Grains: Close grains indicate quality timber.
- Density: Higher density correlates with stronger timber.
- Hardness: Harder timber is typically more durable.
- Warping: Quality timber does not warp with environmental changes.
- Toughness: Should withstand shock loads effectively.
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