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									Inspecting Roofs Part 2
Common Types of Roof shingles
 Asphalt (composition) shingles
      Largest market share
      Low cost & acceptable life span
   Slate shingles
      Hard, dense stonel (last 75 years or more if well constructed))
   Clay & concrete tile
   Wood shingles & shakes
      Once extensively used, but less so now due to fire hazard
   Metal shingles
      Variety of colors and finishes
      Small market share
Typical valley and roof detail of
         underlayment
Typical Valley Treatments
(Shingles)
 Types
    Open valley
       Exposed to view

       Provides smooth and rapid discharge of water

    Woven valley (closed valley)
       More layers of roofing, more durable than open valley

    Closed-cut valley (combination open and woven)
       Resistant to roof traffic

       Most commonly used
Open-valley flashing: rolled roofing
Open-valley:
Sheet metal
flashing
Woven valley
Closed-cut
valley
Ridge and hip conditions
 Ridge and hip conditions occur where two
  sloping roofs meet
   Water   sheds away from ridge

 Type of shingle (ridge cap)
   Special ridge shingle
   Fabricated from standard shingle
Ridge caps from standard shingle
Ridge caps on hip roof
Drip-edge (perimeter flashing)
Step flashing where sloped roof
meets vertical wall
Flashing at chimney: Apron
flashing at low side
Flashing at chimney: step flashing
at sidewalls
Wood Shingles & Shakes
          (sawn)       (hand split)

 Installed over solid or spaced plank sheathing
 Interlayment (felt) is laid in between each
  course.
 Some curling & lifting with wet/dry changes is
  normal.
 Inspection from INSIDE is critical—leakage
  will show there
Wood Shingles & Shakes

               Typical Problems:

               •Rot and deterioration
               •Loose or missing pieces
               •Mildew/moss
               •Water penetration
General Roof Reporting Methods
 Identify:
      Type & approximate age (ask homeowner)
      Number of layers

 Condition:
      Satisfactory = roof covering will last over 5 yrs
      Marginal = less than 5 yrs life remaining
      Poor = replace soon (major repairs required)

								
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