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ARE 335 - FINAL > Roofing > Flashcards

Roofing Flashcards

1
Q

What defines a low-slope roof?

A

Slope of 2:12 ratio or less

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2
Q

Can/should a roof be completely flat?

A

No, some slope is needed to drain water efficiently

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3
Q

What is the minimum slope for roofs generally?

A

1/4” per 1’

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4
Q

What is a roof deck?

A

Structural surface that supports the roofing system

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5
Q

What are the three ways to install insulation on a roof?

A

Below the deck
B/w deck and roof membrane
above roof membrane

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6
Q

What is the cheapest and easiest way to install insulation on a roof?

A

Insulation below the deck

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7
Q

What is the best way to install insulation on a roof?

A

Above roof membrane

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8
Q

Three types of membranes:

A

Bituminous
Single-ply
Fluid-applied

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9
Q

What are some defining characteristics of bituminous roof membranes?

A

Most made from asphalt
Typically multiple layers of materials
Two types: Built-up Roof, Modified bitumen

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10
Q

What are some defining characteristics of Built-up roof membranes (BURs)?

A

Oldest low-slope roof membrane system
Overlapping layers of asphalt-saturated felts are bedded in hot asphalt

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11
Q

What are some defining characteristics of Modified Bitumen Roofs (Mod-Bit)?

A

Greater elasticity
Greater durability
Consistent material quality
Bonded by torching

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12
Q

What are some defining characteristics of Single-ply roof membranes?

A

Single layer
Factory made
Plastic and rubber compounds

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13
Q

Upon heating, what type of roof membrane can be re-softened?

A

Thermoplastic

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14
Q

Why can’t thermoset roof membranes be softened when heated?

A

Cross-linking of the molecular chains makes it more chemically stable

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15
Q

What are the benefits of using Thermoset single-ply roof membrane?

A

Better outside of joints
UV resistance
Chemical resistance
Cost

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16
Q

What are the benefits of using Thermoplastic single-ply roof membrane?

A

Better at joints
Better flexibility
Chemical resistance
Easier to repair

17
Q

What are some applications of fluid-applied membranes?

A

Around penetrations, over doubly-curved surfaces, unusual geometric conditions

18
Q

Prefabricated metal roofing panels can be used at slopes as low as:

A

1/4” per foot

19
Q

What is the slope requirement for a steep roof?

A

Greater than 2:12

20
Q

2 roofing systems used for steep roofs?

A

Metal
Tile

21
Q

What are shingles?

A

Small roofing units w/ staggered vertical joints

22
Q

What are the common used woods for wood shingles and why?

A

Cedar, redwood
Naturally decay-resistant

23
Q

What makes a wood shake different than wood shingle?

A

Thicker

24
Q

Briefly define asphalt or composition shingles.

A

Cut from heavy, asphalt-impregnated fiberglass
Surface mineral granules give color, protect from UV degradation

25
Q

What is the life expectancy of Asphalt shingles?

A

15-25 yrs

26
Q

What is the life expectancy of mineral surfaced roll roofing?

A

6-15 yrs

27
Q

What is the minimum slope for slate shingles?

A

4:12

28
Q

What is the durability of slate shingles?

A

60-80 yrs

29
Q

What is the minimum slope for clay and concrete tiles?

A

4:12

30
Q

What is the life expectancy of clay and concrete tiles?

A

30-75 yrs

31
Q

Which steep roof material lasts the longest?

A

Slate

32
Q

Definition of cool roof?

A

Roofs meeting minimum reflectance requirements of green rating systems

33
Q

What are some benefits of green roofs?

A

Reduce noise transmission
Reduce stormwater runoff
Reduce urban heat island effects

34
Q

List some components of green roofs.

A

Plant materials
Soil
filter fabric
drainage layers
Roof deck

ARE 335 - FINAL (7 decks)

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