Step2Study

CSLB C-39 Roofing Contractor practice questions

207 free questions with answers and explanations.

Practice test
  1. 101.A roofer is installing hip and ridge cap shingles over asphalt shingle roofing. What is the correct nailing practice for these cap shingles?Steep-Slope Roofing
  2. 102.A roofer is completing seams on a fully adhered EPDM membrane roof. Which material is used to permanently bond the overlapping edges of adjacent EPDM sheets together?Low-Slope Roofing
  3. 103.A chimney measures 36 inches wide on the upslope side of a composition shingle roof. Per code, what flashing detail is required at the high side of this chimney due to its width?Flashing, Ventilation and Insulation
  4. 104.A roofing contractor is designing a balanced attic ventilation system using both soffit (intake) and ridge (exhaust) vents. To prevent airflow short-circuiting and ensure the attic ventilates properly, how should the total required net free ventilating area generally be distributed?Flashing, Ventilation and Insulation
  5. 105.A contractor is roofing a home in a region subject to ice damming. Per California Building Code requirements for steep-slope roofs in these areas, self-adhering ice barrier membrane must extend from the eave edge to a point how far inside the exterior wall line?Steep-Slope Roofing
  6. 106.A general contractor is comparing two white TPO roof membranes for a cool-roof project. Membrane A has high solar reflectance but low thermal emittance, while Membrane B has both high reflectance and high emittance. Why does Membrane B achieve a higher Solar Reflectance Index (SRI) than Membrane A?Low-Slope Roofing
  7. 107.A roofer installs a 45-degree wood cant strip at the base of a parapet wall before applying modified bitumen base flashing up the wall. What is the primary purpose of the cant strip?Low-Slope Roofing
  8. 108.An inspector is checking a termination bar securing the top edge of a mechanically attached TPO membrane at a wall termination. Per typical manufacturer specifications, fasteners in the termination bar should be spaced no more than how far apart on center?Low-Slope Roofing
  9. 109.An elastomeric roof coating is applied at 24 dry mils and loses approximately 3 mils per year due to UV exposure and weathering. The manufacturer recommends recoating once thickness drops to 12 dry mils. In how many years should the recoat be scheduled?Low-Slope Roofing
  10. 110.A roofing crew is installing standard asphalt strip shingles on a normal-slope residential roof in a non-high-wind area. Per manufacturer and code guidelines, how many nails should be driven per shingle?Steep-Slope Roofing
  11. 111.Per California Plumbing Code requirements for secondary (overflow) roof drainage, where must the inlet of the overflow drain or scupper be positioned relative to the low point of the roof when the primary drainage system is functioning properly?Low-Slope Roofing
  12. 112.A roof plan specifies a minimum slope of 2 percent for positive drainage on a low-slope built-up roof. What is this slope equivalent to in inches per foot?Low-Slope Roofing
  13. 113.A standing-seam metal roof panel has an overall width of 36 inches but only 34 inches of effective coverage due to seam overlap. The roof width to be covered is 68 feet (816 inches). How many panels are required?Estimating and Planning
  14. 114.A roofer is building a cricket to divert water toward a drain located 40 feet from the cricket's high point. Code requires a minimum slope of 1/4 inch per foot. What is the minimum required drop in elevation from the high point to the drain?Low-Slope Roofing
  15. 115.A contractor is installing a built-up roof system using a cold-applied (cutback) adhesive process instead of hot asphalt mopping. What is a primary advantage of this method on an occupied building?Low-Slope Roofing
  16. 116.A building is located in a high-wind exposure zone requiring enhanced mechanical attachment of a TPO membrane. Field zone fastening is 1 fastener per 2 sq ft, while the corner zone requires 1 fastener per 0.5 sq ft. For a 10 ft x 10 ft corner zone, how many fasteners are required?Low-Slope Roofing
  17. 117.A contractor is installing standard three-tab asphalt shingles with a 5-inch weather exposure on a roof section with a slope length of 30 feet from eave to ridge. How many courses of shingles are required to cover this section?Estimating and Planning
  18. 118.In a low-slope roof assembly for a building in a cold winter climate, where should the vapor retarder be positioned relative to the rigid insulation to minimize the risk of condensation forming within the roof assembly?Low-Slope Roofing
  19. 119.Per the California Plumbing Code, an overflow scupper's inlet (flow line) must be set at what minimum height above the low point of the roof surface to ensure the primary drainage system functions before the overflow system engages?Low-Slope Roofing
  20. 120.A designer must size two overflow scuppers to evenly split roof drainage duty for a 3,000 sq ft roof area during a 4 in/hr design rainfall event. The manufacturer's scupper sizing chart indicates that at a 4 in/hr rainfall rate, a scupper with a 4-inch opening height requires 1 inch of width for every 150 square feet of roof area drained. What width should each of the two scuppers be?Low-Slope Roofing
  21. 121.A roofer plans to install aluminum step flashing directly in contact with existing copper valley flashing on a re-roof project. What problem is most likely to occur?Flashing, Ventilation and Insulation
  22. 122.An attic has a floor area of 2,400 square feet and will be vented using the 1/300 ratio, split evenly between soffit intake and ridge exhaust. If the ridge vent product provides 18 square inches of net free area per linear foot, how many linear feet of ridge vent are required to meet the exhaust-side requirement?Flashing, Ventilation and Insulation
  23. 123.At a roof-to-wall intersection, base flashing is installed integrated with the roofing membrane and turned up the wall surface. What is the primary function of the counter flashing installed above it?Flashing, Ventilation and Insulation
  24. 124.Title 24 sets a lower minimum aged solar reflectance for steep-slope roofs (0.20) compared to low-slope roofs (0.63). What is the primary reason for this difference?Flashing, Ventilation and Insulation
  25. 125.A contractor is building a cricket (saddle) behind a masonry chimney on a composition shingle roof. To properly divert water around the chimney, the cricket ridge should be constructed with a slope that:Flashing, Ventilation and Insulation
  26. 126.California's Title 24 cool roof requirements reference 'aged' solar reflectance values rather than initial (as-installed) values. Per Cool Roof Rating Council (CRRC) protocols, over what exposure period is this aged reflectance value determined?Flashing, Ventilation and Insulation
  27. 127.A contractor is installing a powered attic ventilator (PAV) rated at 1,200 CFM. Compared to a passive, wind-driven ventilation system, why must the net free intake area be carefully verified when using a powered fan?Flashing, Ventilation and Insulation
  28. 128.A ventilation product is rated with a net free area (NFA) of 50 square inches per linear foot. If a contractor installs 24 linear feet of this vent along a ridge, how many square feet of net free area does the installation provide?Flashing, Ventilation and Insulation
  29. 129.Under Title 24 prescriptive requirements, a builder is installing ceiling insulation in a new wood-framed attic assembly for a single-family residence in most California climate zones. What is the typical minimum required insulation value for this application?Flashing, Ventilation and Insulation
  30. 130.A mason is preparing a masonry chimney to receive counter flashing using a reglet method instead of surface-mounting the flashing on top of the mortar. What is a reglet?Flashing, Ventilation and Insulation
  31. 131.A custom home builder is specifying a new roof system that needs to be highly durable, fire-resistant, and offer a natural, rustic aesthetic. Which roofing material best fits these criteria?Steep-Slope Roofing
  32. 132.A roofing crew is installing 16-inch wood shakes on a roof with a 7:12 slope. They are using a standard single-coverage application. What is the maximum exposure that should be used for these shakes?Steep-Slope Roofing
  33. 133.A roofing contractor is installing a new asphalt shingle roof on a residential property. The roof has a 6:12 slope. To ensure proper drainage and weather resistance, what is the minimum required headlap for standard asphalt shingles?Steep-Slope Roofing
  34. 134.A roofing inspector is examining a newly installed slate roof. The slates are 18 inches long, and the roof has a 5:12 slope. To calculate the exposure, the side lap of the slate needs to be confirmed. What is the typical minimum side lap required for standard slate roofing tiles?Steep-Slope Roofing
  35. 135.A roofing crew is installing a new wood shake roof on a building in a high-wind zone. To ensure maximum wind resistance, what is the recommended minimum number of fasteners per shake?Steep-Slope Roofing
  36. 136.A roofing contractor is preparing to install a new open metal valley on an asphalt shingle roof. To ensure adequate water flow and prevent debris accumulation, what is the minimum recommended width for the metal valley at its narrowest point (e.g., at the top of the valley)?Steep-Slope Roofing
  37. 137.A roofing crew is installing clay roofing tiles on a residential property. The roof has a pitch of 5:12. According to standard practice for tile roofs, what is the recommended minimum headlap for these tiles to ensure proper water shedding and weather resistance?Steep-Slope Roofing
  38. 138.A contractor is installing a new asphalt shingle roof. To ensure proper fastening and prevent blow-offs, how far from the bottom edge of the shingle should the nails be placed?Steep-Slope Roofing
  39. 139.A roofer is installing a new slate roof. The slate tiles are 18 inches long, and the roof has a 6:12 slope. Per good roofing practice and building codes, what is the minimum required headlap for these slate tiles?Steep-Slope Roofing
  40. 140.A roofing inspector is examining a newly installed slate roof. To ensure proper installation and longevity, what is the minimum acceptable side lap for individual slate tiles, regardless of the roof's slope?Steep-Slope Roofing
  41. 141.A roofer is preparing to install standard 5-V Crimp metal roofing panels on a residential property. What is the minimum recommended roof slope for this type of exposed fastener metal panel system to ensure proper water shedding?Steep-Slope Roofing
  42. 142.A roofing crew is installing 16-inch wood shakes on a roof with a 7:12 slope. They are using a single-coverage application, which is less common but specified for this project. What would be the maximum recommended exposure for these 16-inch wood shakes in a single-coverage application on this slope?Steep-Slope Roofing
  43. 143.A roofing contractor is installing new wood shakes on a roof with a 6:12 slope. The shakes are 18 inches long. According to standard practice for single coverage, what should be the maximum weather exposure for these wood shakes?Steep-Slope Roofing
  44. 144.A homeowner wants to install a new high-quality metal roof system that offers superior durability, energy efficiency, and a traditional aesthetic for their custom-built home. Which of the following metal roofing types would best meet these requirements?Steep-Slope Roofing
  45. 145.A roofer is installing a new asphalt shingle roof and needs to properly flash a pipe penetration. The pipe has a diameter of 4 inches. What is the generally accepted minimum width of the flange on a pipe boot or flashing collar, extending over the shingle course below, to ensure adequate waterproofing?Steep-Slope Roofing
  46. 146.A roofing contractor is preparing to install asphalt shingles on a roof with a 5:12 slope. What is the minimum recommended headlap for standard three-tab asphalt shingles on this roof?Steep-Slope Roofing
  47. 147.A roofing contractor is tasked with installing a new standing seam metal roof on a commercial building. To allow for thermal expansion and contraction of the metal panels while maintaining wind uplift resistance, which type of clips should be used to fasten the panels to the roof deck?Steep-Slope Roofing
  48. 148.A contractor is installing a new roof on a building where a skylight penetrates the roof plane. Which type of flashing system is most critical to ensure a watertight seal around the entire perimeter of the skylight?Steep-Slope Roofing
  49. 149.A homeowner wants to install a new high-quality metal roof system on a custom home. Which of the following metal roofing materials offers the best combination of longevity, corrosion resistance, and aesthetic appeal, despite its higher cost?Steep-Slope Roofing
  50. 150.A contractor is installing a new roof on a building where a chimney penetrates the roof slope. To ensure a watertight seal around the chimney, which type of flashing is specifically designed to be integrated with the shingle courses, allowing for movement between the roof and chimney?Steep-Slope Roofing