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B - General Commercial > Membrane & Steep-Slope Roof Systems > Flashcards

Membrane & Steep-Slope Roof Systems Flashcards

1
Q

What is the slope of a low-roof system?

A

3:12

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2
Q

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 hours

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3
Q

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

A

1/8”

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4
Q

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

A

22-gauge
G-90

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5
Q

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

A

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

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6
Q

Steel deck side lap fastener spacing should not exceed?

A

3 feet

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7
Q

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

A

Bituminous vapor retarders

Plastic Sheet or Film Vapor Retarders

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8
Q

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

A

1-1/2 inches

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9
Q

What is the product standard for faced polyisocyanurate?

A

ASTM C1289

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10
Q

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

A

ASTM D312

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11
Q

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

A

135F Minimum
151 F Maximum

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12
Q

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

A

210F Minimum
225F Maximum

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13
Q

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

A

25F

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14
Q

What are the three categories for roll roofing materials?

A
  • base sheets
  • ply sheets
    -mineral-surfaces cap sheet
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15
Q

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

A

8” minimum flashing height

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16
Q

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

A

ballasts

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17
Q

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

A

495F

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18
Q

What are the two general categories of metal roofing systems?

A

Cold-rolled and panel

19
Q

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

A

Fishmouths

20
Q

Type II ASTM D312 is ______ asphalt

A

flat

21
Q

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

A

1-3/4”

22
Q

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

A

More than 1-1/2” thick

23
Q

Specifically, Type IV asphalt is suggested for slopes ________.

A

greater than 1:12

24
Q

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

A

3/4 of an inch

25
Q

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

A

5 inches

26
Q

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

A

Reglet

27
Q

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

A

8-foot or 10-foot

28
Q

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

A

24 inches wide

29
Q

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

A

4 inches

30
Q

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

A

12 inches

31
Q

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

A

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

32
Q

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.

A

minimum of 24 inches inside the exterior

33
Q

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

A

reglet, raggle

34
Q

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 _________.

A

2-inch minimum

35
Q

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

A

8 inches

36
Q

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 ________.

A

2 inches

37
Q

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.

A

2 inches short

38
Q

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

A

12” x 36”

39
Q

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 _________.

A

be applied over the sheet

40
Q

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

A

36-inch-wide

41
Q

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

A

5d box, 1-3/4”

42
Q

Ice dam protection membranes consist of ________.

A

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

43
Q

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

A

one-fourth unit vertical in 12 units horizontal

44
Q

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

A

17”

B - General Commercial (9 decks)

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