johns hopkins hospital nelson-harvey building … · 2016. 12. 16. · thermal performance and....

Over-cladding forThermal Performance andBuilding Resiliency

JHH Nelson Harvey Building 1979

presenters:Daniel McKelvey AIA, LEED AP, NIBS David Copley AIA, LEED AP, CSI Allison Wilson, AIA, LEED AP BD+C

JOHNS HOPKINS HOSPITAL

NELSON-HARVEY BUILDING

Thermal Performance of the Exterior Envelopes of Whole Buildings XIII International Conference

Presentation Outline• The aging building inventory• Challenges in design• Proposed over-cladding strategy• Digital tools required for analysis & design• Details of the over-cladding assembly• Sustainability metrics and energy modeling• Demolition to construction

Presentation outline


West Façade of Nelson-Harvey Building in context with hospital campus

ZayedBuilding

Circa 2010CMSCBuilding

Circa 1960s

BillingsBuilding

Circa 1880s

Nelson HarveyBuilding

Circa 1970s


Site aerial of project site – The Johns Hopkins Hospital System, Balt imore, Maryland

Thermal Performnce of the Exterior Envelopes of Whole Buildings XIII International Conference

East façade of Nelson-Harvey Building as viewed from entry forecourt

OslerBuilding

Circa 1930s

NelsonHarvey

BuildingCirca 1970sPhipps

BuildingCirca 1910s


West façade of Nelson-Harvey Building as viewed from courtyard

NelsonHarvey

BuildingCirca 1970s

Roof of JeffersonBuilding

Circa 1950s

CMSCBuilding

Circa 1960s

HalsteadBuilding

Circa 1930s

CourtyardRoof of CAT scan

Terrace Restaurant


Key Issues for DesignTechnical Challenges:

• Increase thermal performance• Masonry as predominant cladding material• Provide an air & water barrier• Provide fire / smoke containment to enhance

building resilience• Limit cladding system weight (5% dead load

threshold for steel structural members, 10% building lateral)

• Aggressive design & construction schedule• Lower 2 levels fully occupied & accessible during

construction• Limit disturbance to hospital operations

Key issues for design


Typical Existing Wall• Masonry wall supported from steel lintels• Lack of masonry expansion joints• No insulation in cavity wall construction• Aging flashings • Parged cementitious coating on CMU as air

barrier• Thermally displaced masonry (no brick EJs)• Failing glazing system (non-insulating)• Exterior wall not code compliant for resisting

lateral imposed loads

Existing Condit ions

FireproofedSteel lintel

Composite slab

Composite slab

Steel structure

Ribbon windows

4” brick2” air space4” CMU w/parging

Ceiling & bulkhead

Steel structure


Code & Performance Implications• Provide horizontal & vertical fire and smoke

separation in new and existing cladding.• Relieve lateral loading on existing envelope• Transfer lateral and gravity loads to steel

frame only• Comply with current Baltimore City Building

Code and ASHRAE standards• Achieve Baltimore City Green Building

Systems 2 Green Star certification (LEED Silver equivalent)

Building code and performance implications

Lateral force

Fire &Smoke

Convective air movement and stack effect

Solar heatgain

Moisture

Thermaltransfer

Heat loss


Exterior Cladding SystemStrategy…• “Recycle in-place” the existing masonry and

and incorporate into new hybrid mass wall• Remove excess deadload from structure• Construct new structural frame for cladding -

outboard of existing wall face• Structural supports supporting precast needled

through existing wall to steel frame• Compartmentalize new and existing vertical &

horizontal cavities in exterior wallsNot viable:• Removing existing brick (and/ or) block and

reconstructing cavity wall

Employed envelope strategy


“Recycle in-place” concept diagram for new cladding

New ‘outboard’ structural frame system

New steel outriggerwelded to existingstructural frame

Connection points to the existing structural frame-at the column with steel outriggers.

Existing masonrycavity wall

Existing steel& concretefloor deck

New cladding systems are supported from the frame


View of exist ing elevation from Wolfe Street entry prior to demolit ion

ARTS + SCIENCES

Masonry Demolit ion shown in red Window and curtain wall demolit ion in blue

ARTS + SCIENCES

Patient Tower Wall Demolition• Remove failing fiber-fireproofing on steel• Remove all interior walls • Existing windows removed• Remove exterior masonry wall to just below

floor line at patient room areas• Selective demolition in masonry to expose

existing steel

Wall demolit ion at patient tower

Steel lintel

Composite slab

Composite slab

Steel structure

Ribbon windows


Ceiling & bulkhead

Steel structure


Materials PaletteWall systems• Precast panel - thin-brick mechanically bonded to thin-precast CFMF concrete panel.System thickness of 2-1/2” brick/concrete on 6” CFMF = 8 ½” overall thickness. • Aluminum curtain wall - thermally broken curtain wall with fluoropolymer coating,

insulating glazing, low-iron glass with ceramic frit and low-E coating• Metal panel system - aluminum panel with foamed-in-place poly-iso core on CFMF

Roof systems• PVC membrane – fully-adhered protected roofing membrane assembly (PRMA) over

insulation & protected with insulating concrete topped roof pavers• Green roof - extensive field system

Other systems • Sloped glazing systems (skylights)• Perforated aluminum panel on galvanized steel framing (screen wall)


Nelson Harvey Building east elevation prior to over-cladding


Aerial view from the east of proposed elevation - Wolfe Street Entry Forecourt

MeyerBuilding

Circa 1980s

PhippsBuilding

Circa 1910s

ZayedBuilding

Circa 2010s

East Elevation – new cladding

ARTS + SCIENCES

Thin-brick & thin-shell precast panelsGlazed aluminum curtain wall

Insulated Aluminum panels

Aluminum louvers

Extensive green roof

Entrance Canopy and vestibule

Existing aerial view from Broadway of Nelson Harvey

Proposed aerial view from Broadway of Nelson Harvey

Aerial view from the west of proposed elevations – Meyerhoff Courtyard

ZayedBuilding

Circa 2010s

CMSCBuilding

Circa 1960s

BillingsBuilding

Circa 1880s

Nelson HarveyCourtyard

Circa 1970s

Roof of JeffersonBuilding

Circa 1950s

MeyerBuilding

Circa 1980s

OslerBuilding

Circa 1930sHalstedBuilding

Circa 1930s

West Elevation – new cladding

ARTS + SCIENCES

Thin-brick & thin-shell precast panels

Perforated aluminum screen wall

Insulated aluminum panels

Glazed aluminum curtain wall

Brick & CMUcavity wall

Sloped glazing system

Extensive green roof

Existing Brick Displacement

Measurement of displacement necessary for detailing overcladding solutions…

• Survey collected data from 37 different locations over a 2 day period

• Construct accurate 3 dimensional model of surfaces for subsequent analysis

• Analysis and incorporation of data into Revit

Digital laser survey of existing building envelope


Analysis of data from digital laser survey

Incorporation of cloud measurement data into the BIM model. Illustrating the variances in wall plane


Thin-Precast Wall Section• Panels span floor to floor and column to

column• Vertical and lateral loads transferred to

structural frame • Fully insulated panel with insulation added

between panels after erection for continuity.• Firestopped horizontally at each floor and

vertically between cladding systems.• Compartmentalization limits stack effect• System depth of 8-1/2” and installed @ 1” clear

from face of existing wall.

Thin-precast wall section

Composite slab

Cementitiousfireproofing on all steel

Thin-precast panel section

New interior partitions and finishes

Steel structure


Exterior cladding – thin-precast

6” galvanized CFMFwith ½” dia. Nelson studs

HD galvanized reinforcing

2” high-strength precast concretewith fiber reinforcing

Thin-brick withdovetail slots formechanical bond

3.5” (R- 21) sprayed-onpolyurethane insulationon back of concrete

½” thermal break between concrete and CFMF

Thermal break

Nelsonstud

Precast concrete

Open cellbacker rod

Inner sealant

Drain strip

Exterior sealant

Sealant dam

WeepVisible Watermark

Thin-brick & thin-precast/CFMF panel system

Precast double sealed joint system

R Value = R-24.5Weight = 30 lbs./sq. f t .


27Exterior cladding – glazed aluminum curtain wall

Low iron glassLow-E coated #2 surface

Low iron glassLow-E coated #2 surface

Low iron glass60% ceramic frit #2 surfaceLow-E coated #2 surfaceOpacified coating #4 surface



SSG joint

SSG joint

Exter ior

Inter ior

1

2 3

4

Glazed surfaces inInsulat ing glass

¼” dot fritted glass

U Factor = 0.26

SHGC = .2626% of solar heat transmitted

VT = 0.6868% of visible light transmitted

Vision Glass metrics

Thermally-broken aluminumframing. Exterior glazed

Patient Tower Wall Demolition

Wall demolit ion at patient tower

Steel lintel

Composite slab

Composite slab

Steel structure

Ribbon windows


Ceiling & bulkhead

Steel structure


Curtain Wall Section

Glazed curtain wall section

Composite slab


Visionglazing


Steel structure

Spandrelglazing

Spandrelglazing


Curtain Wall Section• Attachment to horizontal structural tube

spanning between columns at each floor limits thermal bridging

• Vertical and lateral loads transferred to structural frame

• Fully insulated spandrel condition including mullion covers for insulation continuity.

• Firestopped horizontally at each floor and vertically between cladding systems.

• Compartmentalization limits stack effect• System depth of 7-1/2” and installed @ 3” clear

from face of existing wall.• Floors extended to face of existing brick

Glazed curtain wall section

Composite slab


Visionglazing


Steel structure

Spandrelglazing

Spandrelglazing


Exterior cladding – insulated metal panel

Insulated aluminum panel system

Aluminum panel system

R Value = R-14Weight = 4 lbs./sq. f t .

Aluminum rainscreen

Pressure equalized chamber

Drip edge

Capillary break

Interior seal

Interior baffle

Air and vapor barrier

Concealed fastener

2”of polyurethaneinsulation

GalvanizedCFMFGalvanizedplate

DoubleSealant strip

Insulated metalvertical joint

Insulated aluminum panel

Horizontal joint detail

Vertical joint detail

4” Galv. CFMF

MetalPanel

Face ofexistingmasonrywall

Fire stopping

SupportAngle atFloorline



213071 TRUCKS

Reduced demolition avoided

Tons of masonry hauled inReduced airborne dust and demolition noise for occupied buildings

Prefabrication reduced waste with offsite fabrication of thin-brick precast concrete

Sustainabil ity Metrics


Existing Cladding

Increase in the insulation value of the building walls

227%Material R-Value % of cladding Weighted Avg

Brick/CMU Cavity Wall 9.20 88 8.10

Brick/CMU Parapet 4.00 2 0.08

Metal Panels 14.34 10 1.43

100 9.61 AVG R-value

New Hybrid: Existing cladding with over-claddingMaterial R-Value % of cladding Weighted Avg

Thin Precast Panel 33.17 35 11.61

Thin Precast Panel Parapet 24.00 2 0.48

Type C1-Spandrel 29.15 6 1.75

Type C2-Spandrel 29.60 6.5 1.92

Type D-Spandrel 29.60 15 4.44

Metal Walls Panels 31.66 35.5 11.24


Performance Metrics


Existing Roofing

Increase in the insulation value of the building roofs with the new roofing

258%Material R-Value % of cladding Weighted Avg

PVC w/ insulated pavers 11.17 100 11.17 R-value

New RoofingMaterial R-Value % of cladding Weighted Avg

PVC adhered insulated 43.04 60 25.80

Green Roof 35.54 40 14.22


PVC membrane: PRMA with concrete topped insulating roof pavers: high emissivity system

Green roof: Extensive field system with sedum plantings.

Performance Metrics


Energy model projection of improvement over the baseline building pEUI

Square feet

14,281Wall Area (Including “glazed” wall) WWR

Square feet

82,808Vision glazing

17%

Performance Metrics & Energy Modeling

Vision Glazing Total

17%Improvement


New east curtain wall system

New thin-brick precast wall panel system 8” precast wall system/insulated at interior

Nelson Harvey Building Adjacent Building

Curtain wall and precast wall system

View of exist ing elevation from Wolfe Street entry

ARTS + SCIENCES

Materials Palette

CFMF integrally poured with concrete and foamed insulation applied to back of panel


Materials Palette

Cleaned and repointed panel ready for shipment


Materials Palette

Interior demolit ion


Materials Palette

Nelson Harvey Building with precast erection and selective demolit ion underway


Nelson Harvey Building precast installat ion on south façade of elevator core


Materials Palette

Nelson Harvey Building east elevation


Materials Palette

Close-up of curtain wall installat ion


Materials Palette

East elevation curtain wall glazing installat ion underway


Materials Palette

Nelson Harvey Building east elevation curtain wall glazing installat ion underway


Nelson Harvey Building east elevation curtain wall installat ion


Materials Palette

Nelson Harvey Building west elevation curtain wall installat ion viewed from courtyard


Nelson Harvey Building west elevation with green roof and courtyard


Nelson Harvey Building east elevation and forecourt


Nelson Harvey Building new east elevation


Nelson Harvey Building east main entrance canopy at drop-off


Nelson Harvey Building east main entrance elevation


Nelson Harvey Building daylighted lobby/wait ing area


Nelson Harvey Building daylighted reception/lobby area


Nelson Harvey Building patient room


THANK YOU!


QUESTIONS?

Daniel McKelvey AIA, LEED AP, NIBS [email protected]

David Copley AIA, LEED AP, CSI [email protected]

Allison Wilson, AIA, LEED AP BD+C [email protected]

mailto:[email protected]



johns hopkins hospital nelson-harvey building … · 2016. 12. 16. · thermal performance and....

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