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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
the inner core of a sip can be up to
1 foot
26
4 Materials used for Firestopping
2 inch Nominal lumber Gypsum board Cement fiber board Batts or blankets of mineral wool glass fiber or other approved materials
27
The usual requirements for fire stopping in attic space is
the attic space be subdivided into areas of 3,000 square feet
28
what is used to increase the insulative properties of a building
Exterior insulation and Finishing systems (EIFS)
29
Noncombustible materials used for insulation include (3)
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
Loose fill materials used for insulation are (3)
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
Two Types of Solid Fill foam insulations are
Urea formaldehyde foam Polyurethane foam
32
Brick or stone veneers alone dose not affect _____ but dose add ______
Fire behavior Insulating value of the wall
33
Brick or stone veneers must be tied in at intervals of
16 inches
34
A typical means of adding or increasing fire resistance is through the use of
5/8 inch gypsum board attached to the studs and ceiling joist
35
innovations intended to reduce costs and improve efficiency often do so at the cost of
Safe fire fighting operations
36
Materials used as manufactured components are (4)
Adhesives Dimensional Lumber Meal Fasteners Panels
37
a grade stamp on the back of structural panel indicates
Its intended structural application and its suitability for exposure to water
38
Changing collapse time frames is particularly relevant in
Wood constructions buildings
39
Pyrolysis begins
At a temperature somewhere below approximately 392 degrees F
40
The heat of combustion of a fuel is
Total amount of thermal energy that can be release if the fuel is completely burned and is measured in BTU'S
41
Surface to mass ratio of wood has
Great significance in fire fighting
42
Two main types of fire retardant treatments are
Surface coating Pressure impregnation
43
Pressure impregnation of wood Process 4 steps
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
3 Disadvantages and limitations to fire retardant treatments include
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
6 Inorganic or organic salts used for fire retardant treatments are
Ammonium phosphate Ammonium sulfate Boric acid Zinc chloride Sodium dichromate Borax
46
Applicable Requirements for ignition resistant construction
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
4 Factors used to evaluate the hazard severity in a given location include
Ground slope Clear space around property water supply climate
48
Wood framing systems most frequently encountered can be broadly classified into to basic types
Light wood framing Heavy timber framing
49
what display greater structural endurance under fire conditions than members used in light frame constructions
Heavy Timbers
50
Platform construction is more prone to shrinkage than balloon framing because
platform framing makes use of more horizontal member in its frame than balloon frame buildings
51
3 Other types of wood construction
Pole construction Log construction Prefabricated panel construction
52
The wood shrinkage in platform construction can produce
Greater vertical movement and then intern cause cracking of plaster and misalignment of door and window openings
53
3 Identifiable features of heavy timber framing are
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
Two primary differences between type 4 and type 3
type 4 heavy timber has thicker dimensions of solid laminated wood structural members Type 4 heavy timber dose not allow combustible concealed spaces
55
Is a form of wood frame constructions with columns (post) and beam that use dimensions smaller than those used in heavy timbers
Post and beam framing
56
the flanges of the i beam can be made of
Laminated veneer lumber or solid wood lumber
57
Wood I beams are frequently used for
Floor joists and rafters in framing of roofs
58
What is the primary safety limitation of engineered wood systems
The possibility of swift collapse under fire conditions
59
Light wood frame trusses use a series of what nominal member that align in the same plane
2 Inches
60
Heavy Timber trusses us members the size of
8 or 10 inches
61
most common type of connector between heavy timber members are
Steel gusset plates with through bolts
62
in modern construction what type of joints are used only in rare cases where designer desires a artistic or quaint appearance
Mortise and tenon joints
63
what kind of connector is a Bolt with a thrust washer is run through the split ring to hold the members together
Split-ring connector
64
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
Split ring truss
65
Wood is uniquely vulnerable to deteriorations from 3 causes like
Insects Decay Shrinkage

BC (10 decks)

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