Building Construction

Question 1

What are the 6 types of roofs?

Answer 1

HBFAGS

Hip, Bridge, Flat, Arched, Gable, Sawtooth

Question 2

What does conventional construction utilize?

Answer 2

Structural members that depend on its size for strength (4x8)

Depends on its size for strength

Question 3

What does light weight construction utilize?

Answer 3

Does not derive the size of its members for strength. Strength is derived from multiple members that are under compression (top cord) and tension (bottom cord)

Question 4

What is the fire behavior of light weight construction?

Answer 4

Because it utilizes the sum of its member for strength, it can fail quickly. If one member fails, others may fail

Question 5

Size of light weight truss members

Answer 5

70 feet and typically comprised of 2x4s or 2x3s

Question 6

Conventional construction consists of

Answer 6

Minimum 2x4 and up

Question 7

Gable roof consists of

Answer 7

Conventional or ordinary construction utilizing Ridge board or rafters that cross the outside walls. Collar beam and ceiling joist

Question 8

Rafters on gable roof consist of

Answer 8

2x6 or larger and are usually 16 to 24 inches “on center”

Question 9

Metal Gusset Plates are what sizes typically

Answer 9

18 gauge steel plates that offer 3/8 inch penetration

Question 10

Strengths of conventional construction

Answer 10

utilizes ridge boards and rafters of 2 x 6 inches or larger. This type of construction will last
longer (compared to 2 x 4 inch trusses) when exposed to fire

the strong area of the roof are the ridge and the area where rafters cross the outside walls

Question 11

Hazards of conventional construction

Answer 11

2x4 rafters w/ no ridge boards may lead to early failure of roof

gusset plates can lead to early failure

when metal connectors fail, so will the wood members

Question 12

strength of hip roof

Answer 12

Ridge board, valley rafters, hip rafters, and the area where rafters cross the outside walls are areas of strength. In
conventional construction, ridges and rafters are 2 x 6 inches or larger.

Question 13

hazards of hip roof

Answer 13

roofs with steep pitch may require roof ladders and can be slippery and offer minimal footing when dry

Question 14

bridge truss roofs are found where

Answer 14

commercial buildings primarily constructed during the 1930s and 40s

Question 15

Which cord is under compression and which cord is under tension in a bridge truss roof

Answer 15

top cord compression and bottom cord tension

Question 16

if a bridge truss roof fails, it typically fails-

Answer 16

in sections

Question 17

hazards of bridge truss roof

Answer 17

the bottom
chords can be covered with sheathing or plywood) (and/or lath and plaster, etc. can be attached to the bottom of chord of
the trusses. These factors can contribute to early collapse of the trusses and roof.

Question 18

lumber size for bowstring arch roof types

Answer 18

2x12 or 2x14

Question 19

lamella arch roofs are commonly found where

Answer 19

gymnasiums, large
buildings used for recreational activities, large supermarkets, etc

Question 20

roof decking of lamella arch roofs is comprised of what

Answer 20

1 x 6 inch sheathing and composition roofing material

Question 21

total roof collapse will occur with if fire removes more than what percent of the roof of lamella arch roofs

Answer 21

20%

Question 22

ties truss arch roof types are identified by what

Answer 22

visible tie rods that pass through outside plates

Question 24

Light weight truss structural members can span how many feet

Answer 24

70

Question 25

Ridge board on a gable roof is typically what size

Answer 25

1x6

Question 26

Rafter size on conventional gable roof

Answer 26

2x6

Question 27

Bowstring lumber of arch truss

Answer 27

2x12 or 2x14

Question 28

Types of arched roofs

Answer 28

Bowstring, lamella, tied truss

Question 29

Beam size for panelized roof

Answer 29

6x36

Question 30

Common size of purlins on panelized roof

Answer 30

4x12

Question 31

Components of panelized roof

Answer 31

Beams (laminated, wood, or metal)
Purlins
2x4 inch joists
2 inch plywood decking

Question 32

Bottom chord of open web bar joists size

Answer 32

1/8 inch steel

Question 33

Web support size of open web bar joists

Answer 33

5/8 inch steel bar

Question 34

A steel or wood substructure roof covered by corrugated metal is called

Answer 34

Robertson decking

Question 35

Concrete tilt up can be up to how many stories

Answer 35

5 stories

Question 36

Gable:

            Rafters and “on center”

Answer 36

2x6 or larger
16 to 24in on center

Question 37

Bridge truss roof utilizes _____ sheathing

Answer 37

Diagonal