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