Bld Construction Questions Flashcards
What is the max allowable area of glass in fire doors with 1, 1.5, and 3 hour ratings?
100 square inches
a three dimensional truss structure is called a _____
space frame
What is the primary cause of spalling?
The expansion of excess moisture within the concrete when it is either heated or when it freezes.
The strength of wood varies significantly with __, __, and __.
Species, grade, and direction of load with respect to grain
How long does the firing process for bricks take?
40 to 150 hours
Slab and beam concrete framing is __ and is best suited for buildings with __
Extremely light weight; light floor loads
Is a parapet wall only for appearance?
No, it can also be required by building code to provide a barrier to the communication of fire between closely spaced buildings
Allowable compressive strength parallel to the grain varies from __ to __ for commercially available grades and species of framing lumber.
325 to 1700 psi; Compressive strength
What is the slope of a low sloped roof?
Less than 3 to 12 pitch
With Lightweight trusses that are gang nailed the individual members would be wooden __ or __ and individual trusses would be spaced __ to __ feet apart
2x4s or 2x6s and 2 to 4 feet apart
Because roofs are designed for lighter live loads than floors are, it is not unusual for modern flat roofs to __ as personnel walk across them.
Deflect or vibrate noticeably
Is new concrete or old concrete subject to more severe spalling?
New concrete
Why is wood not used for lintels in modern construction?
Shrinkage problems
What is the most common size of asphalt shingle?
12x36 inches
How would a small wood building with no interior finish material be classified under the building codes?
Type V-B
What are the 12 major occupancy classifications used by NFPA 5000 and NFPA 101.
Assembly, Educational, Day care, Health care, Ambulatory health care, detention and correctional, residential, residential board and care, mercantile, business, industrial, storage
When bricks are placed end-to-end they create a __
Stretcher course
Natural and developed terrain features that may complicate access by emergency responders include___(6)
Steep slopes, rivers, landscaping, narrow roadways, setbacks, and security barriers
What interval might nailing strips be placed in cast in place roof decking?
Intervals of 3 feet
Doors with a ___ rating may not be subjected to the hose test depending on their intended application.
1/3 hour
What is the main difference between the designations of enclosure wall and partition walls?
Their function; their construction is very similar, but enclosure walls block the vertical spread, and partitions block horizontal.
What is the simplest pitched roof?
The shed roof that only slopes in one direction
Advantages of intumescent and mastic coatings?
Lighter weight, durable surfaces, good adhesion, and most aesthetically pleasing
For glazed windows in fire doors, ___ requires that each piece of glass installed in a fire door has a listing mark that is visible after installation.
NFPA 80, Standard for fire doors and fire windows
Bridge cables can have strengths as high as __
300,000 psi
What are some advantages of using precast concrete? (3 things)
Higher degree of quality control, Work can proceed more quickly at the job site, and they can be produced using a polystyrene core
Lamellas vary from __ to __ and in lengths varying from __ to __ feet
2x8 to 3x16 inches; 8 to 14 feet
Fire resistance describes properties of a material such as _________
Combustibility, thermal conductivity, chemical composition, density, and dimensions
What are the 3 types of joints for glulam beams?
Butt, scarf, and finger joints
Dewatering operations will be necessary because water at a depth of _ inches adds a static load of __ pounds per square foot
3, 21
What is the most commonly used test for determining combustibility? (Standard)
ASTM E-136 “Standard test method for behavior of materials in a vertical tube furnace at 750 degrees C”
What is cellar decking?
When a sheet of flat steel is welded to the bottom of corrugated steel decking
Common structural steel has less than __ of one percent carbon.
three tenths of 1% — 0.3%
How long does it take the flame to travel 24 ft for the red oak floor?
5.5 minutes
What are some examples of fire retardant coatings? (4 things)
Intumescent paints, mastics, gas forming paints, and cementitious and mineral fiber coatings
Corbelling is only used where ___
The architectural style makes it attractive
Building codes usually exclude surface treatments such as paint and wall paper that are no thicker than __
1/28th an inch
Which type of gypsum board is usually required where a specified fire resistance is desired?
Type X
Gypsum has the advantage of being __
Nailable; precast concrete can also be nailable with the appropriate aggregate
For type 1 construction, a code may allow the use of fire retardant treated wood in ___
Roofs or interior partitions
When was ASCE SFPE 29 developed?
1997
Surface coating with a fire retardant mainly is used to reduce ___
The flame spread rating
when a structural support system can support a load equal to or greater than the applied loads, what exists?
Equilibrium
In contemporary practice, the most commonly used insulating materials for steel are (4 things)
gypsum, spray-applied materials, and intumescent coatings; sometimes lightweight concrete
How do most fire retardant chemicals work?
By accelerating charring
The fire resistance of a concrete assembly is affected by the following variables: (5 things)
Concrete density, concrete thickness, concrete quality, load supported, and depth of concrete over reinforcing bars
Course of bricks with the ends of the bricks facing outward.
Header course
Normal design strength of concrete is reached after ___
28 days
Is wood stronger parallel or perpendicular to the grain?
Parallel
The extent of spalling depends on __
The amount of excess moisture and the length of time that has passed since the concrete was placed
Do the vertical members of steel rigid frame buildings need to be rigidly connected to the foundation.
No, they can be, but they do not have to be. This will depend on anticipated wind loads
When did precasting concrete become more common?
After WW2
Particleboard is used for ___
Flooring in manufactured and mobile homes
Wood panel roof decking may have a thickness of __ on supports __ on center.
1/2 inch; 24 inches on center
Light gauge steel joists are produced with depths of __ to __ inches and can be spaced __ to __ apart.
6 to 12 inches spaced 16 to 48 inches apart
What are the formal identifications for the steiner tunnel test
ASTM Standard E84 and UL 723
Beams and columns in steel-frame buildings are connected by one of two methods:
Bolting or welding; Riveting was used in the early 1900s but is no longer practical
The speed at which flame will spread over the surface of a material is referred to as the ___.
Surface burning characteristics of the material
What factors are used to evaluate hazard severity in wildland urban interface?
Ground slope, clear space around, water supply, and climate
Some building codes contain a provision to omit the fire resistive rating for a roof construction for some occupancies when the roof is located more than ___ feet above the floor.
20 feet
Masonry units can be made of several materials, including the following: (7 things)
Brick, Terra cotta, Concrete block, Stone, Clay tile block, Gypsum block, Glass
With interior framing of masonry buildings, travel of fire through the floor and ceiling spaces should be anticipated just as with wood frame construction, especially where __
Truss joists are used
factors that influence fire behavior include ___(4)
Basic building classifications, occupancy classifications, fire or fuel load, fire resistance
NFPA 256
Standard method of fire tests of roof coverings; also designated ASTM E-108
Two commonly encountered applications of the basic steel truss are __
Open web joist and the joist girder
Rafters are the standard supports used in __ style roofs, although trusses can also be used for these roof types. (5 types)
shed, gable, hip, gambrel, and mansard style roofs
The ___ test is the only method currently universally accepted by building codes.
E-119 (NFPA 251)
Lamella arch roofs have been used for occupancies such as __ (3 things)
Gymnasiums, exhibition halls, and auditoriums
Firewalls can be constructed either as ___ or as ___.
Freestanding walls or as tied walls
Letter classifications for fire door openings - Class A
Opening in fire walls
How much carbon does cast iron have?
3 to 4%
The firefighter must understand that the behavior of steel under fire conditions depends on __ and __
The mass of the steel and the degree of fire resistance provided.
__ are designed to create extra living space and allow additional light into the structure.
Dormers
Flame spread rating for veneered woods
515 (approx)
building construction and occupancy classifiactions are used together in building codes to establish___________
limitations on the permissable heights and open areas of the buildings
What is the most common size of concrete block?
8x8x16
Can louvers be installed in any fire door?
No, only doors that are listed for the installation of louvers
What are the three general categories of membrane roofs?
Built up roof membranes, single-ply membranes, and fluid-applied membranes
LVL is made from __
The outer portions of the log
An intumescent material will expand __ to __ times its original volume
15 to 30 times
The use of a membrane ceiling (drop ceiling) can provide a floor and ceiling assembly or a ceiling and roof assembly with af fire rating of __ to __ hours
1 to 3 hours
How do fire doors differ from oridinary doors?
Construction, Hardware, and automatic closures
What are the six test procedures in the NFPA 256 test?
Intermittent flame exposure test, burning brand test, flying brand test, rain test, weathering test, and spread of flame test
What is the application thickness of intumescent materials?
0.03 to 0.4 inches
Floor construction for type 1 construction is required to have fire resistance of ___
2-3 hours
With simple frame, the joints are designed primarily to support a __
Vertical force
Are concealed spaces permitted between structural members in Type 4 construction?
NO
The height of the parapet of a firewall above a combustible roof is determined by the building code and varies from ___
18 to 36 inches
What is the range of compressive strength for mortar?
75 psi to 2,500 psi
For type 3 construction, interior structural members including walls, columns, beams, floors, and roofs are permitted to be __
Partially or wholly combustible
Asbestos sidings were commonly used from the __ until the __
1930s to 1970s
sources of vibration on a structure include:
Natural, wind and seizmic, building related, ventilation system motors, or external, vehicular traffic, trains
What is a safety reason for coloring concrete?
When it is placed over buried electric cables
_____ and ______ trusses are the most common types used for pitched roofs
Fink and Pratt
Which style of roof are the easiest for firefighters to work?
Flat roofs
Underwriters Laboratories annually publishes a ___ , which lists assemblies that have been tested and their fire resistance ratings
Fire resistance directory
the pressure exerted by the soil against the foundtation is known as the ____, whereas the force of the foundation against the soil is known as the _____
active soil pressure, passive soil pressure
If the height of the wall above the opening is shorter than the height of the triangular section, it is assumed that the lintel must ___
Support the entire weight of the masonry above the opening.
What is the design function of the curtain wall?
To separate the interior environment from the exterior environment
A geodesic dome can be constructed from __ (6 things)
Wood, steel or concrete as well as plywood, bamboo, and aluminum
An intumescent material will __ when heated (3 things)
Char, foam, and expand
The outward thrust of the rafters is resisted by __ or __ that are in tension.
Ceiling or attic floor joists or collar ties
fire resistance describes several properties of a material, including____(5)
combustibility, thermal conductivity, chemical composition, density, dimensions
Codes limit the max smoke developed to ___
450
How are fire resistance ratings expressed?
In hours and fractions of hours
How many layers of roofing felt is a common design for built up membranes?
FOUR layers
What is fire resistance a function of? What are material properties related to fire resistance? (5 properties)
The properties of all materials used, including combustibility, thermal conductivity, chemical composition, density, and dimensions.
Flame spread rating for treated douglas fir plywood
15-60
Can single ply membranes accommodate for shifting in a building?
Yes because it stretches
concrete has a high ____ strength, but low ____ strength
compressive, tensile
what is the vertical shaft in which the elevator car travels, and includes the elevator pit?
Hoistway
Usually, louvers in doors are closed by means of a ___
Fusible link
The drainage layer of a roof can be __ (3 things)
The ballast layer in a single ply roofing system, a drainage fabric, or the aggregate used in a built up roofing system
The building process begins when a developer or project owner perceives _____
a need
Some structures, such as certain churches and mansions, have roofs with slopes of __ or greater. Too steep to work from a roof ladder.
18/12 or greater
The butterfly roof is a roof style that slopes in two directions – basically two shed roofs that meet at their __
Low eaves
Freestanding walls must be designed to resist a lateral load of at least ___
5 pounds per square feet
types of fire-retardent coatings availiavle include:(4)
Intumescent coatings, mastics, gas-forming paints, and cementitious and mineral fiber coatings
Flame spread rating for gypsum wallboard
10-15
NFPA 5000
Building construction and safety code
The top of the steel rigid frame is known as the __ and the point where the inclined members meet the vertical members are known as the __
Crown; knees
Particleboard can be manufactured in sizes up to ___
8 by 40 feet
What are some unique causes to wood that make it vulnerable to deterioration? (3 things)
Insects, Decay, and shrinkage
Laminated members can be produced in depths ranging from ___ to ___ and lengths up to.
3 to 75 inches, lengths up to 100 ft
Flame spread rating for mineral acoustic tile
15-25
A variety of techniques, such as __ can be used to connect precast structural elements. (3 things)
Bolting, welding, and posttensioning
Building codes generally allow an increase in the flame spread rating of interior finish materials in buildings equipped with __
An automatic sprinkler system
A property of a given column, known as its ____ is used in combination with the condition of the column end to determine the load that can be safely supported without buckling
Slenderness ratio
Firestopping can consist of various materials including ___ (5 specific things)
2 inch nominal lumber, gypsum board, cement fiber board, batts or blankets of mineral wool, glass fiber, or other approved materials
Where might impact resistant gypsum board be used?
Correctional or school facilities, made with fiber glass mesh
What are the two attributes that building classifications are based on?
materials used in construction and the fire resistance ratings required for the structural components
Beam and girder steel frames can be classified as __, __, or __.
Rigid, simple, or semi-rigid
Will fog corrode a metal roof?
YES
When a mansard roof is constructed with a flat deck on top it may be called
a modern mansard or deck roof
Fire resistance is __
The ability of a structural assembly to maintain its load bearing capacity and structural integrity under fire conditions
What are metals used to cover horizontal sliding doors? (3 things)
Steel, galvanized sheet metal, and terneplate (tin and lead composite)
Letter classifications for fire door openings - Class D
Openings in exterior walls subject to severe fire exposure from the outside of a building
Masonry units have no significant __
Tensile strength
In gabled rigid frames, the top of the rigid frame is known as the ____ and the points where the inclined members intersect the vertical members are known as the _____
crown, knees
In many applications such as residential and small commercial buildings, wood joists or beams simply rest on the masonry wall in an indentation known as a ___
Beam pocket; a metal strap may be provided to function as a horizontal tie between the masonry and the end of the beam.
How are the fire ratings of roof coverings classified?
Class A (severe fire exposure), Class B (moderate), Class C (light)
Joint systems for floor to wall and wall to wall connections are tested in accordance with ___
UL standard 2079 “Standard for Fire Tests of Joint Systems”
Firefighters should always assume a masonry wall will fall out a distance at least equal to
1.5 times the height
Do wood shingles have the be nailed to a solid deck?
No, they can be nailed to an open deck with wood strips which may cause early failure in a fire
Corrugated steel used in roof decking ranges from __, the thinnest to __ , the thickest.
29 gauge to 12 gauge; the overall depth varies from 3/4 to 2 inches
How large can the individual particles in particleboard be?
1 inch
Are prestressed or ordinary reinforced concrete systems more vulnerable to failure?
Prestressed
ASCE/SFPE 29 standard is limited to use with what materials? (5 things)
Structural steel, plain and reinforced concrete, timber and wood, concrete masonry, and clay masonry
Tilt up walls can be __
Several stories high
When can the IRC - residential code govern over the IBC?
One and two family dwellings not more than 3 stories
What are the flame specs for the steiner tunnel test?
5000 BTU flame
What is the effect called where concrete will absorb heat from a fire and then slowly release it after the fire is extinguished?
Heat sink effect
building codes require a minimum of one ________ for stairs serving buildings five stories or higher.
smokeproof stair enclosure
The flanges of an I-beam can be made of __ or __.
Laminated veneer lumber or solid wood lumber
What is a designation for high strength steel?
A242
NFPA 220
Standard on types of building construction
Low density fiber materials for spray applied materials are not suitable for __
Exterior use; Use materials that have densities greater than 20 lb/cu ft
At what temperature does pyrolysis begin?
Somewhere below approx. 392 degree F
How are light gauge steel joists produced?
From Cold rolled steel
Heat Release Rate definition
Total amount of heat produced or released per unit time. the heat release rate is typically measured in kilowatts or megawatts of output
When a structural specimen is tested, the test is continued until ___ or ___
The specimen fails or the specified time for which the specimen being tested is reached
When was light frame construction introduced to the united states?
in the 1830s
unique stresses are caused by external load alignments including _____(3)
axial, eccentric, and torsional loads
The __ style roof has a break in the slope of the roof on all four sides. It forms a projection beyond the building wall that creates a concealed space through which a fire can travel
Mansard roof
Tied fire walls are erected at a ___
Column line in a building of steel frame or concrete frame construction
LVL finds application in ___.
I-Joists and beam sections 1 3/4 to 3 1/2 inches thick
Balloon framing has not been widely used since __
the 1920s
The hip roof slopes in __ directions and has a degree of slope similar to the gable roof
Four directions
Dimensional lumber is available in lengths from __ to __ feet
8 to 24 feet
Do some building codes provide exceptions for the parapet portion of a firewall?
YES
Which type of roof usually has a more complex roof covering, flat or pitched?
Flat, because they drain more slowly
The minimum dimensions for floor joist construction in Type 4 would be __
nominal 6 x 10
In contemporary practice, when a building is to be more than __ or __ stories tall, the use of a steel or concrete structural frame is usually more economical than erecting a nonreinforced masonry bearing wall
Three or four stories
Masonry walls usually collapse as a result of ___
The collapse of the interior wood framing
ll stair types have basic components in common, the step has ___ and the ____, commonly referred to as the run and rise.
tread and riser
Another term for rated assembly is ___
Labeled assembly and fire rated
Doors rated at ___ are normally required for 2 hour rated vertical enclosures
1.5 hours
What are the two methods to perform quality control of concrete?
The slump test or the compression test
If bricks are placed vertically on end, a __ is created
Soldier course
What type of connection is designed to resist the bending forces resulting from the supported loads and lateral forces?
Rigid frame connections
The standard test fire assumes an ___ and ___ to produce increasing temperatures.
Endless fuel supply and adequate ventilation