ITAZ RQ: Roofing Flashcards
Roofing:
Is a sloped roof waterproof? Explain.
- Sloped roofs are not water proof.
- They are designed to shed water like a series of umbrellas.
- They are not designed to control standing water.
Roofing:
Why can a minor leak be more of a problem than a major one?
- A minor roof leak may cause considerable damage before it is noticed.
Roofing:
Why is there an increased potential for failure on a complex roof?
- More transitions and flashing required resulting in more
opportunities for water penetration.
Roofing:
Which sides of a roof will wear faster in climates where ultraviolet light is the main aging factor?
- South & West
Roofing:
Once a roof is installed, can you see all the important installation details?
- No. May components and details are concealed.
Roofing:
Anything that restricts the drainage of water is a vulnerable area. Give 11 examples.
- Butterfly roofs
- Wide chimneys near the lower edge of the roof
- Chimneys in valleys
- Skylights
- Drains from upper roofs discharging on to lower roofs
- Changes in material
- Equipment that obstructs drainage
- Complex flashing details
- Asymmetric valleys
- Repaired areas
- Changes in slope
Roofing:
Which of the following roofs is prone to ice dams? a) A steep sloped roof with a wide soffit, b) a low slope roof with a narrow soffit, c) a low slope roof with a wide soffit
- c) a low slope roof with a wide soffit
Roofing:
What are the three possible actions to minimize ice damming?
- Upgrade insulation and ventilation
- Add eave protection
- Add electric heating cables
Roofing:
What are the drawbacks to adding a second layer of roofing over a first?
- The dead load is increased
- Nails may not be long enough to penetrate the roof sheathing
- Old flashings may not be replaced
- The roof sheathing cannot be properly inspected
- Roofing materials may not dry properly
Roofing:
Where can you look on a roof to determine the number of layers?
- Look at the gable ends and lower edges of the roof, at flashings or
- Lower edges of the roof
- Flashings
- Nail pattern protruding through the sheathing from the underside
Roofing:
What is the typical life expectancy of an asphalt shingle roof?
- 12-25 years
Roofing:
What is the maximum recommended number of layers of asphalt shingles?
- 2
Roofing:
One common failure mode for asphalt shingles is cupping. List 5 others.
- Clawing
- Cracking
- Blistering
- Loss of granular material
- Tearing off
Roofing:
What is the implication of driving nails or staples too deep?
- They may penetrate the sheathing causing potential for water leakage.
Roofing:
Name three poor slate repair methods.
- Face nailing new slates
- Replacing slates with metal or other roofing materials
- Covering the damaged area with asphalt
Roofing:
List two ways that clay tile roofs fail.
- Improper installation
- Tiles cracked or broken
- Tiles pitted or spalling
- Tiles Missing
- Fastener problems
- Flashing problems
- Underlying membrane problems
- Previous repairs
Roofing:
You should always walk on clay tile roofs. (True or False)
- False
Roofing:
What material might concrete tiles be confused with?
- Clay, slate, wood
Roofing:
Concrete tiles are often laid over a waterproof membrane on the roof. (True or False)
- True
Roofing:
Should inspectors walk on concrete tile roofs?
- No
Roofing:
How are metal roofs attached to the home?
- Nailed, screwed or clipped to plywood sheathing, wood battens or steel battens
Roofing:
Another name for roll roofing is…
- Selvage roofing
Roofing:
What are two common failure modes for roll roofing?
- Cracking
- Blistering
- Buckling
- Loss of granular material
Roofing:
Is it more common for a roof to leak at the flashings or at the other areas in the roof surface.
- Flashings
Roofing:
List four common flashing materials
- Felt paper
- Rubberized asphalt
- Rubber
- Metal
- Roll Roofing
Roofing:
List five areas where flashings are found.
- Valleys
- Chimneys
- Pipes or stacks
- Roof/wall instersections
- Sloped roofs with intersect flat roofs
- Skylights
- Eaves
- Rakes
- Hips and ridges
Roofing:
Are valley flashings a watertight flashing or are they a shedding type of flashing?
Shedding
Roofing:
Why should open valleys widen at the bottom? (Two reasons)
- To prevent water buildup since the bottom of roofs collect more water
than the top - So they are less likely to collect snow (resulting in ice damming)
Roofing:
What are the two types of Closed Valleys?
- Closed cut or half woven
- Fully woven
Roofing:
What are the two common materials that are used for open valley flashing?
- Metal
- Roll Roofing
Roofing:
Why should you never walk up a valley?
You’ll damage the flashing
Roofing:
What is the best spot from which to inspect the installation of the valley flashing?
- From the eaves
Roofing:
What are the implications of a valley flashing problem?
- Leakage
Roofing:
On chimney flashings, is caulking an acceptable substitute to letting the flashing into the mortar joints?
- No.This will be an ongoing maintenance problem.
Roofing:
Some ridge flashing systems have a second function, not related to keeping the roof watertight. What is it?
- Ventilation of the roof space
Roofing:
There are two types of double glazing systems on skylights. Hermetically sealed and ….
- Ventilated
Roofing:
Which type of skylight is most likely to be successful, a skylight mounted on a curb or a skylight mounted directly on the roof?
- Curb
Roofing:
Can ice damming be an issue on skylights
- Yes
Roofing:
During an inspection of a skylight, you should never lift on the edge of the skylight. (True or False)
- False. You should, carefully.
