The Nrca Roofing Manual: Membrane Roof Systems

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| By Tremco_Roof_Edu

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1. The following types of roof decks are addressed in this manual:

Cementitious wood-fiber panels

Lightweight insulating concrete

Steel

Structural concrete (cast-in-place, post-tensioned and precast/prestressed)

Wood panels (plywood, oriented strand board/OSB)

Wood planks and wood boards

All of the listed are deck types addressed in the manual.

Chapter 1—Roof Decks - Page 13

Explanation

Chapter 1—Roof Decks - Page 13

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About This Quiz

The Nrca Roofing Manual: Membrane Roof Systems - Quiz

Explore key aspects of membrane roof systems as outlined in the NRCA Roofing Manual. This quiz covers roof deck types, insulation practices, and essential building codes, enhancing your... see moreunderstanding and skills in roofing technology. see less

2. The following general recommendation for recovering over an existing roof system with a new built-up, polymer-modified bitumen, single-ply or liquid-applied
membrane roof system should be considered:

The existing roof system and new re-cover roof system must be compatible or appropriately separated.

The roof deck should be secured to the structure of the building, support the design live load and dead load... The roof deck should be secured to the structure of the building, support the design live load and dead load required for the building, and provide the necessary pullout resistance for fasteners used

The existing roof system should be inspected and tested, if necessary, to determine whether excess moisture is present within the... The existing roof system should be inspected and tested, if necessary, to determine whether excess moisture is present within the roofassembly. Wet insulation must be removed and replaced with compatible materials.

The existing roof system should be inspected for shrinkage, ridging, splitting and cracking and then repaired appropriately. Portions that may... The existing roof system should be inspected for shrinkage, ridging, splitting and cracking and then repaired appropriately. Portions that may present problems should be secured or removed.

All of these are general recommendations that should be considered.

Chapter 9—Roof Re-covering - page 210

Explanation

Chapter 9—Roof Re-covering - page 210

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3. "Thermal Evaluation of the Effects of Gaps Between Adjacent Roof Insulation Panels" from the Proceedings of the DOE-ORNL Workshop on Mathematical Modeling of Roofs have shown that a minimum of two layers of rigid insulation can provide the following benefits to low-slope roof systems:

Increased roof system thermal performance.

Reduced thermal loss.

Reduced thermal bridging.

Reduced potential for membrane buckling, ridging and splitting.

All of the choices are correct - it is important to understand each one.

Chapter 3—Rigid Board Insulation - page 44

Explanation

Chapter 3—Rigid Board Insulation - page 44

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4. Roof decks should be sloped to provide positive drainage for a finished roof system. The criterion for judging proper slope for drainage is that there be no ponding water on the roof __________ hours after a rain during conditions conducive to drying.

Chapter 1—Roof Decks - Page 15

Explanation

Chapter 1—Roof Decks - Page 15

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5. Nailable Roof Decks: Mechanical fastening is a common method for attaching the first layer of high-density polyisocyanurate insulation to certain types of nailable roof decks. If a base sheet first is mechanically fastened to the deck, hot bitumen or adhesive may be used to adhere the insulation.

True

False

Chapter 3—Rigid Board Insulation - page 65

Explanation

Chapter 3—Rigid Board Insulation - page 65

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6. Membrane flashings typically consist of a base or backer layer or layers and a cap sheet. The following are types of modified bitumen membranes - EXCEPT:

SBS Polymer-modified Bitumen Base Sheets

SBS Polymer-modified Bitumen Cap Sheets

Ethylene Propylene Diene Monomer Sheets

APP Polymer-modified Bitumen Sheets

Chapter 4—Roof Membranes - page 85

Explanation

Chapter 4—Roof Membranes - page 85

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7. The following are the generic types of rigid roof insulation that are referenced in this manual and are currently among those most commonly used or found in low-slope membrane roof systems in North America:

Cellular glass and Expanded polystyrene (EPS)

Extruded polystyrene (XPS) and Faced gypsum

Fiber-reinforced gypsum and mineral fiber

Perlite and Polyisocyanurate (ISO)

High-density polyisocyanruate and Wood fiberboard

All of the listed are types of rigid roof insulation.

Chapter 3—Rigid Board Insulation - page

Explanation

Chapter 3—Rigid Board Insulation - page

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8. Most manufacturers of polyisocyanurate insulation report an R-value of 6.0 per inch of thickness based on the (LTTR) method of determination. LTTR method is defined by ASTM C1303 as the:

“Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation.”

“Standard Test Method for Predicting Long-Term Thermal Reflectance of Closed-Cell Foam Insulation.”

“Standard Test Method for Predicting Long-Term Thermal Reflectivity of Closed-Cell Foam Insulation.”

“Standard Test Method for Predicting Long-Term Technical Resistance of Closed-Cell Foam Insulation.”

Chapter 3—Rigid Board Insulation - page 62

Explanation

Chapter 3—Rigid Board Insulation - page 62

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9. There are two broad types of single-ply membranes based on their chemistry: thermoset single-ply membranes and thermoplastic single-ply membranes.

True

False

Chapter 4—Roof Membranes - page 97

Explanation

Chapter 4—Roof Membranes - page 97

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10. Review the image and choose the correct answer:

A = 6", B = 12" and C = 12

A = 6", B = 6" and C = 12"

A = 12", B = 12" and C = 24"

A = 12", B = 24" and C = 24"

Chapter 10—Construction Details - page 243

Explanation

Chapter 10—Construction Details - page 243

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11. Review the image and select the best answer about Letter C:

Letter C is a 4 ply configuration with a 8 1/2" or 9 5/16" exposure

Letter C is a 3 ply configuration with a 8 1/2" or 9 5/16" exposure

Letter C is a 3 ply configuration with a 9" or 12" exposure

Letter C is a 4 ply configuration with a 9" or 12" exposure

Chapter 4 - Roof Membranes Page 84

Explanation

Chapter 4 - Roof Membranes Page 84

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12. Review the image and select the best answer about Letter B

Letter B is a 2 ply configuration with a 17" or 18 9/16" exposure

Letter B is a 3 ply configuration with a 17" or 18 9/16" exposure

Letter B is a 3 ply configuration with a 11 1/3" or 12 7/16" exposure

Letter B is a 4 ply configuration with a 11 1/3" or 12 7/16" exposure

Chapter 4 - Roof Membranes Page 84

Explanation

Chapter 4 - Roof Membranes Page 84

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13. Base Sheets and Ply Sheets include all of the following EXCEPT:

Asphalt-coated Fiberglass-mat Base Sheet:

Asphalt-coated Fiberglass Venting Base Sheets:

Asphalt Fiberglass Ply Sheets:

Coal Tar Impregnated Fiberglass Ply Sheet:

Asphalt-coated Fiberglass Cap Sheet Surfaced With Mineral Granules:

Chapter 4—Roof Membranes - Page 83

Explanation

Chapter 4—Roof Membranes - Page 83

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14. Review the image and select the correct answer:

A = Side Lap, B = Exposure Lap, C = End Lap

A = Side Lap, B = End Lap, C = Bottom Lap

A = Side Lap, B = Head Lap, C = End Lap

The correct answer is A = Side Lap, B = Head Lap, C = End Lap. This is because in the image, A is shown as overlapping the side of another material, indicating a side lap. B is shown overlapping the top of another material, indicating a head lap. And C is shown overlapping the end of another material, indicating an end lap.

Explanation

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15. The International Building Code, 2009 Edition indicates a design minimum slope of _______________ is required for membrane roof systems, except for coal tar built-up roof system where a design minimum of _______________ is permitted.

1/8:12 and 1/4:12

1⁄4:12 and 1⁄8:12

1⁄4:12 and 1⁄2:12

1⁄4:12 and 1⁄2:24

Chapter 1—Roof Decks - Page 15

Explanation

Chapter 1—Roof Decks - Page 15

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16. Review the image and choose the correct answer about A:

2 1/2 LB. lead or 16 oz. soft copper

20" square minimum, 2 1/2 LB. lead or 16 oz. soft copper

30" square minimum, 2 1/2 LB. lead or 12 oz. soft copper

30" square minimum, 2 1/2 LB. lead or 16 oz. soft copper

Chapter 10 - Construction Details - page 300

Explanation

Chapter 10 - Construction Details - page 300

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17. Review the image. Letter A should say:

Sheet metal gutter - The front of the gutter should be a min. 1/2" lower than the back to allow... Sheet metal gutter - The front of the gutter should be a min. 1/2" lower than the back to allow for overflow. Refer to the architectural metal flashing section of the NRCA roofing manual: Architectural Metal Flashing, Condensation Control and Re-Roofing - 2010 for other shapes.

Sheet metal gutter - The front of the gutter should be a min. 1" lower than the back to allow... Sheet metal gutter - The front of the gutter should be a min. 1" lower than the back to allow for overflow. Refer to the architectural metal flashing section of the NRCA roofing manual: Architectural Metal Flashing, Condensation Control and Re-Roofing - 2010 for other shapes.

Sheet metal gutter - The front of the gutter should be a min. 2" lower than the back to allow... Sheet metal gutter - The front of the gutter should be a min. 2" lower than the back to allow for overflow. Refer to the architectural metal flashing section of the NRCA roofing manual: Architectural Metal Flashing, Condensation Control and Re-Roofing - 2010 for other shapes.

Sheet metal gutter - The front of the gutter should be a min. 3" lower than the back to allow... Sheet metal gutter - The front of the gutter should be a min. 3" lower than the back to allow for overflow. Refer to the architectural metal flashing section of the NRCA roofing manual: Architectural Metal Flashing, Condensation Control and Re-Roofing - 2010 for other shapes.

Chapter 10 - Construction Details - page 354

Explanation

Chapter 10 - Construction Details - page 354

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18. Review the imgage and select the best answer about Letter A:

Letter A is a 2 ply configuration with a 12" or 12 9/6" exposure

Letter A is a 3 ply configuration with a 12" or 14 9/6" exposure

Letter A is a 3 ply configuration with a 17" or 18 9/16" exposure

Letter A is a 2 ply configuration with a 17" or 18 9/16" exposure

Chapter 4 - Roof Membranes Page 84

Explanation

Chapter 4 - Roof Membranes Page 84

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19. Review the image and choose the correct answer:

A = 8", B = 8", C = 8"

A = 12", B = 8", C = 8"

A = 12", B = 12", C = 8"

A = 8", B = 8", C = 4

Chapter 10 - Construction Details - page 263

Explanation

Chapter 10 - Construction Details - page 263

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20. Non-nailable Roof Decks: Over dry, nonnailable roof decks, NRCA recommends applying high-density polyisocyanurate insulation in manufacturer-approved sealant over the properly prepared deck.

True

False

Chapter 3—Rigid Board Insulation - page 65 - approved - ADHESIVE -

Explanation

Chapter 3—Rigid Board Insulation - page 65 - approved - ADHESIVE -

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