The Nrca Roofing Manual: Architectural Metal Flashing, Condensation And Air Leakage Control, And Reroofing

20 Questions | Total Attempts: 91

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The Nrca Roofing Manual: Architectural Metal Flashing, Condensation And Air Leakage Control, And Reroofing

Questions and Answers
  • 1. 
    For a metal to be approprietly considered a naturally weathering metal, the base metal itself must be able to oxidize sufficiently to form its own protective layer to withstand environmental exposures common to roof systems
    • A. 

      True

    • B. 

      False

  • 2. 
    Metal types used in the roofing industry include:
    • A. 

      Aluminum

    • B. 

      Aluminum steel

    • C. 

      Copper

    • D. 

      Copper-coated stainless steel

    • E. 

      Galvalume®

    • F. 

      Galvanized Steel

    • G. 

      Lead

    • H. 

      Lead-coated copper

    • I. 

      Prefinished aluminum

    • J. 

      Prefinished Galvalume®

    • K. 

      Prefinished galvanized steel

    • L. 

      Stainless steel

    • M. 

      Zinc, Zinc-tin-coated copper, Zinc-tin-coated stainless steel, Zinc-tin-coated steel

    • N. 

      All of the options are metal types used in roofing

  • 3. 
    Aluminized steel has a barrier layer of aluminum oxide that provides protection only in areas with uninerrupted aluminum coating, which means - cut edges are vulnerable.
    • A. 

      True

    • B. 

      False

  • 4. 
    Over time,  copper develops a bronze, brown or blue-green color resulting from the formation of a __________ layer of copper sulfate, referred to as "patina".
    • A. 

      Harmful

    • B. 

      Protective

    • C. 

      Volitile

    • D. 

      Insulating

  • 5. 
    Lead is extremely soft and can be formed by hand and is useful for flashing irregular shapes and junctures. Sheet lead has strong structural strength and puncture resistance.
    • A. 

      True

    • B. 

      False

  • 6. 
    Paint systems are characterized by performance measurements. Some of them are all of the following EXCEPT:
    • A. 

      Appearance and color durability (fading and chalking resistance)

    • B. 

      Film integrity and adhesion (peeling and chipping)

    • C. 

      Hardness (scratch resistance)

    • D. 

      Elongation

    • E. 

      Flexibility (which relates to formability of a coated metal)

    • F. 

      Chemical and general corrosion resistance

    • G. 

      Solar reflectance and thermal emittance

  • 7. 
    Galvanic Corrosion is:
    • A. 

      Accelerated corrosion of a metal because of an electrical contact with a more noble metal or nonmetallic conductor in a corrosive electrolyte

    • B. 

      The negative direction of electrode potential.

    • C. 

      The positive direction of electrode potential.

    • D. 

      A measurement under an open-circuit condition.

  • 8. 
    The following are potential causes of Oil Canning:
    • A. 

      Residual stress during coil production can contribute to camber, the deviation of a side edge from a straight line. This longitudinal curving will place additional stress on metal as it is pulled through a roll-forming machine, which attempts to form a straight edge on the panel.

    • B. 

      Slitting a master coil can release and redistribute stresses, especially if the slitter blades are out of adjustment or dull.

    • C. 

      Roll-forming equipment can cause oil canning. As metal is run through rolling stations, it is placed under stress and can stretch, particularly if the equipment is out of adjustment or operated beyond its limitations.

    • D. 

      All of the options are causes.

  • 9. 
    Clips are defined by the NRCA as a clip as an individual metal component installed at a predetermined locations behind the leading edge of a flashing metal used to engage and secure the sheet-metal flashings intermittently to the adjacent substrate or another metal component.
    • A. 

      True

    • B. 

      False

  • 10. 
    Shank nails are the most commonly used fastener when fastening sheet metal to wood. 
    • A. 

      True

    • B. 

      False

  • 11. 
    At copings, fascias and perimeter edge metal, the NRCA recommends that the edge metal extend below the joint between the top of a wall and wood nailer a minimum of ______ inches. This is based on how far water will move upward under pressure.
    • A. 

      1/2

    • B. 

      1

    • C. 

      2

    • D. 

      3

  • 12. 
    Joinery is the method of joining two or more pieces of sheet metal. This can be accomplished by all of the following EXCEPT:
    • A. 

      Mechanical fasteners

    • B. 

      Electromagnetic heat welding

    • C. 

      Crimping and locking

    • D. 

      Soldering or welding

  • 13. 
    Review the photo. The following is the name of the seam in the photo.
    • A. 

      Pipe Lock

    • B. 

      Pittsburgh Lock

    • C. 

      Single-Lock Standing Seam

    • D. 

      Overlap Standing Seam

  • 14. 
    A coping should have the following characteristics:
    • A. 

      Durable nonporous materials

    • B. 

      Compatibility with the adjacent materials; if not, an isolation sheet or coating may be required to separate incompatible materials

    • C. 

      Proper support—either continuous support, such as wood blocking, or intermittent supports

    • D. 

      Adequate joinery—to prevent moisture infiltration

    • E. 

      Proper slope—to drain water (preferably to the interior side) from the top surface

    • F. 

      Adequate overlap on each vertical face—to prohibit moisture infiltration

    • G. 

      Secondary, continuous sheet membrane liner to provide secondary weatherproofing unless weathertight joints, such as double-lock standing seams, are used

    • H. 

      Expansion/contraction capabilities

    • I. 

      Coping should have all of these options.

  • 15. 
    The following is best practice when determining  the types and dimensions of coping metals to use on a particular project.
    • A. 

      Metal choices are typically weather specific. Check your climate code for appropriate metal recommendations.

    • B. 

      Refer to the minimum metal thickness guidelines for flatness and weatherability - Copings in the NRCA manual

    • C. 

      Check with the contractor with the best gut feelings.

    • D. 

      Whichever metal allows the greatest profit on the job.

  • 16. 
    A Counterflashing is defined as a formed metal component secured on or into a wall or curb or to another component, such as a vent, conduit or mechnical unit, to cover and protect the upper edge of the membrane base flashing or underlying metal base flashing and its associated fasteners from mechanical damage and exposure to the weather
    • A. 

      True

    • B. 

      False

  • 17. 
    Review the image. This is an example of:
    • A. 

      Through-wall Reglet Receiver and Counterflashing

    • B. 

      Insert Reglet Receiver and Counterflashing

    • C. 

      Two-piece Surface-Mounted Receiver and Counterflashing

    • D. 

      Behind Cladding Receiver and Counterflashing

    • E. 

      One-Piece Surface-Mounted Counterflashing

  • 18. 
    The Metal Type and Recommended Minimum Thickness for Asphalt Shingle is:
    • A. 

      20-gauge galvanized steel, 20-gauge prefinished galvanized steel, 20-gauge stainless steel

    • B. 

      22-gauge galvanized steel, 22-gauge prefinished galvanized steel, 22-gauge stainless steel

    • C. 

      24-gauge galvanized steel, 24-gauge prefinished galvanized steel, 24-gauge stainless steel

    • D. 

      26-gauge galvanized steel, 26-gauge prefinished galvanized steel, 26-gauge stainless steel

  • 19. 
    Review the image. When installing Metal step flashing: 
    • A. 

      A = 2", B = 2", C = Length = Exposure + 4"

    • B. 

      A = 4", B = 4", C = Length = Exposure + 4"

    • C. 

      A = 4", B = 4", C = Length = Exposure + 2"

    • D. 

      A = 6", B = 6", C = Length = Exposure + 6"

  • 20. 
    Review the image and select the correct answer:
    • A. 

      A = Appropriate Fastener at 2" O.C., B = Gasketed Fastener at 12" O.C.

    • B. 

      A = Appropriate Fastener at 4" O.C., B = Gasketed Fastener at 14" O.C.

    • C. 

      A = Appropriate Fastener at 6" O.C., B = Gasketed Fastener at 18" O.C.

    • D. 

      A = Appropriate Fastener at 8" O.C., B = Gasketed Fastener at 20" O.C.

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