Question 1

List two important advantages of single- ply roof (SPR)membrane over built- up roof (BUR)and modified- bitumen roof (MBR)membranes.

Accepted Answer

1. SPR membranes are far more flexible t

Question 2

The weight of aggregate surfacing on a built- up roof is generally

Accepted Answer

A) 15 lb per roof square. 
B) 40 lb per roof square. 
C) 25 lb per roof square. 
D) 400 lb per roof square. 
E) 5 lb per roof square. 
A) 15 lb per roof square. 
B) 40 lb per roof square. 
C) 25 lb per roof square. 
D) 400 lb per roof square. 
E) 5 lb per roof square.

Question 3

Using sketches, explain the anatomies of the following roofs. Show how the insulation and roof membrane are attached.
a. Steel deck, rigid board insulation, and built- up roof membrane
b. Reinforced- concrete deck, rigid board insulation, and SBS- modified bitumen membrane
c. Steel deck, foamed- concrete insulation, and built- up roof membrane
d. Concrete deck, rigid board insulation, and loose- laid, ballasted single- ply membrane

Accepted Answer

a. For a steel deck, rigid board insulat

Question 4

The lap seams in a TPO roof membrane are typically sealed by

Accepted Answer

A) heat welding. 
B) liquid adhesives. 
C) single- sided tape. 
D) double- sided tape. 
E) any one of the above. 
A) heat welding. 
B) liquid adhesives. 
C) single- sided tape. 
D) double- sided tape. 
E) any one of the above.

Question 5

Explain why low- slope roof components (membrane, cover board, insulation, adhesives, and fasteners)must be obtained from the same manufacturer.

Accepted Answer

A low- slope roof must meet certain perf

Question 6

Built- up roof felts are available in Type IV and Type VI. Explain the difference between them.

Accepted Answer

The difference lies in their t

Question 7

Explain the difference between thermosetting and thermoplastic roof membranes, and give at least one example of each. How does the difference between the two types influence the sealing of lap seams between adjacent membranes?

Accepted Answer

Thermosetting and thermoplastic roof mem

Question 8

How does the building industry distinguish between a low- slope roof and a steep roof?

Accepted Answer

Low- slope roof is defined as

Question 9

The exposure (EX)of felts in a four- ply built- up roof is

Accepted Answer

A) 2 in. 
B) 4 in. 
C) 8 in. 
D) 6 in. 
E) none of the above. 
A) 2 in. 
B) 4 in. 
C) 8 in. 
D) 6 in. 
E) none of the above.

Question 10

What is the typical width and length of built- up roof felt rolls?

Accepted Answer

36- in.- wide (3- ft

Question 11

Is a roof cover board required above insulating concrete or foamed concrete insulation before installing the roof membrane?

Accepted Answer

The answer of Is a roof cover board required above...

Question 12

Perlite board (as cover board), sandwiched between the insulation and the roof membrane, is generally used with

Accepted Answer

A) a fully adhered single- ply membrane. 
B) a loose- laid, ballasted single- ply membrane. 
C) a mechanically fastened single- ply membrane. 
D) an asphalt- mopped membrane. 
A) a fully adhered single- ply membrane. 
B) a loose- laid, ballasted single- ply membrane. 
C) a mechanically fastened single- ply membrane. 
D) an asphalt- mopped membrane.

Question 13

EPDM is a thermosetting plastic.

Accepted Answer

A) True 
 B)False

Question 14

A mechanically fastened single- ply roof membrane is generally used with

Accepted Answer

A) steel roof decks. 
B) precast- concrete decks. 
C) reinforced- concrete decks. 
D) none of the above. 
A) steel roof decks. 
B) precast- concrete decks. 
C) reinforced- concrete decks. 
D) none of the above.

Question 15

A built- up roof (BUR)consists of multiple plies where a ply is defined as one felt field mopped with asphalt. The thickness of one BUR ply is approximately 30 mil. A modified bitumen roof (MBR), on the other hand, consists of modified bitumen sheets. What is the composition of a modified bitumen sheet and its typical thickness?

Accepted Answer

A modified bitumen sheet consists of two

Question 16

What is a roof square and how is it related to the dimensions of built- up roof (BUR)felt roll?

Accepted Answer

A roof square = 100 sq ft of roof area.

Question 17

Lap splices in some single- ply roof (SPR)membranes are heat fused and in the other, they are adhered with double- sided tape. Name the membranes in which heat- fusing of splices is done and the membrane in which double- sided tape is used.

Accepted Answer

Seams in thermoplastic (TPO an

Question 18

A slotted steel roof deck is mandated for use with

Accepted Answer

A) lightweight insulating concrete. 
B) foamed concrete. 
C) all rigid board insulations. 
D) none of the above. 
A) lightweight insulating concrete. 
B) foamed concrete. 
C) all rigid board insulations. 
D) none of the above.

Question 19

Which cover board is commonly used with hot- mopped built- up and modified- bitumen roofs and what is its thickness?

Accepted Answer

Perlite board or asp

Question 20

Which of the following modified bitumen membranes is more elastomeric?

Accepted Answer

A) SBS- modified bitumen 
B) APP- modified bitumen 
A) SBS- modified bitumen 
B) APP- modified bitumen

Exam 33: Roofing-I Low-Slope Roofs

List two important advantages of single- ply roof (SPR)membrane over built- up roof (BUR)and modified- bitumen roof (MBR)membranes.

The weight of aggregate surfacing on a built- up roof is generally

The lap seams in a TPO roof membrane are typically sealed by

Explain why low- slope roof components (membrane, cover board, insulation, adhesives, and fasteners)must be obtained from the same manufacturer.

Built- up roof felts are available in Type IV and Type VI. Explain the difference between them.

Explain the difference between thermosetting and thermoplastic roof membranes, and give at least one example of each. How does the difference between the two types influence the sealing of lap seams between adjacent membranes?

How does the building industry distinguish between a low- slope roof and a steep roof?

The exposure (EX)of felts in a four- ply built- up roof is

What is the typical width and length of built- up roof felt rolls?

Is a roof cover board required above insulating concrete or foamed concrete insulation before installing the roof membrane?

Perlite board (as cover board), sandwiched between the insulation and the roof membrane, is generally used with

EPDM is a thermosetting plastic.

A mechanically fastened single- ply roof membrane is generally used with

What is a roof square and how is it related to the dimensions of built- up roof (BUR)felt roll?

Lap splices in some single- ply roof (SPR)membranes are heat fused and in the other, they are adhered with double- sided tape. Name the membranes in which heat- fusing of splices is done and the membrane in which double- sided tape is used.

A slotted steel roof deck is mandated for use with

Which cover board is commonly used with hot- mopped built- up and modified- bitumen roofs and what is its thickness?

Which of the following modified bitumen membranes is more elastomeric?

An Overview of the Building Delivery Process How Buildings Come Into Being

Design and Constructions Regulations

Loads on Buildings

Load Resistance the Structural Properties of Materials

Properties of the Envelope-I Thermal Properties

Properties of the Envelope-II Air and Water Vapor Control

Fire and Smoke-Related Properties

Acoustical Properties of Materials

Principles of Joints and Sealants Expansion and Contraction Control

Principles of Sustainable Construction

Soils and Excavations

Below-Grade Construction Foundation Systems and Basements

Materials for Wood Construction-I Lumber

Materials for Wood Construction-Ii Engineered Wood Products, Fasteners, and Connectors

Wood Light-Frame Construction-I

Wood Light-Frame Construction-II

Structural Insulated Panel Construction

Material Steel and Steel Components

Structural Steel Construction

Cold-Formed Steel Construction

Lime, Portland Cement, and Concrete

Concrete Construction-I Formwork, Reinforcement, and Slabs-On-Ground

Concrete Construction-II Site-Cast and Precast Concrete Framing Systems

Masonry Materials-I Mortar and Brick

Masonry Materials-II Concrete Masonry Units, Natural Stone, and Glass Masonry Units

Masonry and Concrete Bearing Wall Construction

Exterior Wall Cladding-I Principles of Rainwater Infiltration Control

Exterior Wall Cladding-II Masonry, Precast Concrete, and Gfrc

Exterior Wall Cladding-III Stucco, Adhered Veneer, Eifs, Natural Stone, and Insulated Metal Panels

Glass, Glazing, and Light-Transmitting Plastics

Windows and Doors

Exterior Wall Cladding-Iv Wall System in Glass

Roofing-I Steep Roofs

Stairs

Floor Coverings

Ceilings

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