Membrane & Steep-Slope Roof Systems Flashcards
What is the slope of a low-roof system?
3:12
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.
48 hours
Vertical alignment of cementitious wood fiber panels in excess of ____ inch in elevation difference is considered unacceptable in roofing.
1/8”
NRCA recommends steel roof decks be __-gauge or heavier and have a minimum G-___ galvanized coating.
22-gauge
G-90
When a design requires steel decks to be welded, what is the recommend puddle weld size and what is the maximum spacing?
Puddle welds of 1/2 of an inch or larger into steel washers
Spaced a maximum of 12 inches on center along every support
Steel deck side lap fastener spacing should not exceed?
3 feet
What are the two broad categories of vapor retarders in a membrane roof system?
Bituminous vapor retarders
Plastic Sheet or Film Vapor Retarders
What is the minimum thickness for tapered cellular-glass insulation (roofing)?
1-1/2 inches
What is the product standard for faced polyisocyanurate?
ASTM C1289
The U.S. product standard for asphalt used in roof system applications is ASTM____
ASTM D312
What is the softening point for hot-applied asphalt for built-up roof membranes - Type I?
135F Minimum
151 F Maximum
What is the softening point for hot-applied asphalt for built-up roof membranes - Type IV?
210F Minimum
225F Maximum
NRCA recommends asphalt be applied in the field within a +/- ____ temperature range from an asphalt’s indicated EVT.
25F
What are the three categories for roll roofing materials?
- base sheets
- ply sheets
-mineral-surfaces cap sheet
What is the minimum base flashing around an equipment roof curb?
8” minimum flashing height
When installing a loose-laid EPDM single-ply system, it will require the use of ______ to provide for the resistance against uplift forces.
ballasts
The maximum temperature mop application for Type IV asphalt is _______ F.
495F
What are the two general categories of metal roofing systems?
Cold-rolled and panel
Specifically, on built-up roofs, irregularities, such as _____, should be cut and patched before applying the NEXT sequential ply.
Fishmouths
Type II ASTM D312 is ______ asphalt
flat
A Type F steel deck has a maximum rib opening of _____ inches
1-3/4”
For wood fiberboard insulation, the recommended specification for multilayer insulation is when the total required thickness of the insulation is ______ .
More than 1-1/2” thick
Specifically, Type IV asphalt is suggested for slopes ________.
greater than 1:12
For wood plank or wood board roof decks, nails should penetrate at least _____ of an inch.
3/4 of an inch
Typical exposure for standard size (36-inch-wide) strip shingles is _______.
5 inches
For the attachment of counterflashing, the sheet metal receiver is referred to as a _____.
Reglet
An open valley is typically constructed by installing _____ lengths of corrosion-resistant metal from the low point to the high point in the valley.
8-foot or 10-foot
The NRCA recommends crickets at the upslope side of a chimney when the chimney is more than ________.
24 inches wide
Typically, for single-layer underlayment applications, an end lap of __________ is recommended.
4 inches
When installing metal drip edges, the NRCA suggests fastening the drip edge at about ______ on center.
12 inches
A tapered open valley is 16 feet long. The distance between asphalt shingles should be _______.
4 inches greater at the bottom of the valley than at the top
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.
minimum of 24 inches inside the exterior
Specifically, to minimize water leaks, or to deflect water, friction fit sheet-metal_______ is inserted into a mortar cut _______ joint.
reglet, raggle
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 _________.
2-inch minimum
According to the NRCA, asphalt fasteners should be kept back from the center of a valley a minimum of _________.
8 inches
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 ________.
2 inches
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.
2 inches short
The common dimension standard for a three-tab shingle is __________.
12” x 36”
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 _________.
be applied over the sheet
For a metal open valley, a minimum _________ layer of polymer-modified bitumen underlayment is centered in the valley under the field underlayment.
36-inch-wide
When installing a 24-inch taper-split wood shake to a wood board substrate, the recommended fastener is a ________.
5d box, 1-3/4”
Ice dam protection membranes consist of ________.
single-layer applications of self-adhering polymer-modified bitumen sheets
Modified bitumen membrane roods shall have a slope design of not less than _______.
one-fourth unit vertical in 12 units horizontal
How many inches are required for the exposure of roll roofing sheets?
17”
