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JECA: Building Materials & Construction > DIVISION 06: Woods > Flashcards

DIVISION 06: Woods Flashcards

1
Q

The classification of wood which comes from conifers (evergreens) which have needles instead of leaves.

e.g. PINE

A

Softwoods

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2
Q

The classification of wood which comes from the broad-leaved or deciduous trees.

e.g. Timber

A

Hardwoods

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3
Q

The layer of wood which lies between the cambium and the heartwood. It is more permeable, less durable and usually lighter in color than the heartwood.

A

Sapwood

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4
Q

It is the older, harder central portion of a tree. It is denser, less permeable and more durable than the surrounding layer.

A

Heartwood

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5
Q

The property of wood which is measured by the compression which a piece of timber undergoes when a weight is applied to it.

A

Hardness

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6
Q

The property of wood which pertains to the amount of piece will bend before breaking.

A

Flexibility

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7
Q

Caused by the attack of fungi.

A

Decay

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8
Q

Cracks or lengthwise separation across the annual rings of growth caused by irregular shrinkage during drying.

A

Checks

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9
Q

Cracks between and parallel to the to the annual rings of the growth.

A

Shakes

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10
Q

Irregular growth in the body of a tree which interrupt the smooth curve of the grain.

A

Knots

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11
Q

These are well-defined openings between annual rings containing solid and liquid pitch

A

Pitch pockets

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12
Q

The lock of wood on the edge of the corner of a piece.

A

Wane

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13
Q

Wood defect which is caused by unequal shrinkage of the board.

A

Warping

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14
Q

It refers to lumber cut tangent to the annual rings or growth or in commercial practice, cut with annual rings at an angle of 0° to 45°; preferable when pleasing pattern is required, as in wall paneling.

A

Plainsawing

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15
Q

It refers to wood cut radially to the annual rings of growth parallel to the rays or, in commercial practice, cut with the annual rings at an angle of 45° to 90°; desirable because it has less shrinkage.

A

Quartersawing

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16
Q

Wood used in construction.

A

Lumber

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17
Q

Lumber less than 2” thick and less than 8” wide.

A

Strips

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18
Q

Lumber less than 2” thick and at least 8” wide.

A

Board Lumber

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19
Q

Lumber more than 2” thick and less than 5” in any dimension.

A

Dimension Lumber

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20
Q

Lumber pieces 5” or more on the smallest dimension.

A

Timbers

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21
Q

It is the size of the lumber when it is cut from the log.

A

Nominal Size

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22
Q

The process of removing moisture from greenwood is called _________.

A

Seasoning

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23
Q

A process of “seasoning” in which the lumber is exposed to the air.

A

Air-drying

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24
Q

A process of “seasoning” in which warm moist air or superheated steam is used to heat the wood and drive out moisture.

A

Kiln-drying

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25
Q

It is used to forestall attack by decay, fungi, harmful insects and marine marine borers in woods.

A

Wood preservatives

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26
Q

An oil-type wood preservative made from distilling coal tar; it is highly toxicity to wood-destroying organisms; strong in odor, cannot be painted, easily ignited during when first applied.

A

Coal-tar creosotes

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27
Q

It gives protection against decay, insects and fire; can be painted; has no objectionable odor; cannot be used in contact with the ground or water.

A

Chromated zinc chloride

Water-borne wood preservative

28
Q

Water-borne wood preservatives which are dissolved in water for pressure treating, producing a product that is clean and odorless. Undergoes a chemical process known as “fixation”.

A

Chromated Copper Arsenate (CCA)

Ammoniacal Copper Arsenate (ACA)

29
Q

A method of applying wood preservative which consists in placing the wood in cylinders into which the preservative is pumped under pressure.

A

Pressure treatment

30
Q

A method of applying wood preservative which consists first in placing the wood in a bath of hot and cold preservative for an hour or more.

A

Hot and cold bath method

31
Q

Are those products made from a mixture of wood and other materials.

A

Wood composites

32
Q

The most common wood composite. Made of several thin plies, or veneers of wood glued together.

A

Plywood

33
Q

Plywood thickness for double wall partitions and ceilings

A

3/16” thk (4.5mm)

1/4” thk (6mm)

34
Q

Plywood thickness for drawers and shelves.

A

3/8” thk (10mm)
1/2” thk (12mm)
3/4” thk (19mm)

35
Q

Plywood thickness for cabinets, closet doors, and sub floors.

A

1” thk (25mm)

36
Q

Types of Plywood:

A

Ordinary Plywood
Form Plywood
Marine Plywood
Fancy Plywood

37
Q

This is a paneling material made by reducing and refining wood chips into small, thread-like fibers, and then pressing them under heat in hydraulic pressure into dense, smooth, and very rigid panels; Cheaper option than plywood.

A

Hardboard
4’ x 8’ (1220mmX2440mm)
1/8” (3mm); 3/16’ (4.5mm); 1/4” (6mm)
Plain, textured, perforated surface

38
Q

Type of hardboard which is flexible and easy to bend. Only suitable for interior use and where it is not subject to moisture.

A

Standard hardboard

39
Q

Type of hardboard which is somewhat denser than the standard but not as dense as tempered.

A

Panel hardboard

40
Q

Type of hardboard which is the densest type, made by impregnating standard board with tempering compound of oils and resins and baking it polymerize the tempering materials; ideal for external use.

A

Tempered hardboard

41
Q

Brand names of Hardboard:

A

LAWANIT standard and tempered boards - Philippine Wallboard Corp.
LAWANEX panel boards - Philippine Wallboard Corp.
MASONITE standard, panel and tempered hardboard

42
Q

Made by bonding together wood particles with an adhesive under heat and pressure to form a rigid board with a relatively smooth surface, often faced with veneer.

A

Chipboard
2’x4’ (600mmX1220mm) , 4’x4’ (1220mmX1220mm) , 4’x8’ (1220mmX2440mm)
1/4” thk (6mm) to 1” thk (25mm)

43
Q

chipboard which is widely used for self-assembly furniture, work surfaces, wall linings and partitions.

A

Veneered Chipboard

44
Q

chipboard used as a basis for the carcasses of kitchen furniture, worktops, and flooring.

A

High-density chipboard

45
Q

Finishing materials made from vegetable fibers such as corn and sugarcane stalks pressed into sheets; not very strong but has good insulating properties; it is usually used for ceiling only.

A

Fiberboard
4’x8’ (1220mmX2440mm)
3/16” thk (4.5mm); 1/4” thk (6mm); 1/2” thk (12mm); 3/4” thk (19mm)

46
Q

Is manufactured from wood, straw, bagasse pulp pressed into boards with or without holes or slots.

A

Acoustic fiber board

1/2” - 2” thk (12mm to 50mm) in 1/2” (12mm) increments

47
Q

Brand names of fiber boards:

A

CELOTEX, CANEX, HOMASOTE, PHILTEX, BONOTEX

48
Q

Non-combustible building board with a gypsum core enclosed in tougfh, smooth paper. It is designed to be without addition of plaster for walls, ceilings or partitions; “dry wall construction”-where plaster is eliminated.

A

Gypsum board

49
Q

Brand names for Gypsum board:

A

BORAL distributed by Riviera Home Improvements Inc.

ELEPHANT by A.V.D Marketing

50
Q

Type of gypsum board used to save space; used as a base in a multi-ply construction of self-supporting (studless) gypsum walls.

A

Coreboard

51
Q

Gypsum board for use in fire-rated assemblies.

A

Type-X Gypsum board

52
Q

This type of gypsum board used in fire protection and bracing of exterior frame walls.

A

Gypsum Sheathing

53
Q

This type of gypsum board used as a permanent form in the castling of gypsum concrete roof decks.

A

Gypsum formboard

54
Q

This board is comprised of 72% portland cement, 20% mineralized cellulose fibers derived from recycled materials, and 8% calcium carbonate.

A

Fiber-cement board

55
Q

Board made of small wood chips and base materials including cotton stalk, rice straw, bagasse, conventional wood chips and sawdust that have been pressed and glued together.

A

Particle board

56
Q

Consist of finished lumber which is further cut and processed at a lumber mill. It includes doors, windows, mouldings, trim and other ornamental forms of wood.

A

Millwork

57
Q

How to purchase lumber from a hardware

A

Even numbers in feet

58
Q

Shortest lumber length in the market

A

8’

59
Q

For lumbers, which is not available in the market

A

1”x1”x12’

60
Q 
Which is not a substrate for plastic laminates?
MDF
Chipboard
Gypsum
Plywood
A

Gypsum

61
Q 
Which has no melamine form?
MDF
Plywood
Compact board
Hardboard
A

Hardboard

62
Q

Estimate number of plywood boards for a 3m X 6m ceiling

A

7

63
Q 
Which is not a commercial thickness of plywood?
3/8
5/8
3/16
1/2
A

5/8”

64
Q 
Which commercial material is applicable for exterior walls?
3/4" MDF
1" Plywood
1/2" Gypsum board
1 5/8" Float glass
A

1” Plywood

65
Q 
A vendor for termite protection
Termicide
Mapecon
Pestiway
Termacons
A

Mapecon

66
Q 
What is the best material to create a v-joint?
Particle board
Hardiflex
Plywood
MDF
A

Plywood

JECA: Building Materials & Construction (2 decks)

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