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BC > Chapter 7 > Flashcards

Chapter 7 Flashcards

1
Q

Standard tensile strength of wood

A

considered about 700 PSI

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2
Q

Dimensional lumber is available in lengths from

A

8 to 24 feet

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3
Q

Moisture content of structural lumbar

A

19 percent specific gravity

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4
Q

the allowable compressive strength parallel to the grain

A

Varies from 325 to 1,700 PSI

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5
Q

Engineered wood advantages are 2

A

Strength

Cost efficiency

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6
Q

Engineered wood disadvantages

A

Quick and unpredictable failure in fire conditions when unprotected

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7
Q

what joint is uses when is easy to produce but can not be used where tensile stresses will be transmitted along the length of the beam

A

Butt Joint

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8
Q

Scarf joint and finger joints are used when

A

to Transmit tensile stresses

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9
Q

what beam are used frequently in heavy timber construction where greater length components are required
Glulam beams are used

A

Glulam beams

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10
Q

Uses sheets of veneer peeled from the outer portion of a log

A

LVL

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11
Q

LVL is used in I joist and beam sections that are

A

1 3/4 to 3 1/2 inches thick

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12
Q

is Made from veneers that are not uniform as those used LVL

A

PSL (Parallel strand lumber)

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13
Q

PSL standard sizes range from

A

2 to 8 feet in length

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14
Q

what is the strongest out of the three SCL Products

A

PSL

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15
Q

is made with long strands of wood up to 12 inches

A

LSL

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16
Q

LSL is

A

Typically used for short span beams and columns

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17
Q

As an alternative to preservative treated lumbers and not intended to be used in the structural framing of a building

A

Thermoplastic lumber is developed

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18
Q

Flame spread rating of Thermoplastic lumber is

A

80

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19
Q

3 Types of Nonveneered panels

A

Oriented strand board

Particleboard

Waferboard

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20
Q

OSB is Widely used for

A

Sheathing and subflooring in wood frame buildings

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21
Q

Particleboard is used for

A

Flooring in manufactured and mobile homes

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22
Q

Outer wood panels usually OSB with plastic foam core with the foam core can be up to 1 foot thick

A

SIP’s

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23
Q

new developments include the use of foams such as ________instead of polystyrene to increase fire resistance

A

Expanded polyurethane

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24
Q

what can be used to increase energy efficiency

A

SIPS

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25
Q

the inner core of a sip can be up to

A

1 foot

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26
Q

4 Materials used for Firestopping

A

2 inch Nominal lumber

Gypsum board

Cement fiber board

Batts or blankets of mineral wool glass fiber or other approved materials

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27
Q

The usual requirements for fire stopping in attic space is

A

the attic space be subdivided into areas of 3,000 square feet

28
Q

what is used to increase the insulative properties of a building

A

Exterior insulation and Finishing systems (EIFS)

29
Q

Noncombustible materials used for insulation include (3)

A

Glass wool and rock wool in form of batts or blankets with combustible paper or foil coverings

Fiberglass

Some older vermiculite and batt insulation that by contain asbestos

30
Q

Loose fill materials used for insulation are (3)

A

Granulated rock wool

Mineral wool and glass wool wither blown into stud spaced on manually packed

Cellulose fiber and shredded wood, treated with water soluble salts to reduce combustibility it it will slowly smolder.

31
Q

Two Types of Solid Fill foam insulations are

A

Urea formaldehyde foam

Polyurethane foam

32
Q

Brick or stone veneers alone dose not affect _____ but dose add ______

A

Fire behavior

Insulating value of the wall

33
Q

Brick or stone veneers must be tied in at intervals of

A

16 inches

34
Q

A typical means of adding or increasing fire resistance is through the use of

A

5/8 inch gypsum board attached to the studs and ceiling joist

35
Q

innovations intended to reduce costs and improve efficiency often do so at the cost of

A

Safe fire fighting operations

36
Q

Materials used as manufactured components are (4)

A

Adhesives

Dimensional Lumber

Meal Fasteners

Panels

37
Q

a grade stamp on the back of structural panel indicates

A

Its intended structural application and its suitability for exposure to water

38
Q

Changing collapse time frames is particularly relevant in

A

Wood constructions buildings

39
Q

Pyrolysis begins

A

At a temperature somewhere below approximately 392 degrees F

40
Q

The heat of combustion of a fuel is

A

Total amount of thermal energy that can be release if the fuel is completely burned and is measured in BTU’S

41
Q

Surface to mass ratio of wood has

A

Great significance in fire fighting

42
Q

Two main types of fire retardant treatments are

A

Surface coating

Pressure impregnation

43
Q

Pressure impregnation of wood Process 4 steps

A

1 wood is placed in a large vacuum cylinder

2 the vacuum draws air out of the cells of the wood

3 A solution containing the fire retardant chemical in introduced into the cylinder and the cylinder is pressurized

4 the pressure forces the fire retardant chemicals into the cells of the wood

44
Q

3 Disadvantages and limitations to fire retardant treatments include

A

Water soluble chemicals are not approved for use in applications exposed to uncontrolled or high humidity

Compliance with approved usage cannot be proven after application

Fire retardant treatment reduces wood strength allowable stresses must be matched to the values indicated after treatment

45
Q

6 Inorganic or organic salts used for fire retardant treatments are

A

Ammonium phosphate

Ammonium sulfate

Boric acid

Zinc chloride

Sodium dichromate

Borax

46
Q

Applicable Requirements for ignition resistant construction

A

Fire resistant roof coverings to protect against flaming embers

An exterior wall that is either noncombustible or that has a 1 hour fire resistive rating when exposed from the outside

Limitation on the size of attic and under floor vents and their protection with corrosion resistant screens

47
Q

4 Factors used to evaluate the hazard severity in a given location include

A

Ground slope
Clear space around property
water supply
climate

48
Q

Wood framing systems most frequently encountered can be broadly classified into to basic types

A

Light wood framing

Heavy timber framing

49
Q

what display greater structural endurance under fire conditions than members used in light frame constructions

A

Heavy Timbers

50
Q

Platform construction is more prone to shrinkage than balloon framing because

A

platform framing makes use of more horizontal member in its frame than balloon frame buildings

51
Q

3 Other types of wood construction

A

Pole construction

Log construction

Prefabricated panel construction

52
Q

The wood shrinkage in platform construction can produce

A

Greater vertical movement and then intern cause cracking of plaster and misalignment of door and window openings

53
Q

3 Identifiable features of heavy timber framing are

A

Trusses or beams can be used to support the roof

The exterior walls are non load bearing panels with exterior siding that may include any of seral materials including corrugated sheet metal

Internal support columns are not less then 8x8 and the beams are not less then 6x10 except in roof beams

54
Q

Two primary differences between type 4 and type 3

A

type 4 heavy timber has thicker dimensions of solid laminated wood structural members

Type 4 heavy timber dose not allow combustible concealed spaces

55
Q

Is a form of wood frame constructions with columns (post) and beam that use dimensions smaller than those used in heavy timbers

A

Post and beam framing

56
Q

the flanges of the i beam can be made of

A

Laminated veneer lumber or solid wood lumber

57
Q

Wood I beams are frequently used for

A

Floor joists and rafters in framing of roofs

58
Q

What is the primary safety limitation of engineered wood systems

A

The possibility of swift collapse under fire conditions

59
Q

Light wood frame trusses use a series of what nominal member that align in the same plane

A

2 Inches

60
Q

Heavy Timber trusses us members the size of

A

8 or 10 inches

61
Q

most common type of connector between heavy timber members are

A

Steel gusset plates with through bolts

62
Q

in modern construction what type of joints are used only in rare cases where designer desires a artistic or quaint appearance

A

Mortise and tenon joints

63
Q

what kind of connector is a Bolt with a thrust washer is run through the split ring to hold the members together

A

Split-ring connector

64
Q

what kind of truss uses a short circular piece of still within and between two adjacent wood members to transfer the load between the members r

A

Split ring truss

65
Q

Wood is uniquely vulnerable to deteriorations from 3 causes like

A

Insects
Decay
Shrinkage

BC (10 decks)

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