Arizona CR-42 Roofing License Exams — Arizona Licensed Roofing Contractor
1. Drip edges on steep slope roofs shall be mechanically fastened at a maximum spacing of
Answer: A
Drip edges on steep slope roofs shall be mechanically fastened at a maximum spacing of 12 inches.
Drip edges on steep slope roofs must be mechanically fastened at a maximum spacing of 12 inches to ensure proper installation and functionality. This spacing helps prevent water infiltration and enhances the overall durability of the roofing system.
A) 12 inches.
This option is correct as it aligns with industry standards that dictate a maximum spacing of 12 inches for mechanically fastening drip edges on steep slope roofs. This close spacing is crucial for maintaining the integrity of the roof and ensuring effective water drainage.
B) 18 inches.
This option is incorrect because a maximum spacing of 18 inches exceeds the recommended fastening distance for drip edges on steep slope roofs. Utilizing this spacing could lead to compromised structural integrity and increased risk of water damage.
C) 36 inches.
This option is incorrect, as a spacing of 36 inches is significantly larger than the maximum allowable distance for fastening drip edges. Such spacing may result in inadequate support, potentially leading to failure in the drip edge system during adverse weather conditions.
D) 42 inches.
This option is also incorrect because a maximum spacing of 42 inches far exceeds the established guidelines for fastening drip edges. Such a distance would likely compromise the effectiveness of the drip edge and could lead to issues such as water infiltration and roof damage.
Conclusion
The requirement for drip edges on steep slope roofs to be mechanically fastened at a maximum spacing of 12 inches is essential for ensuring proper performance and longevity of the roofing system. All other options fail to meet the necessary standards and could potentially lead to serious roofing issues, highlighting the importance of adhering to the established fastening guidelines.
2. How is the slope of a roof calculated?
Answer: A
Slope = Total Rise divided by Total Run.
The slope of a roof is calculated by dividing the total rise by the total run, which represents the vertical change in height over the horizontal distance covered. This formula is essential for determining the angle of the roof and ensuring proper drainage and structural integrity.
A) Slope = Total Rise divided by Total Run.
This option accurately describes the formula for calculating the slope of a roof. The total rise refers to the vertical distance from the lowest point of the roof to the highest point, while the total run is the horizontal distance. This ratio provides the correct measurement of slope, making it the right choice.
B) Slope = Total Height divided by Total Length.
This option is incorrect because it uses "total height" and "total length" instead of the correct terms "total rise" and "total run." While height and length may seem similar, they do not specifically relate to how slope is defined in roofing terms and can lead to miscalculations.
C) Slope = Total Run divided by Total Rise.
This option is incorrect as it reverses the relationship between rise and run. The slope is defined as the rise over the run, not the other way around. This misunderstanding would lead to a different and incorrect calculation of the roof slope.
D) Slope = Total Rise divided by Total Span.
This option is also incorrect because it mentions "total span," which usually refers to the distance across the entire width of the roof rather than the horizontal distance to measure slope. The correct calculation must focus on the run, not the span.
Conclusion
The correct answer is definitively A) Slope = Total Rise divided by Total Run, as it precisely describes the standard formula for calculating roof slope. Options B, C, and D all contain inaccuracies regarding the terminology and relationships necessary for accurate slope calculations, making them unsuitable for this context. Understanding the correct formula is crucial for ensuring effective roof design and functionality.
3. Mineral surface open valley linings for asphalt shingles shall be a
Answer: D
Mineral surface open valley linings for asphalt shingles shall be a double layer, 18 inches on the bottom and 36 inches on the top.
The specification for mineral surface open valley linings for asphalt shingles requires a double layer, consisting of 18 inches on the bottom and 36 inches on the top to ensure proper functionality and durability.
A) single layer 24 inches wide.
This option is incorrect because a single layer does not provide the necessary support and water shedding capabilities required for effective valley linings in asphalt shingle applications. The minimum specified layering is not met.
B) single layer 36 inches wide.
Although this option specifies a wider single layer, it still fails to meet the requirement for a double layer. A single layer cannot adequately manage the flow of water in the valley, which is critical for preventing leaks and ensuring longevity.
C) double layer, 12 inches on the bottom and 24 inches on the top.
While this option includes a double layer, the dimensions do not conform to the specified requirements. The bottom layer should be 18 inches, not 12 inches, which compromises the effectiveness of the valley lining.
D) double layer, 18 inches on the bottom and 36 inches on the top.
This option is correct as it meets the established standards for mineral surface open valley linings. The specified dimensions provide the necessary coverage and support to effectively manage water flow, thereby enhancing the roof’s integrity.
Conclusion
Option D is definitively correct as it adheres to the requirements for mineral surface open valley linings, ensuring optimal performance in asphalt shingle roofing. All other options fail to meet the necessary criteria for effective water management and structural support, making them unsuitable choices.
4. A coal-tar, built-up roof should typically have what MINIMUM slope to ensure adequate drainage?
Answer: A
A coal-tar, built-up roof should typically have a minimum slope of 1/8 inch per foot to ensure adequate drainage.
A roof designed with a slope of 1/8 inch per foot is generally sufficient to facilitate proper drainage, preventing water pooling and potential damage.
A) 1/8 inch per foot.
This option is correct as it represents the minimum slope recommended for coal-tar, built-up roofs. A slope of 1/8 inch per foot is considered adequate to ensure that water drains effectively, reducing the risk of leaks and structural issues.
B) 1/2 inch per foot.
While a slope of 1/2 inch per foot would provide good drainage, it exceeds the minimum requirement for coal-tar, built-up roofs. Therefore, it is not the correct answer to the question, as the minimum slope needed is less than this.
C) 1 inch per foot.
This option is incorrect because a slope of 1 inch per foot is significantly steeper than the minimum requirement. Such a steep slope may not be necessary for adequate drainage and could lead to complications in construction and maintenance.
D) 2 inches per foot.
A slope of 2 inches per foot is excessively steep for a coal-tar, built-up roof. This option is incorrect as it far exceeds the minimum slope needed for effective drainage, making it impractical for standard roofing applications.
Conclusion
The minimum slope of 1/8 inch per foot is essential for ensuring effective drainage in coal-tar, built-up roofs. Options B, C, and D, while providing adequate drainage, do not meet the specified minimum requirement, making them incorrect. Therefore, option A is the only appropriate choice, aligning with industry standards for roofing design.
5. The installation of clay roofing tile shall comply with
Answer: B
The installation of clay roofing tile shall comply with ASTM C 1167.
Clay roofing tile installation must adhere to the standards set forth in ASTM C 1167 to ensure quality, safety, and durability.
A) ASTM C 67.
ASTM C 67 pertains to the testing of the physical properties of clay masonry units, which does not specifically address the installation requirements for clay roofing tiles. Therefore, this option is incorrect as it does not relate directly to roofing tile installation.
B) ASTM C 1167.
ASTM C 1167 specifically outlines the requirements for the installation of clay roofing tiles. This standard ensures that the tiles are installed properly for optimal performance and longevity, making this the correct choice.
C) ASTM D 225.
ASTM D 225 covers the specifications for asphalt shingles, not clay roofing tiles. This makes Option C irrelevant to the installation of clay roofing tile, thus it is incorrect.
D) ASTM D 2626.
ASTM D 2626 addresses the specifications for fiberglass shingles, which do not relate to clay roofing tile. Consequently, this option is also incorrect regarding installation standards for clay roofing.
Conclusion
The correct answer, ASTM C 1167, directly pertains to the installation of clay roofing tiles, ensuring adherence to industry standards. Other options either relate to different materials or do not provide installation guidelines, confirming their incorrectness in this context.
Answer: B
The asphalt strip shingles in a woven valley should extend beyond the center of the valley a minimum of 12 inches.
For proper installation in a woven valley, asphalt strip shingles need to extend at least 12 inches beyond the center of the valley to ensure adequate water shedding and prevent leaks.
A) 6
Selecting 6 inches is insufficient for a woven valley installation. This measurement does not provide enough overlap to effectively channel water away from the valley, increasing the risk of water penetration and potential damage.
B) 12
This option is correct as it meets the minimum requirement for extending asphalt strip shingles in a woven valley. An extension of 12 inches ensures optimal water drainage and enhances the overall integrity of the roofing system.
C) 18
While 18 inches provides more coverage than necessary, it exceeds the minimum requirement. This may not be practical in terms of material use and installation efficiency, making it an incorrect choice for the specified minimum.
D) 24
Choosing 24 inches is excessive for a woven valley. Similar to option C, while it offers significant overlap, it goes beyond what is required, which could result in unnecessary material costs and labor.
Conclusion
The correct answer is 12 inches, as it aligns with industry standards for roofing installation in woven valleys, ensuring effective water management. Other options either fall short of the requirement or exceed it unnecessarily, demonstrating a lack of understanding of proper roofing practices.
Answer: B
The application rate for the surface emulsion is 3.0 gallons per square.
The application rate for surfacing bitumen on a roof with a 4 in 12 pitch is determined to be 3.0 gallons per square, which is essential for ensuring proper coverage and adhesion of the emulsion.
A) 1.5 gallons.
This option is incorrect as an application rate of 1.5 gallons per square would likely be insufficient for a roof with a 4 in 12 pitch. Such a low rate may not provide adequate coverage, potentially leading to issues with waterproofing and durability of the roofing surface.
B) 3.0 gallons.
This option is correct because an application rate of 3.0 gallons per square is appropriate for ensuring that the asphalt emulsion adequately bonds to the bitumen surface. This rate takes into consideration the pitch and surface characteristics, providing a balance between coverage and material efficiency.
C) 5.0 gallons.
An application rate of 5.0 gallons per square is excessive for a roof with a 4 in 12 pitch. Applying too much emulsion can lead to pooling and wastage, as well as an increased risk of the surface becoming overly saturated, which could compromise the integrity of the roofing system.
D) 7.0 gallons.
This option is also incorrect as an application rate of 7.0 gallons per square is far too high for this type of roofing application. Such a high rate would not only be wasteful but could also lead to serious performance issues, including poor adhesion and potential failure of the roofing system.
Conclusion
The application rate of 3.0 gallons per square is optimal for surfacing bitumen on a roof with a 4 in 12 pitch, ensuring adequate coverage without wastage. The other options either fall short of providing necessary coverage or exceed what is necessary, leading to potential issues with the roofing system's performance and longevity.
8. What should be done when using metal to repair splits in wood shingles?
Answer: D
The metal should be slid under the split and the bottom edge of the metal should be bent 90 degrees to hold it in place.
This method effectively secures the metal in place while providing support to the damaged wood shingles, ensuring a more durable repair.
A) All exposed nails should be sealed with roofing cement.
While sealing exposed nails with roofing cement is a good practice to prevent leaks, it does not address the specific issue of repairing splits in wood shingles. This option does not provide a direct solution to hold the metal in place or repair the split itself.
B) A new shake or shingle should be installed over the metal.
Installing a new shake or shingle over the metal may cover the repair but does not effectively secure the metal underneath. This option overlooks the crucial step of properly placing and securing the metal to support the split, which is necessary for a long-lasting repair.
C) New felt paper should be slipped between the metal and the damaged shake or shingle.
While adding felt paper may provide some level of protection, it does not address the requirement of securing the metal properly. This option fails to provide a reliable method for holding the metal in place, which is essential for effectively repairing the split.
D) The metal should be slid under the split and the bottom edge of the metal should be bent 90 degrees to hold it in place.
This option provides a practical and effective solution for repairing splits in wood shingles. By sliding the metal under the split and bending it, the repair is secured properly, ensuring that the damaged area is reinforced and less likely to fail again.
Conclusion
Option D is the most effective method for repairing splits in wood shingles, as it directly addresses the need to secure the metal and support the damaged area. The other options either do not provide a comprehensive solution or miss the critical step of anchoring the metal in place, making them less effective for this specific repair task.
9. On a hip roof, what shape should ridge caps cut from 3-tab shingles be?
Answer: A
Ridge caps cut from 3-tab shingles should be diamond shaped.
Ridge caps made from 3-tab shingles are designed to be cut into a diamond shape to provide optimal coverage and aesthetic appeal on a hip roof.
A) Diamond shape.
This option is correct as diamond-shaped ridge caps allow for effective water runoff and fit well with the sloped design of hip roofs, ensuring that the shingles overlap properly and provide a secure seal against the elements.
B) Square with tapered lap portions.
While a square shape may provide some coverage, it does not conform to the design requirements of a hip roof where a diamond shape is preferred for both functional and visual alignment with the roof’s angles.
C) Rounded across the top.
Rounded ridge caps would not effectively cover the edges of the hip roof, potentially leading to water infiltration and inadequate protection, making this option unsuitable for the intended purpose.
D) Triangular.
Triangular ridge caps do not match the required design for hip roofs, as they would not allow for the proper overlap and sealing necessary to prevent water damage and ensure aesthetic consistency.
Conclusion
The diamond shape is the optimal choice for ridge caps made from 3-tab shingles on a hip roof, as it ensures proper fit and functionality. Other shapes, such as square, rounded, or triangular, fail to meet the design and performance standards necessary for effective roof coverage.
Answer: C
Coal tar built-up roofs shall have a design slope of a minimum of 1/4 unit vertical within 12 units horizontal.
The minimum design slope for coal tar built-up roofs is 1/4 unit vertical for every 12 units horizontal, ensuring proper drainage and preventing water accumulation.
A) 1
Option A is incorrect because a slope of 1 unit vertical within 12 units horizontal exceeds the minimum requirement. While steeper slopes can enhance drainage, they are not necessary to meet the minimum standard.
B) 1/2
Option B is also incorrect as it specifies a slope of 1/2 unit vertical within 12 units horizontal. This slope is steeper than the required minimum and does not reflect the specified standard for coal tar built-up roofs.
C) 1/4
Option C is correct because it accurately states the required minimum slope of 1/4 unit vertical within 12 units horizontal. This slope is essential for effective drainage and compliance with roofing standards.
D) 1/8
Option D is incorrect as it suggests a slope of 1/8 unit vertical within 12 units horizontal, which is below the minimum requirement. A slope this shallow could lead to inadequate drainage and potential water damage.
Conclusion
The correct answer, 1/4 unit vertical within 12 units horizontal, is essential for ensuring effective drainage in coal tar built-up roofs. All other options fail to meet the minimum requirement, either being too steep or insufficiently shallow, which could compromise the roof's integrity and performance.