Detailing : Exterior Wall Assemblies

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Detailing : Exterior Wall Assemblies

  1. 1. D E T A I L I N G S E M I N A R EXTERIOR WALL ASSEMBLIES p r e s e n t a t i o n
  2. 2. OUTLINE <ul><li>Exterior Wall Assemblies </li></ul><ul><li>Detailing Objectives </li></ul><ul><li>Thin-Stone Veneer </li></ul><ul><li>Cavity Wall : Brick on CMU </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. Thin-Stone Veneer <ul><li>PROJECTS : </li></ul><ul><ul><li>St. Joseph Outpatient Center </li></ul></ul><ul><ul><li>GE Healthcare Research Park </li></ul></ul><ul><ul><li>Acuity </li></ul></ul>
  5. 5. Thin-Stone Veneer <ul><li>Panelized thin-stone veneer wall panels </li></ul><ul><ul><li>Manufacturer : Biesanz Stone Co </li></ul></ul><ul><li>Assembly includes </li></ul><ul><ul><li>1-1/4” Winona Dolomite Limestone </li></ul></ul><ul><ul><ul><li>Stone is held in place with threaded studs </li></ul></ul></ul><ul><ul><ul><li>Epoxy-anchored into back of stone panels </li></ul></ul></ul><ul><ul><li>6” welded structural stud frames </li></ul></ul>
  6. 6. Thin-Stone Veneer <ul><li>DOB-1 Fire (Thermal) </li></ul><ul><li>Conduction </li></ul><ul><li>4” Polyurethane Insulation </li></ul><ul><li>Sprayed in stud cavity </li></ul><ul><ul><li>Encapsulates metal studs </li></ul></ul><ul><ul><li>R5 per inch = R20 </li></ul></ul><ul><li>Sprayed after panels are placed </li></ul><ul><ul><li>Monolithic installation (+) </li></ul></ul><ul><li>Cannot be exposed : Fire hazard </li></ul><ul><ul><li>Ceiling plenum or </li></ul></ul><ul><ul><li>Other occupied spaces </li></ul></ul><ul><li>Must be covered by </li></ul><ul><ul><li>Gypsum Board or </li></ul></ul><ul><ul><li>Sprayed-on fire resistive coating </li></ul></ul>
  7. 7. Thin-Stone Veneer <ul><li>DOB-2 Earth (Solid) </li></ul><ul><li>Panels : welded to floor edge framing </li></ul><ul><li>Edge framing designed for deflection criteria : </li></ul><ul><ul><li>Panel to panel or </li></ul></ul><ul><ul><li>Panel & window system </li></ul></ul>
  8. 8. Thin-Stone Veneer <ul><li>DOB-3 Water (Liquids) </li></ul><ul><li>Barrier system </li></ul><ul><ul><li>No drainage cavity </li></ul></ul><ul><ul><li>Water infiltration barrier </li></ul></ul><ul><ul><ul><li>stone veneer </li></ul></ul></ul><ul><ul><ul><li>epoxy joints </li></ul></ul></ul><ul><ul><ul><li>sealant joints </li></ul></ul></ul><ul><li>Closed-cell polyurethane insulation </li></ul><ul><ul><li>helps to keep water out of assembly </li></ul></ul><ul><li>Flashing placed : </li></ul><ul><ul><li>under handset copings and window sills </li></ul></ul><ul><ul><li>at top of foundation wall </li></ul></ul>
  9. 9. Thin-Stone Veneer
  10. 10. Thin-Stone Veneer <ul><li>DOB-4 Air (Vapor) </li></ul><ul><li>Insulation acts as vapor barrier </li></ul><ul><ul><li>Closed cell </li></ul></ul><ul><ul><li>3” or more thickness </li></ul></ul><ul><li>DOB-5 Cost </li></ul><ul><li>Comparable to precast </li></ul><ul><li>Life cycle costs </li></ul><ul><ul><li>Very good </li></ul></ul><ul><ul><li>Very low maintenance </li></ul></ul><ul><ul><ul><li>Sealant at panel joints </li></ul></ul></ul><ul><ul><ul><li>Periodic replacement </li></ul></ul></ul>
  11. 11. Thin-Stone Veneer <ul><li>DOB-6 Time </li></ul><ul><li>Labor </li></ul><ul><ul><li>Prefabricated panels </li></ul></ul><ul><ul><li>Ease of installation </li></ul></ul><ul><li>Panels can be large </li></ul><ul><ul><li>Building enclosure fast </li></ul></ul><ul><li>All-weather construction </li></ul><ul><ul><li>Easily installed during winter </li></ul></ul><ul><li>DOB-7 Scope </li></ul><ul><li>Aesthetics </li></ul><ul><ul><li>Natural stone product </li></ul></ul><ul><ul><li>Mix of lights and darks </li></ul></ul><ul><ul><li>Very high quality look </li></ul></ul><ul><li>Coordination </li></ul><ul><ul><li>Similar to precast panels </li></ul></ul><ul><ul><li>Shop drawings must be accurate </li></ul></ul><ul><ul><li>Errors in the field </li></ul></ul><ul><ul><ul><li>Pull epoxy-ed stone from panels : difficult </li></ul></ul></ul>
  12. 12. Cavity Wall : Brick on CMU <ul><li>Project : </li></ul><ul><ul><li>UW LaCrosse Residence Hall </li></ul></ul><ul><li>Project Scope </li></ul><ul><ul><li>Occupancy : R-2 </li></ul></ul><ul><ul><li>Construction Type : Type IIB </li></ul></ul><ul><li>Need : </li></ul><ul><ul><li>Provide a building that meets the Department of State Facilities (DSF) longevity requirements : </li></ul></ul><ul><ul><ul><li>100 yr building </li></ul></ul></ul><ul><li>Concerns : Costs </li></ul><ul><li>Solution : </li></ul><ul><ul><li>Provide a century old building system </li></ul></ul><ul><ul><ul><li>Provide a brick/ block cavity rain screen wall system </li></ul></ul></ul>
  13. 13. <ul><li>DOB-1 : Fire (Thermal) </li></ul><ul><li>Thermal Insulation </li></ul><ul><ul><li>2” air space + 2” rigid insulation </li></ul></ul>Cavity Wall : Brick on CMU
  14. 14. Cavity Wall : Brick on CMU <ul><li>DOB-2 : Earth (Solid) </li></ul><ul><li>Movement : Materials </li></ul><ul><ul><li>CMU/ Brick move/ contract at different rates </li></ul></ul>
  15. 15. Cavity Wall : Brick on CMU <ul><li>DOB-2 : Earth (Solid) </li></ul><ul><li>Movement : Elements </li></ul><ul><ul><li>Horizontal movement : Vertical control joints (24’ o.c.) </li></ul></ul><ul><ul><li>Vertical movement : Horizontal shelf angles </li></ul></ul><ul><ul><ul><ul><li>Every two floors or 30’ brick heights </li></ul></ul></ul></ul>
  16. 16. Cavity Wall : Brick on CMU <ul><li>DOB-2 : Earth (Solid) </li></ul><ul><li>Structural Support : Dead load bearing system </li></ul><ul><ul><li>Openings < 6’ : Bond beams </li></ul></ul><ul><ul><li>Openings > 6’ : Engineered steel lintels </li></ul></ul>
  17. 17. <ul><li>DOB-3 : Water (Liquids) </li></ul><ul><li>Sealant Joints and Gaskets </li></ul><ul><ul><li>Provide flashing at all horizontal interruptions in a wall. </li></ul></ul><ul><ul><ul><li>Opening Heads </li></ul></ul></ul><ul><ul><ul><li>Opening Sills </li></ul></ul></ul><ul><ul><ul><li>Shelf angles </li></ul></ul></ul><ul><ul><ul><li>Foundations </li></ul></ul></ul><ul><li>Drain & Weep </li></ul><ul><ul><li>Water drained from cavity thru a series of weeps. </li></ul></ul><ul><ul><li>Do not use rope weeps. </li></ul></ul><ul><ul><li>Need to provide vents at top of cavity (similar to weeps only located at top of cavity. </li></ul></ul><ul><ul><ul><li>Vents help equalize cavity pressure </li></ul></ul></ul><ul><ul><ul><li>Provide air movements to help dry cavity out. </li></ul></ul></ul>Cavity Wall : Brick on CMU
  18. 18. <ul><li>DOB-3 : Water (Liquids) </li></ul><ul><li>Rainscreen Assembly </li></ul><ul><ul><li>Cavity wall system utilizes the rain screen principal to control water </li></ul></ul><ul><ul><li>Water </li></ul></ul><ul><ul><ul><li>Allowed to penetrate the outer layer </li></ul></ul></ul><ul><ul><ul><li>Directed out of the cavity thru the use of flashing + counter flashing systems </li></ul></ul></ul><ul><ul><li>Sprayed on Air & Moisture Barrier utilize to control air & moisture vapor penetration </li></ul></ul>Cavity Wall : Brick on CMU
  19. 19. <ul><li>DOB-3 : Water (Liquids) : Window Sills </li></ul>Cavity Wall : Brick on CMU
  20. 20. <ul><li>DOB-3 : Water (Liquids) : Window Heads </li></ul><ul><ul><li>Openings < 6’ : Bond beams </li></ul></ul><ul><ul><li>Openings > 6’ : Engineered steel lintels </li></ul></ul>Cavity Wall : Brick on CMU
  21. 21. <ul><li>DOB-3 : Water (Liquids) Flashing </li></ul>Cavity Wall : Brick on CMU
  22. 22. <ul><li>DOB-3 : Water (Liquids) : Window Jambs </li></ul>Cavity Wall : Brick on CMU
  23. 23. <ul><li>DOB-3 : Water (Liquids) : Coping </li></ul>Cavity Wall : Brick on CMU
  24. 24. <ul><li>DOB-3 : Water (Liquids) : Low Roof & Parapet </li></ul>Cavity Wall : Brick on CMU
  25. 25. <ul><li>DOB-3 : Water (Liquids) : Coping/ Roof </li></ul>Cavity Wall : Brick on CMU
  26. 26. Cavity Wall : Brick on CMU <ul><li>DOB-4 : Air (Vapor) </li></ul><ul><li>Water Vapor </li></ul><ul><ul><li>Air Barrier </li></ul></ul><ul><ul><li>Placement : Critical </li></ul></ul><ul><ul><li>Warm side : CW insulation </li></ul></ul><ul><li>Cavity </li></ul><ul><ul><li>Keep Clean : Critical </li></ul></ul><ul><ul><li>1” Minimum </li></ul></ul><ul><ul><li>2” Preferred </li></ul></ul>
  27. 27. Cavity Wall : Brick on CMU <ul><li>DOB-5 : Cost </li></ul><ul><li>Life-Cycle Issues </li></ul><ul><ul><li>Cavity Wall : </li></ul></ul><ul><ul><ul><li>4” face brick </li></ul></ul></ul><ul><ul><ul><li>2” air space </li></ul></ul></ul><ul><ul><ul><li>2” rigid insulation </li></ul></ul></ul><ul><ul><ul><li>8” CMU </li></ul></ul></ul><ul><ul><li>Time tested assembly </li></ul></ul><ul><ul><ul><li>Over century old </li></ul></ul></ul><ul><ul><ul><li>Research performance sources : numerous </li></ul></ul></ul><ul><li>Material Costs $28-$36 / s.f. </li></ul>
  28. 28. Cavity Wall : Brick on CMU <ul><li>DOB-6 : Time </li></ul><ul><li>Expected Life </li></ul><ul><ul><li>100 year building assembly </li></ul></ul><ul><li>Life-Cycle: </li></ul><ul><ul><li>Maintenance : Minimal </li></ul></ul><ul><ul><ul><li>Sealant/ tuck pointing </li></ul></ul></ul><ul><li>Efficient Use of Const Materials </li></ul><ul><ul><li>Labor intensive </li></ul></ul><ul><ul><ul><li>Built one block/ brick at a time </li></ul></ul></ul><ul><ul><li>Refining the Detail </li></ul></ul><ul><ul><li>Critical : Specify a mock-up panel </li></ul></ul><ul><ul><ul><li>Show wall system components and openings </li></ul></ul></ul><ul><ul><ul><li>Used to review finished work </li></ul></ul></ul><ul><ul><ul><li>Provides objective comments/ concerns </li></ul></ul></ul><ul><li>All-Weather Construction </li></ul><ul><ul><li>Majority of winter construction cost (65-75%) </li></ul></ul><ul><ul><ul><li>Temporary heat and protection of masonry </li></ul></ul></ul><ul><ul><ul><li>Keep project moving </li></ul></ul></ul><ul><li>Pride of Craftsmanship </li></ul><ul><ul><li>Craftsmanship intensive </li></ul></ul><ul><li>Parts That Are Easy To Handle </li></ul><ul><ul><li>Installation is easy. </li></ul></ul>
  29. 29. Cavity Wall : Brick on CMU <ul><li>DOB-7 : Scope </li></ul><ul><li>Aesthetics </li></ul><ul><ul><li>Natural materials+organic : from the earth </li></ul></ul><ul><ul><li>Different colors/ textures/ bricks/ bonding </li></ul></ul><ul><ul><li>Patterns can provide interest in a project </li></ul></ul><ul><ul><li>Timeless Features : Never goes out of style </li></ul></ul><ul><li>Coordination : S + MEP </li></ul><ul><ul><li>Critical for any recessed component. </li></ul></ul><ul><ul><li>Electrical requires conduit/ boxes to be set with wall. </li></ul></ul><ul><ul><li>Do not install pipes inside cavity wall. </li></ul></ul><ul><ul><li>Need to create pipe chases on warm side of wall. </li></ul></ul>
  30. 30. Cavity Wall : Brick on CMU <ul><li>DOB-7 : Scope </li></ul><ul><li>Forgiving Details : Dimensional Tolerances </li></ul><ul><ul><li>Maintain an 8” building module to minimize cutting </li></ul></ul><ul><ul><li>All openings need to be kept on 8” module also </li></ul></ul>
  31. 31. Conclusion <ul><li>Questions??? </li></ul><ul><li>Comments??? </li></ul><ul><li>Concerns??? </li></ul><ul><li>Suggestions??? </li></ul>

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