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RRO > Roofing Science > Flashcards

Roofing Science Flashcards

1
Q

How many degrees above dewpoint temperature should the ambient temperature be for SPF

A

5 degrees

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2
Q

Roofing should not be installed below how many degrees?

A

40 degrees

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3
Q

Roofing should not be installed above how many degrees?

A

85 degrees

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4
Q

Can asphalt roofing be installed directly on gypsum sheathing?

A

No. Typically ashpalt roofing is installed over a base sheet if installed over a nailable surface like plywood, gypsum, or light-weight concrete.

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5
Q

A light-weight pre-manufactured concrete panel that is attached to the structural steel beams and joists via clip attachment. They consist of a thin cross section and are considered non-nailable.

A

Channel slabs

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6
Q

What does EVT stand for in relation to asphalt

A

Equiviscous temperature

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7
Q

The precise location where fluid roofing material is being applied.

A

point of application

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8
Q

What is the correct temperature at the point of application for asphalt roofing?

A

EVT +- 25 degrees

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9
Q

What is the maximum kettle temperature specified by ASTM D312 for asphalt.

A

550 degrees

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10
Q

How many degrees below the flash point should the kettle remain at all times?

A

25 degrees below the flash point

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11
Q

Flash point

A

the minimum temperature at which a liquid gives off vapor within a test vessel in sufficient concentration to form an ignitable mixture with the air near the surface of the liquid.

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12
Q

What type of asphalt should be used for “dead level” roofing applications

A

Type I - This type is rarely used and is considered the lowest asphalt grade. Softening point is 68 degrees. used in slag and gravel surfaced roofs on inclines up to 1/4”/ft

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13
Q

What type of asphalt should be used for “flat” (low slope) roofing applications

A

Type II - moderately susceptible to flow. used on built up roofs with slopes from 1/4”/ft up to 1/2”/ft. This type is most commonly used.

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14
Q

What type of asphalt should be used for “ steep” BUR roofing applications

A

Type III - relatively non-susceptible to flow. It is used on built up roofs with slopes above 1/2”/ft to 3”/ft. Can be used on vertical curbs and flashings

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15
Q

What type of asphalt should be used for “special steep” roof applications

A

Type IV - relatively non-susceptible to flow. It is used on built up roofs with slopes above 3”/ft to 6”/ft It is useful in areas where relatively high year-round temperatures are experienced.

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16
Q

In built up and Mod Bit systems, voids in the inter ply moppings due to inconsistent installation or insufficient fluid volume is the primary cause of what deficiency?

A

blistering.

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17
Q

What is the minimum depth the nails should penetrate through the plywood when the sheathing is at least 3/4”?

A

3/4”

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18
Q

If the roof deck is less than 3/4” what is the minimum through penetration of the nails at the back side of the sheathing?

A

1/8”

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19
Q

What is the maximum recommended roof slope for coal tar pitch?

A

1/4”/foot max

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20
Q

What is the physical property of coal tar vs asphalt that has the greatest impact on how it performs and ages.

A

coal tar has permanent fluidity and low softening point which means it is perpetually susceptible to flow. Asphalt hardens over time.

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21
Q

What two board sizes are polyisocyanurate provided in?

A

4x4 and 4x8

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22
Q

What is the maximum recommended size for polyisocyanurate in adhered applications?

A

4x4. 4x8 can be used in loose laid and mechanically attached.

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23
Q

What are the standard minimum head laps for slate tile roofing?

A

4” for 4:12 to 8:12
3” for 8:12 to 20:12
2” for greater than 20:12

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24
Q

What ASTM document describes the four different types of asphalt and what conditions they should be used?

A

ASTM D312

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25
Q

All asphalts meeting the ASTM D312 should have what characteristics.

A

Homogeneous and free from water

26
Q

What ASTM standard describes specifications and requirements for asphalt shingles?

A

ASTM D3462

27
Q

What slope is standing seam appropriate for metal roof and what slope is flat seam (welded)?

A

Standing seam 3:12 or greater

Flat seam 3:12 or less

28
Q

How wide are roofing felts in BUR.

A

3 feet

29
Q

Vapor drive is in what direction

A

Hot to cold

30
Q

What insulation is the only one recommended for wet conditions?

A

EPS
Extruded poly styrene

31
Q

Insulation fasteners should be a minimum of how many inches from the edge of the board?

A

6”

32
Q

Temperature at which the viscosity of bitumen is optimum for application

A

Equi viscus temperature

33
Q

What is the difference in asphalt felts between residential shingles and built up roofing

A

Built up roofing felts are perforated so the asphalt can bleed through.

34
Q

Between APP and SBS which is mopped and which is torched down?

A

APP torched
SBS mopped

35
Q

Which single-ply membrane resists chemicals and animal fats?

A

PVC

36
Q

XPS

A

Expanded polystyrene (styrofoam), closed cell

37
Q

Which rigid insulation has the highest published r-value?

A

Polyisocyanurate

38
Q

Long name for EPDM

A

Ethylene propylene diene monomer

39
Q

What material breaks down PVC?

A

Asphalt which accelerates plasticizer migration which can cause it to become brittle. Plasticizer gives membrane its flexibility.

40
Q

What is used to separate PVC from asphalt based waterproofing tie in?

A

Aluminum tape.

41
Q

Two single-ply roofing types that are sensitive to chemicals and grease.

A

TPO and EPDM

42
Q

Two single-ply roofing types resistant to chemicals and grease.

A

PVC and KEE

43
Q

What is KEE?

A

Ketone Ethylene Ester

44
Q

Bitumen based SAF often used for flashing transitions will not permanently stick to which single ply roofing?

A

TPO

45
Q

Coal tar is described by what standard?

A

ASTM D450

46
Q

What attachment method does NRCA not recommend for rigid board insulation for steel roof decks?

A

low rise foam adhesive

47
Q

When installed in a single layer, rigid insulation should be

A

Mechanically attached and not allowed to overhang the rib openings

48
Q

What is the NRCA recommended spacing between penetrations, parapets and curbs on the roof?

A

12” minimum clearance between elements and 2’ between curb and parapet.

49
Q

Does NRCA recommend sealant at the bottom exterior vertical face of a coping cap or metal edge flashing and building exterior?

A

No. As it does not add to the waterproofing integrity and may hinder the ability of the wall construction to dissipate moisture.

50
Q

What is the minimum NRCA-recommended overlap between coping vertical leg and exterior finish.

A

1”

51
Q

What is the correct sizing for a drain sump?

A

24” plus the drain bowl diameter.

52
Q

Members and registrants of IIBEC should hold what things paramount?

A

The safety, health, and welfare of the public.

53
Q

Some building codes require the use of water and ice-dam protection membranes in areas where the mean January temperature is:

A

25 degrees Ferenheit or less.

54
Q

When ice-dam protection is specified what is the minimum width?

A

Generally 24” measured from the inside face of the exterior wall toward the interior.

55
Q

What is the mixing ratio between Part A and B components of Sprayed Polyurethane Foam (SPF)

A

1:1

56
Q

Tack-free time

A

A curing phase of SPF that lasts until the material is no longer sticky.

57
Q

What are the principal contributing factors to variations in the surface texture of SPF.

A
  • Equipment Adjustment
  • Environmental Effects/conditions
  • Applicator technique
58
Q

What SPF surface textures are considered acceptable for receiving elastomeric surfacing?

A

Orange peel, coarse orange peel, and verge of popcorn.
(popcorn and treebark are not acceptable)

59
Q

What is the typical minimum base flashing height for horizontal to vertical transitions?

A

8” above the deck.

60
Q

What are the minimum SPF lift thickness and final thickness?

A

Minimum 1/2” per lift. Minimum 1” total thickness.

RRO (1 decks)

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