The Nrca Roofing Manual: Membrane Roof Systems

20 Questions | By Tremco_Roof_Edu | Last updated: Dec 10, 2014 | Total Attempts: 97

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The Nrca Roofing Manual: Membrane Roof Systems

Questions and Answers

1.

The following types of roof decks are addressed in this manual:
- A.
  
  Cementitious wood-fiber panels
- B.
  
  Lightweight insulating concrete
- C.
  
  Steel
- D.
  
  Structural concrete (cast-in-place, post-tensioned and precast/prestressed)
- E.
  
  Wood panels (plywood, oriented strand board/OSB)
- F.
  
  Wood planks and wood boards
- G.
  
  All of the listed are deck types addressed in the manual.
2.

Review the image and select the correct answer:
- A.
  
  A = Side Lap, B = Exposure Lap, C = End Lap
- B.
  
  A = Side Lap, B = End Lap, C = Bottom Lap
- C.
  
  A = Side Lap, B = Head Lap, C = End Lap
3.

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.
- A.
  
  1/8:12 and 1/4:12
- B.
  
  1⁄4:12 and 1⁄8:12
- C.
  
  1⁄4:12 and 1⁄2:12
- D.
  
  1⁄4:12 and 1⁄2:24
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.
- A.
  
  48
- B.
  
  24
- C.
  
  8
- D.
  
  16
5.

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:
- A.
  
  Cellular glass and Expanded polystyrene (EPS)
- B.
  
  Extruded polystyrene (XPS) and Faced gypsum
- C.
  
  Fiber-reinforced gypsum and mineral fiber
- D.
  
  Perlite and Polyisocyanurate (ISO)
- E.
  
  High-density polyisocyanruate and Wood fiberboard
- F.
  
  All of the listed are types of rigid roof insulation.
6.

“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:
- A.
  
  Increased roof system thermal performance.
- B.
  
  Reduced thermal loss.
- C.
  
  Reduced thermal bridging.
- D.
  
  Reduced potential for membrane buckling, ridging and splitting.
- E.
  
  All of the choices are correct - it is important to understand each one.
7.

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:
- A.
  
  “Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation.”
- B.
  
  “Standard Test Method for Predicting Long-Term Thermal Reflectance of Closed-Cell Foam Insulation.”
- C.
  
  “Standard Test Method for Predicting Long-Term Thermal Reflectivity of Closed-Cell Foam Insulation.”
- D.
  
  “Standard Test Method for Predicting Long-Term Technical Resistance of Closed-Cell Foam Insulation.”
8.

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.
- A.
  
  True
- B.
  
  False
9.

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.
- A.
  
  True
- B.
  
  False
10.

Review the imgage and select the best answer about Letter A:
- A.
  
  Letter A is a 2 ply configuration with a 12" or 12 9/6" exposure
- B.
  
  Letter A is a 3 ply configuration with a 12" or 14 9/6" exposure
- C.
  
  Letter A is a 3 ply configuration with a 17" or 18 9/16" exposure
- D.
  
  Letter A is a 2 ply configuration with a 17" or 18 9/16" exposure
11.

Review the image and select the best answer about Letter B
- A.
  
  Letter B is a 2 ply configuration with a 17" or 18 9/16" exposure
- B.
  
  Letter B is a 3 ply configuration with a 17" or 18 9/16" exposure
- C.
  
  Letter B is a 3 ply configuration with a 11 1/3" or 12 7/16" exposure
- D.
  
  Letter B is a 4 ply configuration with a 11 1/3" or 12 7/16" exposure
12.

Review the image and select the best answer about Letter C:
- A.
  
  Letter C is a 4 ply configuration with a 8 1/2" or 9 5/16" exposure
- B.
  
  Letter C is a 3 ply configuration with a 8 1/2" or 9 5/16" exposure
- C.
  
  Letter C is a 3 ply configuration with a 9" or 12" exposure
- D.
  
  Letter C is a 4 ply configuration with a 9" or 12" exposure
13.

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:
- A.
  
  The existing roof system and new re-cover roof system must be compatible or appropriately separated.
- B.
  
  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
- C.
  
  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.
- D.
  
  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.
- E.
  
  All of these are general recommendations that should be considered.
14.

Review the image and choose the correct answer:
- A.
  
  A = 6", B = 12" and C = 12
- B.
  
  A = 6", B = 6" and C = 12"
- C.
  
  A = 12", B = 12" and C = 24"
- D.
  
  A = 12", B = 24" and C = 24"
15.

Review the image and choose the correct answer:
- A.
  
  A = 8", B = 8", C = 8"
- B.
  
  A = 12", B = 8", C = 8"
- C.
  
  A = 12", B = 12", C = 8"
- D.
  
  A = 8", B = 8", C = 4
16.

Review the image and choose the correct answer about A:
- A.
  
  2 1/2 LB. lead or 16 oz. soft copper
- B.
  
  20" square minimum, 2 1/2 LB. lead or 16 oz. soft copper
- C.
  
  30" square minimum, 2 1/2 LB. lead or 12 oz. soft copper
- D.
  
  30" square minimum, 2 1/2 LB. lead or 16 oz. soft copper
17.

Review the image. Letter A should say:
- A.
  
  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.
- B.
  
  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.
- C.
  
  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.
- D.
  
  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.
18.

Base Sheets and Ply Sheets include all of the following EXCEPT:
- A.
  
  Asphalt-coated Fiberglass-mat Base Sheet:
- B.
  
  Asphalt-coated Fiberglass Venting Base Sheets:
- C.
  
  Asphalt Fiberglass Ply Sheets:
- D.
  
  Coal Tar Impregnated Fiberglass Ply Sheet:
- E.
  
  Asphalt-coated Fiberglass Cap Sheet Surfaced With Mineral Granules:
19.

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:
- A.
  
  SBS Polymer-modified Bitumen Base Sheets
- B.
  
  SBS Polymer-modified Bitumen Cap Sheets
- C.
  
  Ethylene Propylene Diene Monomer Sheets
- D.
  
  APP Polymer-modified Bitumen Sheets
20.

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

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