The NRCA Roofing Manual: Membrane Roof Systems - September RRO

Question 1 of 20

1

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

Select one of the following:

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.

Explanation

Question 2 of 20

1

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.

Select one of the following:

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

Explanation

Question 3 of 20

1

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.

Select one of the following:

4
8
24
48

Explanation

Question 4 of 20

1

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

Select one of the following:

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.

Explanation

Question 5 of 20

1

“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:

Select one of the following:

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.

Explanation

Question 6 of 20

1

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:

Select one of the following:

“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.”

Explanation

Question 7 of 20

1

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.

Select one of the following:

True
False

Explanation

Question 8 of 20

1

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.

Select one of the following:

True
False

Explanation

Question 9 of 20

1

Review the image and select the correct answer:

Select one of the following:

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

Explanation

Question 10 of 20

1

Review the drawing and select the best answer about Letter A:

Select one of the following:

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

Explanation

Question 11 of 20

1

Review the drawing and select the best answer about Letter B

Select one of the following:

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

Explanation

Question 12 of 20

1

Review the drawing and select the best answer about Letter C

Select one of the following:

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

Explanation

Question 13 of 20

1

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:

Select one of the following:

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 required for the building, and provide the necessary pullout resistance for fasteners used
with a new mechanically attached re-cover roof system.
If the new roof system is fully adhered to the existing roof system, the existing roof membrane and insulation, if any, should be secured to the roof deck according to appropriate wind uplift
resistance requirements. The surface of the existing roof system may require preparation and/or may need to be primed with a compatible primer to enhance adhesion before application of the new adhered roof system.
The existing roof system should be inspected and tested, if necessary, to determine whether excess moisture is present within the roof
assembly. 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 present problems should be secured or removed.
All of these are general recommendations that should be considered.

Explanation

Question 14 of 20

1

Review the image and choose the correct answer:

Select one of the following:

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"

Explanation

Question 15 of 20

1

Review the image and choose the correct answer:

Select one of the following:

A = 8", B = 8", C = 8"
A = 12", B = 8", C = 8"
A = 12", B = 12", C = 8"
A = 8", B = 8", C = 4"

Explanation

Question 16 of 20

1

Review the image and choose the correct answer about A

Select one of the following:

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

Explanation

Question 17 of 20

1

Review the image. Letter A should say:

Select one of the following:

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 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 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 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.

Explanation

Question 18 of 20

1

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

Select one of the following:

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:

Explanation

Question 19 of 20

1

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:

Select one of the following:

SBS Polymer-modified Bitumen Base Sheets
SBS Polymer-modified Bitumen Cap Sheets
Ethylene Propylene Diene Monomer Sheets
APP Polymer-modified Bitumen Sheets

Explanation

Question 20 of 20

1

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

Select one of the following:

True
False

	Created by Tommaso Costanzo over 10 years ago

The NRCA Roofing Manual: Membrane Roof Systems - September RRO

The NRCA Roofing Manual: Membrane Roof Systems - September RRO

The NRCA Roofing Manual: Membrane Roof Systems - September RRO

Question 1 of 20

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

Select one of the following:

Explanation

Question 2 of 20

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.

Select one of the following:

Explanation

Question 3 of 20

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.

Select one of the following:

Explanation

Question 4 of 20

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

Select one of the following:

Explanation

Question 5 of 20

“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:

Select one of the following:

Explanation

Question 6 of 20

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:

Select one of the following:

Explanation

Question 7 of 20

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.

Select one of the following:

Explanation

Question 8 of 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.

Select one of the following:

Explanation

Question 9 of 20

Review the image and select the correct answer:

Select one of the following:

Explanation

Question 10 of 20

Review the drawing and select the best answer about Letter A:

Select one of the following:

Explanation

Question 11 of 20

Review the drawing and select the best answer about Letter B

Select one of the following:

Explanation

Question 12 of 20

Review the drawing and select the best answer about Letter C

Select one of the following:

Explanation

Question 13 of 20

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:

Select one of the following:

Explanation

Question 14 of 20

Review the image and choose the correct answer:

Select one of the following:

Explanation

Question 15 of 20

Review the image and choose the correct answer:

Select one of the following:

Explanation

Question 16 of 20

Review the image and choose the correct answer about A

Select one of the following:

Explanation

Question 17 of 20

Review the image. Letter A should say:

Select one of the following:

Explanation

Question 18 of 20

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

Select one of the following:

Explanation

Question 19 of 20

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:

Select one of the following:

Explanation

Question 20 of 20

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

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.

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.

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

“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:

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.

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: