Roofing/flashing/chimneys Flashcards
What is the result of moisture being trapped underneath or within the layers of a built-up roof?
Blistering
Typically,no more than ___ of a wood shingle should be exposed to the weather.
1/3
What is the possible result if water ponding on a flat roof?
Reduced life expectancy
What is the difference between an open valley and a closed valley flashing?
Closed valley is covered with shingles
Clay tile roof should have how much overlap?
3”
What is the heaviest roof material per sq.ft .?
Slate /concrete tile
Wood shingle / shakes should be spaced how far apart ?
3/8”
Flat roofs-what is the most common cause of leaking
Parapet walls
What does water ponding cause ?
- shorten life expectancy
- promotes fungi and moss growth
- allows seepage
Flat roofs -what is the cause of blisters ?
Air and water trapped between layers
Asphalt shingle valley overlap required ?
12” cut or woven
Types of insulation used with a flat Roof?
- urethane
- fiberglass
- polystyrene
Cap flashing is required over a parapet wall ? T/F
True
A 3-tab asphalt shingle can be installed on pitches as low as 2/12, if the roof?
If there are two layers of roofing felt under the shingles
What is the most durable roof covering?
Slate
When does a build-up roofing need flood coating?
Tar paper is showing
Where is the roof most likely to leak when re-roofing?
Penetrations
A built-up roof having lap joint every 12” is a :
3ply
Wood shakes/shingles are best maintained by :
Applying a quality waterproof drake periodically.
Metal roofs are best protected by :
Properly maintained with paint
Which of the following is not suited to a roof with a 2/12 pitch?
Asbestos cement shingles
What does a drip edge do ?
Protects the parts below it like Te fascia ,siding ECT
Skylight curbing must extend above The roof a minimum of ?
4inches
What should you do if you come across a snow covered roof?
Note the snow and lack of visibility and access
