Membrane & Steep-Slope Roof Systems

Question 1

What is the slope of a low-roof system?

Answer 1

3:12

Question 2

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.

Answer 2

48 hours

Question 3

Vertical alignment of cementitious wood fiber panels in excess of ____ inch in elevation difference is considered unacceptable in roofing.

Answer 3

1/8”

Question 4

NRCA recommends steel roof decks be __-gauge or heavier and have a minimum G-___ galvanized coating.

Answer 4

22-gauge
G-90

Question 5

When a design requires steel decks to be welded, what is the recommend puddle weld size and what is the maximum spacing?

Answer 5

Puddle welds of 1/2 of an inch or larger into steel washers
Spaced a maximum of 12 inches on center along every support

Question 6

Steel deck side lap fastener spacing should not exceed?

Answer 6

3 feet

Question 7

What are the two broad categories of vapor retarders in a membrane roof system?

Answer 7

Bituminous vapor retarders

Plastic Sheet or Film Vapor Retarders

Question 8

What is the minimum thickness for tapered cellular-glass insulation (roofing)?

Answer 8

1-1/2 inches

Question 9

What is the product standard for faced polyisocyanurate?

Answer 9

ASTM C1289

Question 10

The U.S. product standard for asphalt used in roof system applications is ASTM____

Answer 10

ASTM D312

Question 11

What is the softening point for hot-applied asphalt for built-up roof membranes - Type I?

Answer 11

135F Minimum
151 F Maximum

Question 12

What is the softening point for hot-applied asphalt for built-up roof membranes - Type IV?

Answer 12

210F Minimum
225F Maximum

Question 13

NRCA recommends asphalt be applied in the field within a +/- ____ temperature range from an asphalt’s indicated EVT.

Answer 13

25F

Question 14

What are the three categories for roll roofing materials?

Answer 14

• base sheets
• ply sheets
  -mineral-surfaces cap sheet

Question 15

What is the minimum base flashing around an equipment roof curb?

Answer 15

8” minimum flashing height

Question 16

When installing a loose-laid EPDM single-ply system, it will require the use of ______ to provide for the resistance against uplift forces.

Answer 16

ballasts

Question 17

The maximum temperature mop application for Type IV asphalt is _______ F.

Answer 17

495F

Question 18

What are the two general categories of metal roofing systems?

Answer 18

Cold-rolled and panel

Question 19

Specifically, on built-up roofs, irregularities, such as _____, should be cut and patched before applying the NEXT sequential ply.

Answer 19

Fishmouths

Question 20

Type II ASTM D312 is ______ asphalt

Answer 20

flat

Question 21

A Type F steel deck has a maximum rib opening of _____ inches

Answer 21

1-3/4”

Question 22

For wood fiberboard insulation, the recommended specification for multilayer insulation is when the total required thickness of the insulation is ______ .

Answer 22

More than 1-1/2” thick

Question 23

Specifically, Type IV asphalt is suggested for slopes ________.

Answer 23

greater than 1:12

Question 24

For wood plank or wood board roof decks, nails should penetrate at least _____ of an inch.

Answer 24

3/4 of an inch

Question 25

Typical exposure for standard size (36-inch-wide) strip shingles is _______.

Answer 25

5 inches

Question 26

For the attachment of counterflashing, the sheet metal receiver is referred to as a _____.

Answer 26

Reglet

Question 27

An open valley is typically constructed by installing _____ lengths of corrosion-resistant metal from the low point to the high point in the valley.

Answer 27

8-foot or 10-foot

Question 28

The NRCA recommends crickets at the upslope side of a chimney when the chimney is more than ________.

Answer 28

24 inches wide

Question 29

Typically, for single-layer underlayment applications, an end lap of __________ is recommended.

Answer 29

4 inches

Question 30

When installing metal drip edges, the NRCA suggests fastening the drip edge at about ______ on center.

Answer 30

12 inches

Question 31

A tapered open valley is 16 feet long. The distance between asphalt shingles should be _______.

Answer 31

4 inches greater at the bottom of the valley than at the top

Question 32

Water and ice-dam protection membranes should be applied starting at a roof's system's eaves and extend upslope to a point corresponding to a ______ wall line of a building.

Answer 32

minimum of 24 inches inside the exterior

Question 33

Specifically, to minimize water leaks, or to deflect water, friction fit sheet-metal_______ is inserted into a mortar cut _______ joint.

Answer 33

reglet, raggle

Question 34

Typically, the flashing head lap, when using metal step flashing that is 7 inches long by 8 inches wide for 12-inch by 36-inch shingles with 5-inch exposure, is _________.

Answer 34

2-inch minimum

Question 35

According to the NRCA, asphalt fasteners should be kept back from the center of a valley a minimum of _________.

Answer 35

8 inches

Question 36

Where wall cladding counterflashes step flashing, the NRCA recommends the cladding material and water-resistive barrier extend past and cover the top edge of the flashing metal a minimum of ________.

Answer 36

2 inches

Question 37

For a closed-cut valley, shingles on one side of the valley are installed across the valley and shingles from the other side are cut about _____ of the centerline of the valley.

Answer 37

2 inches short

Question 38

The common dimension standard for a three-tab shingle is __________.

Answer 38

12" x 36"

Question 39

For metal drip edges located at eaves, if a self-adhering polymer-modified bitumen is applied directly to the deck at eaves, drip edge metal should _________.

Answer 39

be applied over the sheet

Question 40

For a metal open valley, a minimum _________ layer of polymer-modified bitumen underlayment is centered in the valley under the field underlayment.

Answer 40

36-inch-wide

Question 41

When installing a 24-inch taper-split wood shake to a wood board substrate, the recommended fastener is a ________.

Answer 41

5d box, 1-3/4"

Question 42

Ice dam protection membranes consist of ________.

Answer 42

single-layer applications of self-adhering polymer-modified bitumen sheets

Question 43

Modified bitumen membrane roods shall have a slope design of not less than _______.

Answer 43

one-fourth unit vertical in 12 units horizontal

Question 44

How many inches are required for the exposure of roll roofing sheets?

Answer 44

17"