Ch 7 - Wood Construction

Question 1

Engineered wood pros & cons

Answer 1

Advantages: strength and cost efficiency
Disadvantages: quick and unpredictable failure under fire conditions

Question 2

Glulam beams

Answer 2

Frequently used in heavy timber construction
React similar to solid Timbers under fire conditions
Fire has essentially no effect on adhesives used

Question 3

LVL - laminated veneer lumber

Answer 3

Sheets of veneer from outer portion of log, laminated in parallel alignment

Question 4

PSL - parallel strand lumber

Answer 4

Strongest of structural composite lumbers, heavy loaded columns and long spans

Question 5

Plywood

Answer 5

Several thin layers (veneers) glued together at right angles

Question 6

OSB

Answer 6

Long, strand like wood particles glued together and oriented in the same direction

Question 7

Particleboard

Answer 7

Wood particles bonded with synthetic resins
Not used for structural elements
Floors of mobile homes

Question 8

Composite panels

Answer 8

Face and back panel of OSB/plywood bonded to a central core material, typically plastic foam (polyurethane or polystyrene)

Question 9

R-value

Answer 9

A measure of the ability of a material to insulate

Question 10

Materials used for fire stopping

Answer 10

2 inch nominal lumber
Gypsum board
Cement board
Mineral wool & glass fiber insulation

Question 11

Required firestopping locations

Answer 11

Within stud walls at floor and ceiling
Connection point between vertical stud spaces and horizontal spaces
Between stair stringers
Behind fascia

Question 12

Exterior sheathing

Answer 12

Plywood, OSB

Question 13

Building wrap

Answer 13

Layer between the sheathing and the siding that acts as a vapor barrier

Question 14

Foam insulation

Answer 14

Glass wool or rock wool
Fiberglass
Noncombustible to slow fire spread in void spaces

Question 15

Siding materials

Answer 15

Aluminum
Vinyl
Asphalt shingles
Stucco
Wood shingles
Various levels of combustibility

Question 16

Brick or stone veneer walls

Answer 16

Must be tied to wood frame at 16 inch intervals
No structural support
May create void spaces between veneer and sheathing for fire spread

Question 17

Pyrolysis of wood begins at…

Answer 17

392°F

Question 18

Factors affecting combustion properties of wood

Answer 18

Ignition temperature
Heat of combustion
Surface to mass ratio
Fire retardant treatment of wood
Void spaces

Question 19

Ignition resistant construction

Answer 19

Fire resistant roof coverings
Noncombustible or fire rated exterior walls
Different than fire-resistive construction (structural members are not resistant)
Areas with wildland fires

Question 20

Ledger board

Answer 20

Horizontal framework member attached to beams to support floor joists, used in balloon frame

Question 21

Balloon frame

Answer 21

Wall studs are continuous from top to bottom

Question 22

Platform framing

Answer 22

Studs are not continuous
First constructed as a platform to attach studs, second floor platform attached to studs
Creates fire stops at each floor level

Question 23

Primary characteristics of heavy timber (type IV)

Answer 23

Thicker dimensions of structural wood members
Does not allow combustible concealed soaces

Question 24

Post and beam

Answer 24

No traditional stud wall construction
Larger dimension posts and beams
Posts usually exposed on interior, eliminating void spaces

Question 25

Structural collapse of wood construction

Answer 25

Light weight and engineered structural components highly susceptible to collapse under fire conditions