CME 203 Exam 2

Lumber shrinkage direction (across grain)

Occurs across the grain (width and thickness)

Drying effects on wood

Causes shrinkage

Board vs dimension vs timber

Classified by size (thickness and width): boards (<2 in thick)

Board foot calculation

(Thickness in inches × Width in inches × Length in feet) ÷ 12

Heavy timber fire resistance

Large members char on outside

Wood connectors (nails/screws/bolts)

Nails = cheap/fast; screws = strong/clamping/removable; bolts = highest strength for heavy loads

Firecut

Angled cut at beam end in masonry wall to allow collapse without pushing wall outward

Balloon framing

Continuous studs from foundation to roof; more shrinkage and fire spread risk

Platform framing

Floor-by-floor construction; safer

Mortar functions

Bonds units

Mortar ingredients

cement, lime, sand, water

Brick temperature effects

Higher firing temperature = darker color and more shrinkage

Brick bonds/patterns

Arrangement of bricks (e.g.

Bricklaying leads

Corner sections built first to ensure wall is level and plumb

Masonry wall types

Load-bearing (structural)

Structural steel (hot-rolled)

Used for primary structure (beams/columns); high strength

Light-gauge steel (cold-formed)

Thin steel members used for framing walls and floors

Light-gauge steel bracing

Diagonal bracing

Light-gauge steel vs wood frame

Steel = stronger

Brick veneer curtain wall

Non-load-bearing brick attached to structural frame

Horizontal expansion joint

Allows movement from temperature/moisture changes

Glass cladding

Exterior glass panels for aesthetics

Aluminum cladding advantages

Lightweight

Stick system

Built on-site piece by piece (curtain wall)

Unitized system

Prefabricated panels installed on-site

Unit and mullion system

Mix of preassembled units and vertical mullions

Panel system

Large prefabricated wall panels installed as units

Column cover and spandrel system

Covers structural columns and floor edges with cladding panels

Roofing underlayment

Waterproof layer beneath roofing material for extra protection

Drip edge

Metal flashing at roof edge to direct water away from fascia

Roof ventilation

Allows airflow to prevent moisture buildup and heat accumulation

Ice damming

Ice buildup at roof edge from poor ventilation

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Aluminum (curtain walls) NOT advantage

Poor insulator

Stick system

Components assembled on-site piece by piece

Unitized system

Prefabricated units assembled off-site and installed as panels

Panel system

Preassembled homogeneous sheet metal panels with glass infills spanning floor to floor

Column-cover and spandrel system

Column covers connected to spandrel panels spanning column to column

Thermal break

Minimizes heat transfer between interior and exterior

Curtain wall incorrect statement

Does NOT require fire-stopping (this is false; it does require it)

Storefront system

Supported directly by floor below and assembled on site

Window wall

Supported by slab below and braced by structure above

Housewrap (Tyvek)

Reduces air infiltration/drafts

Ice dams cause

Heated air in an uninsulated and unvented attic

Light gauge steel NOT characteristic

Susceptible to decay and termites

Light gauge steel characteristic

Thermally inferior

Light gauge steel characteristic

Dimensionally stable

Light gauge steel characteristic

Unaffected by humidity

Light gauge steel characteristic

Noncombustible

Brick veneer backup wall NOT suitable

None (all listed are suitable)

EIFS NOT component

Posttensioning tendons

EIFS components

Foam insulation board + base coat + reinforcing mesh + finish coat

Steel stud backup walls do NOT

Carry loads of brick/stone panels

Steel stud backup walls do

Support interior finish

Steel stud backup walls do

Carry insulation

Steel stud backup walls do

House electrical wiring

Horizontal expansion joints (brick veneer)

Accommodate movement and prevent cracking