Ch 11 Flashcards
What was one of the first fire hazards addressed for roofs
Thatched roofs
What loads are roofs designed to support
Live loads
What are the 3 types of roofs
Flat
Pitched
Curved
What way do flat roofs slope
Front to rear
What do flat roofs facilitate
Drainage
What is the slope of a low roof
3/12
What is the slope of a med-high pitched roof
4/12-12/12
What roof is easiest to work on
Flat
What buildings have 18/12 or greater roofs
Churches
Mansions
What determines the design of a roof
Climate
Aesthetics
Function
What is the simplest pitched roof
Shed
What roof has 2 inclined surfaces and forms a ridge
Gable
Which roof slopes in 4 directions
Hip
What roof slopes in 2 directions and has a break in the slope on each side
Gambrel
Which roofs have a break on all 4 sides
Mansard
Which roof has 2 shed roofs
Butterfly
Which roofs are designed to provide light and ventilation
Monitor
What buildings are monitor roofs installed on
Factory
What roof has glass vertical sections that face North
Sawtooth
What roof is supported by arches and bowstring
Curved
What is the lemella arch constructed from
Lemellas
What is lemella most commonly made of
Wood
What is the thickness range of lemellas
2x8-3x16
What is length range of lemellas
8-14 ft
How is a geodesic dome created
Spherical triangulation
What is provided in the pitch to create living space
Dormer
What beams support flat roofs
Box
I-beams
What is a variation of a flat roof
Inverted
What roofs are constructed with conventional framing
Shed Gable Grambel Mansard Hip
What are rafters commonly made of
Wood
What is the size range of rafters
2x4-2x14
How far are rafters placed apart
12-24 in
Pre-engineered roof framing is known as
Trusses
What are the 2 sizes of trusses
2x4
2x6
How far are trusses apart
2-4ft
What trusses are most commonly used in pitched roofs
Bow string
What trusses have a curved top chord
Bowstring
What materials are used in arches
Masonry
Wood
Steel
What is the portion of the deck material is applied
Roof deck
What are the components of the roof deck
Sheathing
Planks
Purlins
What decking is used for both deck and exterior roof coverings
Corrugated Steel
What are the 2 common types of trusses used in pitched roofs
Fink
Pratt
What is the thickness of wood paneling
1/2 in
What is the gauge range of corrugated steel
29-12
What is the advantage of gypsum
Nailable
What type of barrier is used to reduce the moister to insulation
Vapor barrier
What are the 3 categories of membranes
Built
Single
Fluid
How many layer is common for roof felt
4
How wide are rolls of roofing felt
3 ft
How long do built up roofs last
20 yrs
How wide are sheets of single ply
10 or 20 ft wide
How long is the roll for single ply
Up to 200ft
How are single ply membrane attached to the roof
Gravel
Adhesive
Mechanical
What is the most common synthetic rubber material
EPDM
What type of roof is fluid members applied on
Curved/Dome
What are the 2 types of roof coverings for pitched roofs
Shingle
Metal
What is thatch primarily used for
Decorative
What is the base material for shingles
Fiberglass
What is the common size of shingles
12x36
What are wooden shingles made from
Tree trunks
What trees are wooden shingles made from
Red Cedar
White Cedar
Redwood
How are shingles and tiles attached to the roof
Corrosion resistant nails
What are the 3 types of tiles
Clay
Slate
Concrete
What are the operational problems with tile
Loose
Slippery
Brittle
What are slate tiles produced from
Hardened rock
How long can slate last
150 yrs
What does slate weigh
8-36lbs per sq ft
Which tiles are known as mission tiles
Clay
What is a major advantage of concrete tiles
Longevity
Where are metal roof coverings commonly used
Industrial
Agriculture
What NFPA tests roof coverings
256
What is class A covering rating for fire
Severe
What is class B covering rating for fire
Moderate
What is class C covering rating for fire
Light
What is a buildings 1st line of defense against the elements
Roof
What type of pitch will a new rain roof have
Steeper
What roof increases the efficiency of the building
Green
What is a significant hazard of a green roof
Added weight
What are reflective systems known as
Cool roofs
What are biodiverse roofs known as
Brown roofs
What cells are typically shaped like a shingle or panel
Photovoltaic
What materials are used for skylights
Plastic
Wired glass
Tempered glass
What is the thickness of wood planks
Min 1in
What is the depth variation of corrugated steel
3/4-2”
What are normally openable windows on monitor roofs called
Clerestories
Above how many feet is fireproofing omitted from roof supports in an assembly occupancy
20
What is deflection and vibration an indication of
Lightweight roof construction
What is the size range of slate
1/16 to
1 1/2
What tiles have preset nail holes
Slate
What occurs when dissimilar metals are in contact
Galvanic corrosion
What is a Mansford roof with a flat deck sometimes called
Modern Mansford
What roofs are Clerestories found on
Monitor
What roofs are found on industrial buildings
Sawtooth
What roofs are found on factories
Monitor
Which design of truss joint permits rapid spread of fire in directions perpendicular to the truss joist
Open web
What truss assembly uses split ring connectors at all joist except the heel plates
Bowstring
How far apart are wood nailing strips embedded in the concrete
3 ft
What roofing membrane uses a torch to heat the underside of the membrane
Single ply
What protects the roof from mechanical abrasion
Wear course
Built up roofs that use gravel as the wear course are commonly known as
Tar and gravel
What is the dead load weight added by a green roof
20-150 lbs/per sq ft
What does a green roof increase
Air quality due to O2 and CO2 exchange
What is added to the front of a flat roofed building as an architectural design
False Mansard Front
What can be thought of as an arch rotated 360 degrees
A dome
What is a keystone
Top point
What are lamellas bolted together with
Lamella washer
What is the range of thickness for single ply membrane
.03-.10
What forces can be visually identified and evaluated
Exterior
What forces must be calculated
Interior
What will be the last portions of the assembly to fail
Joints
What type of frame will the joints be the last to fail under fire conditions
Rigid Frame
What is an indication of roof failure
Saggy
What is an indication of the roof before failure
Spongy
What truss is arranged with all chords in the same plane
Common truss
What type of covering is a roof
Waterproof
What fails quickly in a fire
Open web joists
What are the 2 types of poured insulation
Portland Cement
Gypsum
