Roofing 110201a Flashcards
Self preparation questions
How many sloping sides do these roofs have?
Cottage (hip) Roof
Gable Roof
Gambrel Roof
Mansard Roof
Cottage (hip) Roof - 4
Gable Roof - 2
Gambrel Roof - 4
Mansard Roof - 8
How would you recognize a Butterfly roof?
It’s an inverted Gable Roof
Why is a dome roof so special in it construction?
It doesn’t need a central supporting structure
What is meant by these terms:
Span
Slope
Rise
Run
Span - The distance from one outer edge to the other
Slope - A ratio expressed as rise over run
Rise - The vertical measurement from the peak
Run - The horizontal measurement. Equals half of the Span
What is meant by 1:3 slope?
A rise of 1 to a run of 3
What is steeper 12” on 12” or 16” on 12”?
16 on 12
What is the noblest metal used in roofing?
Copper number 8
What are the most common metals used for roofing today?
Aluminum, Copper, Galvanized Iron
What is meant by BUR?
Built-up Roofing
What is the top coat of a BUR called?
The flood coat (asphalt or tar)
On a lap seam the hole is larger for the fastening device. Why?
For expansion and contraction
What are the different Batten seams and how do they work?
Under braking the metal on alternate batten
What is the Sheet Metal workers responsibility
Coping and counter flashing
Where is step flashing used and what size should they be?
Where a roof meets a wall 3”x3”x6”
Where is counter flashing used?
Over the base or step flashing
Why are cricket or saddles used?
To prevent water from pooling
Where are raggle or (Reglet) used and how?
A slot in a masonry wall used to hold a flashing in place
What is the purpose of a gravel stop?
Prevent gravel and tar going over the edge
What are Hip and Ridge flashing used for?
To cap the peak of a roof
What is a scupper and where is it located?
A hole through a parapet wall used to drain water
What is a leader head?
A conductor head used to collect water under the scupper
What size should pitch pans or (Gum Box) be?
4” x 4”
What is the purpose of a through wall flashing?
Prevents moisture from entering the building
Curbs vertical height must be no less than what height?
9” or 225mm
All holes cut in steel Decks must reinforced after what sizes?
8”
Steep Roof construction is generally specified when the roof area is relatively small and has a slope that exceeds what?
1:4
Flat roof decks are __________________ to allow for _______________.
sloped
drainage
Short walls built around the perimeter of a building are called?
parapet walls
A _____________ roof has 2 sloping sides
gable
A hip roof has __________________ sloping sides.
4
______________ is the distance from one outer edge of a roof to the opposite outer edge.
Span
The roof triangle consists of ______________, ______________ and ___________.
Slope
rise
run
Rise is the _____________ measurement when expressing slope on a roof.
vertical
______________ is the horizontal measurement when expressing slope on a roof
Run
3 most common materials used for roofing are:
Aluminium
Cooper
Galvanized
Corrugated panels used for either roofing or siding must be laid ____________.
opposite the direction of the prevailing wind
A process that degrades metal electrochemically __
galvanic corrosion
A type of roof that does not require a central supporting structure ______
dome
Metals are classified by their nobility, which metal is more noble – Steel or Copper
Cooper
BUR stands for?
built up roofing
All building material will _________ and _____ as the temperature changes.
expand
contract
What type of seam is preferred as is makes allowances for expansion with the wood being tapered?
batten
Valley flashing can be installed as ________, ______ or _______ valley
open
closed
woven
What is required when a roof surface meets a wall or chimney ___________
flashing
________________ flashing is required to cover the top edge of base or step flashing.
Counter
When a chimney is 30” or wider, a _________ is provided at the top side or back.
cricket/saddle
What type of flashing is provided on the top surface of a wall and comes with a drip edge?
coping
To prevent tar and gravel from going over the edge of a roof, ________ flashing is used.
gravel stop
A ____________ is a hole through the parapet wall to allow water to drain off the roof.
scupper
If a 2” gas line penetrates the roof, what is the minimum size pitch pan that can be used _______________. What if there were 2-2” gas lines _______________________.
6 x 6
10 x 6
Sides on a gum box must be a minimum of __________ high.
4”
Galvanic corrosion can be reduced by insulating the two metals from each other, give 3 examples of material that can be used as insulation
- heavy tinning of ferrous metals
- quality moisture proof building paper
- felt and heavy coat of asphalt paint.
What happens to aluminum when it comes in contact with concrete ______.
deteriorates
If the span of a roof is 30’, what is the run _____________________.
15’ (half of the span)
What metal will expand the most as the temperature changes ____________________
zinc
What type of flashing is used to cap the peak of a roof?
ridge and hip flashing
