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Questions and Answers
What material are Mineral Fiberboards made from?
What material are Mineral Fiberboards made from?
Which type of Wood and Wood Product board is used for sub-flooring, interior, and exterior walls?
Which type of Wood and Wood Product board is used for sub-flooring, interior, and exterior walls?
What are the sub-types of Plain Wood and Wood Products Chipboard based on sanding?
What are the sub-types of Plain Wood and Wood Products Chipboard based on sanding?
What makes Wood and Wood Products Particle Board have a smooth dense surface?
What makes Wood and Wood Products Particle Board have a smooth dense surface?
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Which type of Wood and Wood Product board can be laminated to produce a wood grain effect?
Which type of Wood and Wood Product board can be laminated to produce a wood grain effect?
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What characteristic makes Mineral Fiberboards valuable for outdoor installation?
What characteristic makes Mineral Fiberboards valuable for outdoor installation?
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Which classification of timber offers resistance to rapid drying during seasoning?
Which classification of timber offers resistance to rapid drying during seasoning?
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What is the classification based on treatability that refers to wood being resistant to preservatives?
What is the classification based on treatability that refers to wood being resistant to preservatives?
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Which portion of a tree accounts for about 80% of the total bulk of wood?
Which portion of a tree accounts for about 80% of the total bulk of wood?
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What is a characteristic of good timber related to strength based on the annual rings?
What is a characteristic of good timber related to strength based on the annual rings?
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Which of the following is not a characteristic of good timber?
Which of the following is not a characteristic of good timber?
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In the context of timber seasoning, which category can be rapidly seasoned free from defects?
In the context of timber seasoning, which category can be rapidly seasoned free from defects?
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What is the primary process in the manufacture of wood based products?
What is the primary process in the manufacture of wood based products?
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Which of the following woods is not mentioned as suitable for veneers?
Which of the following woods is not mentioned as suitable for veneers?
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What is the primary material used to make fiber boards?
What is the primary material used to make fiber boards?
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What is the ideal thickness range for the veneers produced in the manufacturing process?
What is the ideal thickness range for the veneers produced in the manufacturing process?
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Which product is extensively used for partitions, ceilings, doors, and concrete formwork?
Which product is extensively used for partitions, ceilings, doors, and concrete formwork?
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What are lamin boards primarily composed of?
What are lamin boards primarily composed of?
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What is a characteristic feature of building boards faced with paper or vinyl?
What is a characteristic feature of building boards faced with paper or vinyl?
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How does the arrangement of wood grains in building boards help neutralize shrinking and swelling?
How does the arrangement of wood grains in building boards help neutralize shrinking and swelling?
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Why is splitting in the plane impossible for plywood?
Why is splitting in the plane impossible for plywood?
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What characteristic allows plywood to be bent more easily than ordinary wood?
What characteristic allows plywood to be bent more easily than ordinary wood?
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What type of wood is plywood made of?
What type of wood is plywood made of?
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What allows plywood to offer numerous decorative possibilities?
What allows plywood to offer numerous decorative possibilities?
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What is the purpose of a girt in timber-framed construction?
What is the purpose of a girt in timber-framed construction?
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In combination framing, what are drop girts?
In combination framing, what are drop girts?
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What distinguishes a combination frame from a braced frame?
What distinguishes a combination frame from a braced frame?
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What is the main purpose of diagonal braces in a full frame construction?
What is the main purpose of diagonal braces in a full frame construction?
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What do raised or flush girts do in a combination frame?
What do raised or flush girts do in a combination frame?
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How do studs in a combination frame differ from those in a braced frame?
How do studs in a combination frame differ from those in a braced frame?
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Study Notes
Mineral Fiberboard
- Made from asbestos fibers mixed with cementing agent
- Ideal for fireproofing and acoustical purposes
Wood and Wood Products
- Chipboard: made from building board particles and a binder (phenolic resin/urea formaldehyde glue)
- Often faced with veneer
- Lends itself to a range of stain and paint finishes for indoor use
- Weather-resistant, making it valuable for outdoor installation
- Can be laminated for plywood as interior finishing
- Used for sub-flooring, interior and exterior walls
Sub-types of Chipboard
- Plain: unsanded, sanded on one side, or sanded on two sides
- Patterned: one grooved surface, either evenly or randomly
Particle Board
- Made from hardboard from relatively small particles, graduated from coarse at the center of the board to fine at the surface
- Produces a smooth, dense surface
- Both sides or one side of the surface are sanded, while edges are filled according to particular uses
- Can serve as a base applied with wood veneers, plastic laminates, printed wood grains, and chalkboard coating
- Used for shelving, millwork, and other furniture manufacturing
Gypsum Board
- A wall board having a gypsum core
- Variations:
- Special paper face where wood patterns can be printed and can be nailed with colored nails
- Glue-laminated to an interior surface to produce a wood grain effect
- Vinyl sheet-faced, made to imitate a textile surface, held by glue or aluminum or plastic moldings
Classification of Timber
- Based on seasoning characteristics:
- High refractory (Class A): slow and difficult to season, free from defects
- Moderate refractory (Class B): may be seasoned free from surface defects with some protection
- Non-refractory (Class C): can be rapidly seasoned free from defects
- Based on treatability:
- Easily treatable
- Treatable but complete preservation not easily obtained
- Only partially treatable
- Refractory to treatment
- Very refractory to treatment, with penetration of preservative being practically nil from the sides and ends
Structure of Timber
- A tree can be divided into three portions: crown, trunk, and roots
- The trunk accounts for about 80% of the total bulk of wood
Characteristics of Good Timber
- Principal characteristics of concern: strength, durability, and finished appearance
- Narrow annual rings, the closer the rings, the greater the strength
- Compact medullary rays
- Dark color
- Uniform texture
Wood Products
- Many wood-based products have been developed to economize on the use of timber
- Manufactured under controlled conditions in factories
- Desired shape, dimensions, appearance, strength, and durability
Types of Wood Products
- Veneers: thin sheets of wood, 0.4 to 0.6 mm in thickness, not exceeding 1 mm
- Plywood: a wood panel glued under pressure from an odd number of layers of veneers
- Fiber Boards: manufactured in various densities, soft, medium, and hard
- Building Boards: a group of sheets of building materials, often faced with paper or vinyl, suitable for use as a finished surface
Properties of Boards/Wood
- Strong across and along the panel, with more plies meaning near equal strength in both directions
- Shrinking and swelling can be neutralized due to wood grains running in one direction
- Splitting in its plane is impossible due to successive layers at right angles to each other
- Plywood can be bent more easily than ordinary wood of the same thickness
- Curvature depends on thickness and is limited by the strength of the outer pile in tension and inner piles in compression
- Plywood offers numerous possibilities for decoration due to the great variety of colors and textures
- Decorative effects can be achieved on the face ply by pressure, sandblasting, or etching with wire brushes
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Description
Learn about the classification of timber based on their behavior during normal air-seasoning practice. Discover the three categories: High refractory, Moderate refractory, and Non-refractory, each with its unique characteristics.
