BDCS Flashcards
What is heat-strengthened glass and how is it often used
Plate glass that is made opaque by a ceramic glaze that is fused over the surface. Used exclusively for spandrel glazing I’m curtain walls
Explain the finishing of metals exposed to weather
Alkyd based paint preferred over oil based. Paint should be of the same base type. Coal-tar enamel used if under ground or water
Name the 4 basic types of cement and their common use
Type I - normal
Type II - moderate sulfate resist, SOG
Type III - high early strength(high heat), cold weather
type IV- low heat, large pours & hot weather
Type V- sulfate resisting.
Bulb tee
Used in gypsum conc deck construction. Connected to main structure. Upside down “T”. Planks rest on flange. Gap from edge of plank to tee web is filled with gypsum grout.
What are the three grades of glulam construction
Premium
Architectural
Industrial
What is the purpose of strip panel coatings on aluminum frame windows?
Minimize corrosive damage caused by alkalis found in wet concrete mortar and plaster
Gypsum partition tiles and blocks are held together with this
Gypsum mortar
The apartment building on the rue Franklin in Paris designed by Auguste Perret is known as the first to do what?
Employ the use of reinforced concrete framing
Blisters in built up roof decking are caused by what.
The formulation and concentration of moisture and or air anywhere within the build up assembly
Concrete having a low water cement ratio is what?
Stronger and more resistant to freezing and thawing
How does excessive bleeding affect concrete
Weakens the surface of concrete
Class A Door: Location, hours
3 hour, fire walls between buildings or building divisions. 100si max glass per leaf. Auto closing or self closing
Class B door
1.5 hour, stair wells. 100si max glass per leaf. Self closing
Class C door
45min, opening to corridor or in room partitions. 1296 si max glass per leaf. Self closing
Class D door
1.5 hour, exterior wall opening. No glass permitted. Self closing
Type v construction
Frame construction. Wood frame
Type III construction
Joisted masonry. Masonry walls, wood roof.
Type IV construction
Heavy timber
Type II construction
non-combustible. (Light gage metal studs)
Type IB construction
Fire resistive non-combustible. Mid rise office and group R.
Type IA construction
Fire resistive non-combustible. High rise
What is calcium chloride?
Accelerant add mixture
What is the mathematical relationship between the U-factor (thermal conductance) and R-value (thermal resistance)?
The reciprocal of U is R therefore the thermal conductance (U) of one square foot of R-30 batt insulation is 0.03
Ancient roman structure consisting of a 143 foot diameter some resting on a circular masonry wall
Pantheon
Building of the Chicago school considered to be the first iron-and-steel-framed sky scraper
Home Insurance Building
What is the main reason light gauge metal studs are used in place of wood?
A degree of fire resistance is required that is unobtainable with wood.
A process where zinc dust is applied under great heat to metal to impart corrosion resistance
Sherardizing
How does aluminum react when exposed to weather?
Thin film of oxide which causes the surface to become dull and chalky
Copper and stainless steel do what at about the same rate?
Expand and contract
Material used for flashing that is commonly painted to minimize corrosion
Galvanized sheet metal
Process that employs an electric current and an Electrolux solution to deposit a metallic coating on steel is called
Electroplating
In glulam beams better grade lumber is used where and why?
In the outer laminations because this is where the flexural stresses are higher
The greatest drying shrinkage of lumber is in which direction?
Across the grain rather than parallel
When should add mixtures be added to a batch?
Before or during mixing. Never after
Glass block is always set in what pattern?
Stacked bond. Running bond creates pressure points. Blocks cannot be cut and a running bond requires the use of half pieces at the ends
Damp proofing cannot resist…
Constant hydrostatic pressure
In the design of metal gutters one must be concerned with what?
Roof pitch, roof area, cross sectional gutter area
What is the main difference between the installation of wood shingle versus asphalt shingles
Wood shingles are installed over spaced strips while asphalt shingles must be installed over solid sheathing
Damp proofing most often involves the application of _________, not the use of ___________, which are used in waterproofing.
Liquid coatings, membranes
If terrazzo is installed over wood substrate how is the inherent movement of the structure mitigated
It is isolated from the wood by a membrane and sometimes a layer of sand
Name the three main factors that have contributed to the economy of high rise construction
Advancements in the steel rolling process, high speed elevators, improved connection methods such as welding and high strength bolting
How should one remedy trapped air or moisture bubbles in built up roofing
Puncture the bubble and resurface that specific area
Typically structural costs amount to what percent of the total construction cost?
25%
What does adding hydrated lime to mortar do to the mixture
increases workability and water retention
what type of tree does soft wood come from
evergreen
what type of tree does hard wood come from
deciduous
What is the purpose of a cant strip
To allow the felt layers to be slightly bent instead of 90 degrees where breakage would likely occur
What happens to concrete as the waster cement ratio increases
The strength decreases
Where does the vapor barrier go?
On the warm or room side. Vapor barrier is different from water proofing. I’m california there would be no need for the vapor barrier generally
