Detailing : Floor Assemblies

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Detailing : Floor Assemblies

  1. 1. D E T A I L I N G S E M I N A R FLOOR ASSEMBLIES p r e s e n t a t i o n
  2. 2. OUTLINE <ul><li>Floor Assemblies : Overview </li></ul><ul><ul><li>Detailing Objectives </li></ul></ul><ul><li>Composite : Concrete & Steel Deck </li></ul><ul><li>Wood Framed Floors + Ceilings </li></ul><ul><li>Post-Tensioned Concrete Floor </li></ul>
  3. 3. Detailing Objectives <ul><li>DOB-1 : FIRE </li></ul><ul><li>DOB-2 : EARTH </li></ul><ul><li>DOB-3 : WATER </li></ul><ul><li>DOB-4 : AIR </li></ul><ul><li>DOB-5 : COST </li></ul><ul><li>DOB-6 : TIME </li></ul><ul><li>DOB-7 : SCOPE </li></ul>FIRE WATER AIR EARTH dry hot wet cold ELEMENTS TIME COST SCOPE
  4. 4. Composite : Conc & Stl Deck <ul><li>Project : FIRST PLACE </li></ul><ul><li>Project Scope </li></ul><ul><ul><li>7+4 story vertical addition </li></ul></ul><ul><ul><li>Existing structure : CIP concrete </li></ul></ul><ul><li>Height : 12 story </li></ul><ul><li>Floor Determination </li></ul><ul><ul><li>Poor bearing capacity of soils </li></ul></ul><ul><ul><li>Condition of existing structure </li></ul></ul><ul><ul><li>Design and code parameters </li></ul></ul><ul><li>Need : </li></ul><ul><ul><li>Light weight vertical addition </li></ul></ul><ul><li>Solution : </li></ul><ul><ul><li>Composite concrete & steel deck on steel structure </li></ul></ul>
  5. 5. Composite : Conc & Stl Deck <ul><li>Occupancy : </li></ul><ul><ul><li>Separated Mixed Use </li></ul></ul><ul><ul><ul><li>R-2 (multifamily) </li></ul></ul></ul><ul><ul><ul><li>S-2 (parking) </li></ul></ul></ul><ul><ul><ul><li>A-2 (restaurant & café) </li></ul></ul></ul><ul><ul><ul><li>M (Proposed food store) </li></ul></ul></ul><ul><ul><ul><li>B (Dental clinic & office) </li></ul></ul></ul><ul><li>Construction Type : 1B </li></ul><ul><ul><li>Non-combustible </li></ul></ul><ul><ul><li>Construction materials </li></ul></ul><ul><ul><ul><li>Concrete + Steel </li></ul></ul></ul><ul><ul><ul><li>Other non-combustibles </li></ul></ul></ul><ul><ul><li>Rated floor/ceiling assembly : UL D502 </li></ul></ul>
  6. 6. Composite : Design Objectives <ul><li>DOB-1 : Fire (Thermal) </li></ul><ul><li>Conduction </li></ul><ul><li>Balcony : every unit </li></ul><ul><li>Thermal transmission if slab edge is not insulated or not thermally broken </li></ul><ul><li>Design : moving target </li></ul>
  7. 7. <ul><li>DOB-2 Earth (Solid) </li></ul><ul><li>Material Interactions </li></ul><ul><li>Different floor finish materials </li></ul><ul><li>Ceramic tile : </li></ul><ul><ul><li>Substrate : solid + moisture resistant </li></ul></ul><ul><ul><li>Gyp Cement Underlayment </li></ul></ul><ul><ul><li>Tile backer or concrete </li></ul></ul><ul><li>Floating wood floors </li></ul><ul><ul><li>Substrate : solid + very flat </li></ul></ul><ul><ul><li>Gyp Cement Underlayment </li></ul></ul><ul><ul><li>Concrete </li></ul></ul><ul><li>Single flooring system substrate </li></ul><ul><li>Movement </li></ul><ul><li>Building = >300’ long </li></ul><ul><li>Expansion joint required : 2” sliding </li></ul><ul><ul><li>Existing & new floors </li></ul></ul><ul><ul><li>Gypsum board ceilings </li></ul></ul>Composite : Design Objectives
  8. 8. Composite : Design Objectives <ul><li>DOB-3 Water (Liquids) </li></ul><ul><li>Drainage </li></ul><ul><li>Most critical : Slab edge at sliding doors </li></ul><ul><ul><li>Highly defined slab edge detail </li></ul></ul><ul><li>Code : Maximum 3/4” threshold </li></ul><ul><li>Water Pressure Test </li></ul><ul><ul><li>Minimum 10 lb (high rise) </li></ul></ul><ul><li>Sliding doors : recessed 2” into the slab edge </li></ul><ul><ul><li>Code compliant </li></ul></ul><ul><ul><li>Weather resistant </li></ul></ul><ul><li>Other Considerations </li></ul><ul><ul><li>Finish flooring </li></ul></ul><ul><ul><li>Exterior balcony structure </li></ul></ul><ul><ul><li>Exterior finish skin materials </li></ul></ul><ul><ul><li>Flashings </li></ul></ul>
  9. 9. Composite : Design Objectives <ul><li>DOB-4 Air (Vapor) </li></ul><ul><li>Acoustics </li></ul><ul><li>IIC & STC ratings : 60+ (condo’s) </li></ul><ul><ul><li>Concrete : best flooring substrate for condominiums because of its mass </li></ul></ul><ul><li>Vibration loads </li></ul><ul><ul><li>Steel frames absorb & transmit much like gravity loads </li></ul></ul><ul><li>Isolate vibration </li></ul><ul><ul><li>Isolate structural members from sound transmitting assemblies such as ceilings & walls </li></ul></ul><ul><li>Resilient materials below hard surface flooring </li></ul><ul><li>Provide a high density acoustic insulation </li></ul><ul><ul><li>Mineral wool above ceilings (STC requirements) </li></ul></ul><ul><li>Suspended gypsum board ceiling membrane </li></ul><ul><ul><li>Acoustic benefits </li></ul></ul><ul><ul><li>Non-combustible fire protection for steel frame </li></ul></ul>
  10. 10. Composite : Design Objectives <ul><li>DOB-5 Cost </li></ul><ul><li>Labor </li></ul><ul><li>Steel fabrication & erection </li></ul><ul><li>Repetitive members & connections </li></ul><ul><ul><li>Flexible sequencing </li></ul></ul><ul><li>Material costs : high(er) </li></ul><ul><ul><li>Offset by speed of erection </li></ul></ul><ul><ul><li>Mill order = no $ surprises </li></ul></ul>
  11. 11. Composite : Design Objectives <ul><li>DOB-7 Scope </li></ul><ul><li>Aesthetics </li></ul><ul><li>Exposed Concrete = “Industrial Loft” </li></ul><ul><li>Suspended GB ceiling membrane </li></ul><ul><ul><li>Fire protection of steel </li></ul></ul><ul><ul><li>Clean smooth ceiling </li></ul></ul><ul><li>Coordination </li></ul><ul><li>MEP & FP installation </li></ul><ul><ul><li>Difficult due to the numerous steel parts and pieces </li></ul></ul><ul><li>Restricts unprotected MEP penetrations </li></ul><ul><ul><li>Non-rated ceilings : suspended below rated ceilings </li></ul></ul><ul><ul><li>Exposed MEP & FP elements </li></ul></ul>
  12. 12. Detailing – Detail on CD’s
  13. 13. Detailing – Detail on CD’s
  14. 14. Wood : Floor Systems <ul><li>Major Concerns : </li></ul><ul><li>Fire & Smoke Separation : UL & FM </li></ul><ul><li>Acoustic Control : STC </li></ul><ul><li>Vibration Control : IIC </li></ul><ul><li>Structural : Diaphragm & Deflection </li></ul>
  15. 15. Wood : Design Objectives <ul><li>DOB-1 Fire (Thermal) </li></ul><ul><li>Fire & Smoke Separation </li></ul><ul><li>Prevent flame & hot gases </li></ul><ul><li>Sprinkle interstitial spaces (NFPA 13) </li></ul><ul><li>Smoke Compartments (NFPA 13R) </li></ul><ul><li>Smoke and Fire dampers : MEP </li></ul><ul><li>DOB-2 Earth (Wind/Gravity) </li></ul><ul><li>Structural concerns </li></ul><ul><li>Diaphragm (Horizontal) </li></ul><ul><ul><li>T&G sheathing </li></ul></ul><ul><li>Deflection (Vertical) : Bounce </li></ul><ul><ul><li>Floor Finishes : Stone & ceramic tile </li></ul></ul><ul><ul><li>Ceiling Finishes : Control joints </li></ul></ul><ul><ul><li>Nails vs. Screws : Squeaky Floors! </li></ul></ul>
  16. 16. Wood : Design Objectives <ul><li>DOB-3 Water </li></ul><ul><li>Leak Prevention </li></ul><ul><li>Mold prevention : Flashings at exterior (wall + floor) </li></ul><ul><li>Floor drains : thresholds, recessed shower pans </li></ul>
  17. 17. Wood : Design Objectives <ul><li>DOB-4 Air </li></ul><ul><li>Acoustic Control </li></ul><ul><li>Airborne sound vs. Structure borne sound </li></ul><ul><ul><li>STC vs. IIC </li></ul></ul><ul><li>Dwelling units : </li></ul><ul><ul><li>IIC 50 minimum (IBC 2006 1207.3) </li></ul></ul><ul><li>Source for claims : </li></ul><ul><ul><li>Condos need higher STC & IIC </li></ul></ul>
  18. 18. Wood : Design Objectives <ul><li>DOB-4 Air </li></ul><ul><li>Acoustic Control </li></ul><ul><li>Sound reduction strategies </li></ul><ul><ul><li>Decoupling : Sound reduction mats (Acousti-Mat) </li></ul></ul><ul><ul><li>Flexibility : Resilient channels </li></ul></ul><ul><ul><li>Increase mass </li></ul></ul><ul><ul><ul><li>Underlayments + Additional drywall + Mineral wool </li></ul></ul></ul>
  19. 19. Wood : Design Objectives
  20. 20. Wood : Design Objectives <ul><li>DOB-7 Scope </li></ul><ul><li>Coordination </li></ul><ul><li>MEP coordination </li></ul><ul><ul><li>Duct, pipe and cable runs </li></ul></ul><ul><li>Forgiving Details </li></ul><ul><li>Larger dimensional tolerances </li></ul><ul><li>Field modifications </li></ul><ul><li>Finish flooring and gypsum board ceiling can cover most imperfections. </li></ul><ul><li>DOB-5 Cost </li></ul><ul><li>Material & labor </li></ul><ul><li>Wood is cheap! </li></ul><ul><li>Easy fabrication & erection </li></ul><ul><li>Repetitive members & connections </li></ul><ul><li>Flexible sequencing </li></ul><ul><li>Field modifications </li></ul><ul><li>DOB-6 Time </li></ul><ul><li>Schedule & sequencing </li></ul><ul><li>Avoid excess moisture </li></ul><ul><ul><li>Plywood, OSB & GB : absorb water </li></ul></ul><ul><li>Fabrication : short lead times </li></ul>
  21. 21. Resources <ul><li>Gypsum Association </li></ul><ul><li>GA 600-2006 FRDM (18th Edition) </li></ul><ul><ul><li>Free download </li></ul></ul><ul><ul><li>Includes STC/IIC/UL/FM tests </li></ul></ul><ul><ul><li>http://www.gypsum.org/GA60006.html </li></ul></ul><ul><li>United States Gypsum (USG) </li></ul><ul><li>SA100 – Fire-Resistant Assemblies </li></ul><ul><li>SA200 – Acoustical Assemblies </li></ul><ul><li>SA924 – Drywall-Wood Framed Systems </li></ul><ul><li>SA305 – Poured Cementitious Floor Systems </li></ul><ul><li>Underwriters Laboratories </li></ul><ul><li>Online Certifications Directory </li></ul>
  22. 22. Concrete : Post-Tensioned (PT) <ul><li>Project : ASTOR PLACE </li></ul><ul><li>Project Scope </li></ul><ul><ul><li>New Construction </li></ul></ul><ul><ul><li>Light gauge steel frame </li></ul></ul><ul><ul><li>Composite concrete + steel deck </li></ul></ul><ul><ul><li>Structural steel w/metal roof deck </li></ul></ul><ul><li>Height : 18 story </li></ul><ul><li>Floor Determination </li></ul><ul><ul><li>Location + Cost </li></ul></ul><ul><ul><li>Design + code parameters </li></ul></ul><ul><li>Solution : </li></ul><ul><ul><li>Post-tensioned concrete </li></ul></ul>
  23. 23. Concrete : Post-Tensioned (PT) <ul><li>Occupancy : </li></ul><ul><ul><li>Separated Mixed Use </li></ul></ul><ul><ul><ul><li>R-2 : multifamily </li></ul></ul></ul><ul><ul><ul><li>S-2 : parking </li></ul></ul></ul><ul><ul><ul><li>A-2 : tenant spaces </li></ul></ul></ul><ul><ul><ul><li>M : tenant spaces </li></ul></ul></ul><ul><ul><ul><li>B : tenant spaces </li></ul></ul></ul><ul><li>Construction Type : 1A </li></ul><ul><ul><li>Non-combustible </li></ul></ul><ul><ul><li>Construction materials </li></ul></ul><ul><ul><ul><li>Concrete + Steel </li></ul></ul></ul><ul><ul><ul><li>Other non-combustibles </li></ul></ul></ul><ul><ul><li>Rated floor/ceiling assembly : ? </li></ul></ul>
  24. 24. Concrete : Post-Tensioned (PT)
  25. 25. PT Concrete : Design Objectives <ul><li>DOB-1 Fire (Thermal) </li></ul><ul><li>Conduction </li></ul><ul><li>Thermal transmission if slab edge is not insulated or not thermally broken </li></ul><ul><li>Owner : thermal breaks not needed at the cantilevered PT concrete balconies. </li></ul>
  26. 26. PT Concrete : Design Objectives <ul><li>DOB-2 Earth (Solid) </li></ul><ul><li>Material interactions </li></ul><ul><li>Finish Materials </li></ul><ul><ul><li>Finish flooring material to structural </li></ul></ul><ul><ul><li>(A5100; A0010(B4); Underlayment) substrate. </li></ul></ul><ul><li>Ceramic tile & Floating wood floors </li></ul><ul><ul><li>Substrate : solid + moisture resistant </li></ul></ul><ul><ul><li>Gyp Cement Underlayment </li></ul></ul><ul><li>Self leveling Underlayment </li></ul><ul><ul><li>Lower cost of the wood floor installation </li></ul></ul><ul><ul><li>Imperfections : covered up </li></ul></ul><ul><li>Carpet floors </li></ul><ul><ul><li>Do not require the flatness of the above floor finishes </li></ul></ul><ul><ul><li>Standard padding vs. Acoustical carpet pad </li></ul></ul><ul><li>Movement </li></ul><ul><li>Potential for damage or Recurring maintenance </li></ul><ul><li>Differential movement : joints between PT Conc + Steel structure </li></ul><ul><li>Gypsum board ceilings </li></ul><ul><ul><li>GB expansion joints : primary structural members </li></ul></ul>
  27. 27. PT Concrete : Design Objectives <ul><li>DOB-3 Water (Liquids) </li></ul><ul><li>Most critical : </li></ul><ul><ul><li>Slab edge at sliding doors </li></ul></ul><ul><ul><li>Highly defined slab edge detail </li></ul></ul><ul><li>Code : Maximum 3/4” threshold </li></ul><ul><li>Water Pressure Test </li></ul><ul><ul><li>Minimum 12 psf (high rise) </li></ul></ul><ul><li>Sliding doors </li></ul><ul><ul><li>Recessed 1.75” into the slab edge </li></ul></ul><ul><ul><li>Code compliant </li></ul></ul><ul><ul><li>Weather resistant </li></ul></ul>
  28. 28. <ul><li>DOB-3 Water (Liquids) </li></ul><ul><li>Drainage </li></ul><ul><li>Other Considerations </li></ul><ul><li>Finish flooring (1.25” depth) </li></ul><ul><li>Window wall systems </li></ul><ul><li>Wall system transitions </li></ul><ul><li>Typical slab edges </li></ul><ul><li>Roof intersections </li></ul>PT Concrete : Design Objectives
  29. 29. PT Concrete : Design Objectives <ul><li>DOB-4 Air (Vapor) </li></ul><ul><li>Acoustics </li></ul><ul><li>IIC & STC ratings : 60+ (condo’s) </li></ul><ul><ul><li>PT concrete : </li></ul></ul><ul><ul><ul><li>Best structural floor system for condos </li></ul></ul></ul><ul><ul><ul><li>Mass and stiffness </li></ul></ul></ul><ul><ul><li>Isolation of structural members from </li></ul></ul><ul><li>Isolate vibration </li></ul><ul><ul><li>Walls : </li></ul></ul><ul><ul><ul><li>Prevent unit-to-unit sound transmission </li></ul></ul></ul><ul><li>Resilient materials below hard surface flooring </li></ul><ul><li>Provide a high density acoustic insulation </li></ul><ul><ul><li>Mineral wool above ceilings (STC requirements) </li></ul></ul><ul><li>Suspended gypsum board ceiling membrane </li></ul><ul><ul><li>Acoustic benefits </li></ul></ul>
  30. 30. PT Concrete : Design Objectives <ul><li>DOB-5 Cost </li></ul><ul><li>Labor and Materials </li></ul><ul><li>Light gauge steel : 2 story townhomes </li></ul><ul><ul><li>Cost Savings In lieu of PT Conc </li></ul></ul><ul><ul><li>Units : changed to single story </li></ul></ul><ul><li>Deciding Factor : PT Conc </li></ul><ul><ul><li>Height </li></ul></ul><ul><ul><li>Stiffness </li></ul></ul><ul><ul><li>Structural depth </li></ul></ul><ul><ul><ul><li>8” at most residential floors) </li></ul></ul></ul>
  31. 31. PT Concrete : Design Objectives <ul><li>DOB-7 Scope </li></ul><ul><li>Aesthetics </li></ul><ul><li>Concrete structure : concealed </li></ul><ul><ul><li>Buried or wrapped in Gyp Bd </li></ul></ul><ul><li>Perimeter columns (round) are left exposed. </li></ul><ul><li>Coordination </li></ul><ul><li>MEP coordination : during the SD and DD phases </li></ul><ul><ul><li>Various ceiling systems </li></ul></ul><ul><ul><li>Structural penetrations. </li></ul></ul><ul><li>Light gauge steel </li></ul><ul><ul><li>Suspended gypsum board ceiling : fire rated membrane </li></ul></ul><ul><ul><li>Restricts the number & size : unprotected MEP penetrations. </li></ul></ul><ul><ul><li>Coordination with MEP & FP </li></ul></ul><ul><ul><li>System design : parameters of the code. </li></ul></ul>
  32. 32. Conclusion <ul><li>Questions??? </li></ul><ul><li>Comments??? </li></ul><ul><li>Concerns??? </li></ul><ul><li>Suggestions??? </li></ul>
  33. 33. Detailing : Sequencing B. Mtl studs + balcony structure & decking A. Steel structure + composite floor slab C. Exterior sheathing + plywood blocking + weather barrier @ frames D. Mtl flashing @ frames E. Exterior weather barrier over sheathing F. Frames installed G. Exterior finish (EIFS) + sealants + exterior wall insulation H. Interior vapor barrier + floor topping I. Interior gyp bd + window stool + finishes (wall & floor)

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