19 RESIDENTIAL STRUCTURAL SYSTEM COMPARISON TABLE SYSTEM COMPARISON Residential Framing Options Podium-Level Framing Options Open Web Joist on Metal Stud Bearing Walls HC Precast Plank on Metal Stud Bearing Walls Metal Stud Framing on Metal Stud Bearing Walls Deep Deck/ Shoring on Metal or Wood Stud Bearing Walls Conventional Flat Plate Concrete Concrete on Metal Deck on Steel Beams SYSTEM PROPERTIES Floor System Depth 18" 11" 20" 12" 18 – 24" 24" Maximum Column Bay Size or Member Span 36' 36' 24' 36' 30' x 30' 30' x 30' Structural demising walls Yes Yes Yes Yes No No Architectural features (balconies, bays, saw tooth, irregular, etc.) Yes Yes Yes Yes Yes Yes STC rating 50+ 50+ Depends on finishes 50+ 50+ 50+ Mechanical/electrical distribution (horizontal pipe & duct systems) Yes Yes, in soffit or drop ceiling No Yes, in soffit or drop ceiling Yes, in soffit or drop ceiling Yes, in soffit or drop ceiling PROJECT REQUIREMENTS Cost per square foot $30 $30 $36 $35 $50 $40 Required use of suspended ceilings No Yes Yes Yes Yes No Design flexibility in location of unit demising walls Yes Yes Yes No Yes Yes Soffits No Yes No Yes Yes Yes PROJECT CONSTRAINTS Construction time frame Fast Fast Slower Average Slow Slow Shoring requirements No No Yes Yes Yes No Waiting time before walkability No No No No Yes Yes Waiting time before usability below No No No No Yes Yes Condition of finished slab (floor)/additional preparation required Feather joints with latex cement, install non-structural topping from 1/2" to 2" Feather joints with latex cement, install non-structural topping from 1/2" to 2" Cementateous floor underlayment Feather joints with latex cement, install non-structural topping from 1/2" to 2" Maybe Maybe SUMMARY Competitive advantages/ Disadvantages Fast and typical 15,000 up to 20,000 square feet of panels and deck per week— 1, 2, 3 hr ratings Fast but typically would coordinate between 2 different subs with coordinating crane time More pieces to erect, 16" O.C. Shoring is a disadvantage. Connections and miscellaneous steel. Flexible, but slow and extensive general conditions (dumpsters etc.) Flexible, but slow and extensive general conditions (dumpsters etc.)