203c: Residential Roof Coverings

Question 1

Are roof coverings primary purpose for protecting a building from weather?

Answer 1

Yes

Question 2

Are there only sloped and flat roofs? (2 types)

Answer 2

Yes. Flat or sloped, doesn’t matter equal or unequal

Question 3

Are flat roof loads greatest at centre or perimeter?

Answer 3

Center

Question 4

Is roof sheathing structural or just for show?

Answer 4

Structural; part of framing

Question 5

What does 2R24 mean on a sheet of roof sheathing?

Answer 5

BINARY
2: horizontal edges must be supported (1 = no support)
R: roof
24: max span in inches (24”)

Question 6

Do h clips support sheathing edges between spans?

Answer 6

Yes

Question 7

Is roof sheathing similar to walls or floors?

Answer 7

Floors, t+g

Question 8

Does fibreboard shesthing need CONTINUOUS support at all edges?

Answer 8

Yes

Question 9

Why do vented roof panels make constructing more efficient?

Answer 9

OSB, vent space, and rigid insulation in one panel

Question 10

Do I e dams form at exterior walls on roof?

Answer 10

Yes, hot and cold surfaces produce a freeze thaw cycle; ice can form on overhang

Question 11

My roof is 30 years old, should I replace the shingles?

Answer 11

Probably. Lifespan of 20-40 years

Question 12

Architectural
3 tab
Interlock

Answer 12

3 shingle types

Question 13

Roof covering that gets rolled on

Answer 13

Roll roofing

Question 14

Gosh
Hexagon
Octagon
Half cove

Answer 14

5 shake styles

Question 15

1 Rough side and 1 sawn side on shake

Answer 15

Hand split shake

Question 16

Is metal roofing lapped?

Answer 16

Yes

Question 17

Can I put corrugated roofing on top of an existing roof?

Answer 17

Yes, to save removing the previous

Question 18

Do we need more strength in roofs with tile or slate roofing?

Answer 18

Yes because it’s heavier

Question 19

When might I use clear PVC roofing?

Answer 19

Greenhouses and other ag buildings, carports

Question 20

What are layers of asphalt bitumen and asphalt roofing felt for?

Answer 20

Built up roofing

Question 21

Bitumen waterproof?
Roofing felt reinforced?
gravel protects from sun?

Answer 21

Yes

Question 22

Do we need to flash the valley for drainage before installing shingles?

Answer 22

Yes

Question 23

Open valleys need 600mm wide sheet metal OR two layers of roll roofing?

Answer 23

Yes

Question 24

Can I butt my shingles at the ends at a closed valley?

Answer 24

No, needs to run underneath 300mm

Question 25

Does base flashing direct water away from a wall on a roof?

Answer 25

Yes

Question 26

Is step flashing the same as base flashing?

Answer 26

Can be. But is stepped up along a slope along the wall

Question 27

Do we need flashing to cover the top edge of base flashing?

Answer 27

Yes, counter flashing around an entire chimney for example

Question 28

Why do we build crickets?

Answer 28

To direct water away from a wall that blocks the slope of the roof from draining (ie. chimney)

Question 29

Does eave protection help moisture stay outside the building at building perimeter?

Answer 29

Yes. Prevents moisture from ice damming getting inside

Question 30

Does plumbing fixtures need 20”x20” flashing on the roof?

Answer 30

Yes

Question 31

Do we start shingles from the wave or the ridge?

Answer 31

Edge. Positive drainage from top of roof; shingles overlap the lower courses

Question 32

Do wood shingles need an air gap underneath?

Answer 32

Yes. Spaced decking let’s the wood shingles breathe on all sides

Question 33

Do we cap ridges and hips?

Answer 33

Yes

Question 34

Is roll roofing quick and inexpensive compared to shingles?

Answer 34

Yes