Detailing : Exterior Wall Assemblies

eu:a eppstein uhen architects 1

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


OUTLINE Exterior Wall Assemblies

Detailing Objectives

Thin-Stone Veneer

Cavity Wall : Brick on CMU


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


Thin-Stone Veneer PROJECTS :

St. Joseph Outpatient Center GE Healthcare Research Park Acuity


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


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


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


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


Thin-Stone Veneer


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


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


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


DOB-1 : Fire (Thermal) Thermal Insulation

2” air space + 2” rigid insulation



Cavity Wall : Brick on CMUDOB-2 : Earth (Solid) Movement : Materials

CMU/ Brick move/ contract at different rates


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


Cavity Wall : Brick on CMUDOB-2 : Earth (Solid) Structural Support : Dead load bearing

system Openings < 6’ : Bond beams Openings > 6’ : Engineered steel lintels


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.



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



DOB-3 : Water (Liquids) : Window Sills



DOB-3 : Water (Liquids) : Window Heads Openings < 6’ : Bond beams Openings > 6’ : Engineered steel lintels



DOB-3 : Water (Liquids) FlashingCavity Wall : Brick on CMU


DOB-3 : Water (Liquids) : Window Jambs



DOB-3 : Water (Liquids) : CopingCavity Wall : Brick on CMU


DOB-3 : Water (Liquids) : Low Roof & Parapet



DOB-3 : Water (Liquids) : Coping/ Roof



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


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.


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.


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.


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


ConclusionQuestions???

Comments???

Concerns???

Suggestions???

Design

Detailing : Exterior Wall Assemblies