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Copyright 2010-2011, Facade Works I Copyright 2010-2011, Facade Works I nc - www.facadeworksinc.com nc - www.facadeworksinc.com Drained/Back-Ventilated Rain Screen Drained/Back-Ventilated Rain Screen System System

Copyright 2010-2011, Facade Works Inc - Drained/Back-Ventilated Rain Screen System

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Page 1: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Drained/Back-Ventilated Rain Screen SystemDrained/Back-Ventilated Rain Screen System

Page 2: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

OBJECTIVESOBJECTIVES

What is Drained/Back Ventilated What is Drained/Back Ventilated rainscreen?rainscreen?

Components of Exterior HPL panels. Components of Exterior HPL panels.

Rainscreen details and installation Rainscreen details and installation methods.methods.

Page 3: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

The Rain Screen The Rain Screen PrinciplePrinciple

• Water/Moisture Water/Moisture ControlControl

• VentilationVentilation

• BreathabilityBreathability

Drained/Back-Ventilated Rain Drained/Back-Ventilated Rain Screen Screen

Page 4: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

RAIN SCREENRAIN SCREEN

Page 5: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

When it rains…When it rains…

.

Panels deflect most of Panels deflect most of the rain water the rain water

Only 15% of the rain Only 15% of the rain enters the cavity & exits enters the cavity & exits at the perforated vent at at the perforated vent at gradegrade

Less than .5% reaches Less than .5% reaches the weather barrierthe weather barrier

Moving air through the Moving air through the cavity helps remove cavity helps remove condensationcondensation

Gap Size between Panels Gap Size between Panels is 5/16” or 8mmis 5/16” or 8mm

Page 6: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

D/B-V RainscreenD/B-V Rainscreen

Based on 2 separate leafs Based on 2 separate leafs (Outer and Inner)(Outer and Inner)

Outer = First line of Outer = First line of defense, Water defense, Water ControlControl

Inner = Secondary line Inner = Secondary line of defense – moisture of defense – moisture barrier, Vapor/Airbarrier, Vapor/Air

Barrier, insulation, Barrier, insulation, structuralstructural

Page 7: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Ventilation & “Breathe-ability”Ventilation & “Breathe-ability”

Open joints and openings Open joints and openings at top & bottom of at top & bottom of façade. façade.

Constant air flow dries up Constant air flow dries up any moisture/rainfall left any moisture/rainfall left inside the cavityinside the cavity

Ventilation cavity allows Ventilation cavity allows hot air to flow upward hot air to flow upward and out of cavity without and out of cavity without penetrating or migrating penetrating or migrating through wall.through wall.

Page 8: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Solar Protection - Air Solar Protection - Air moving through the moving through the cavity prevents heat cavity prevents heat accumulation cooling accumulation cooling the inner layers of the inner layers of the wall assemblythe wall assembly

Reduces the demand Reduces the demand for cooling energy.for cooling energy.

When cold - Air flow When cold - Air flow in cavity is heated by in cavity is heated by building thus causing building thus causing any condensation or any condensation or any penetrating rain any penetrating rain to dry.to dry.

When the sun shines.. or when it’s When the sun shines.. or when it’s coldcold

Page 9: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Components of VRSComponents of VRS

PanelPanel Vertical Support Vertical Support

MembersMembers ““Compartment-Compartment-

ized” air cavityized” air cavity Breathable Breathable

Weather BarrierWeather Barrier

D/B-V Rain Screen System DetailsD/B-V Rain Screen System Details

Page 10: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Improper InstallationImproper Installation

Insufficient Insufficient Ventilation = Ventilation = OxidationOxidation

Insufficient Insufficient Ventilation = Ventilation = Corrosion, dry rot, Corrosion, dry rot, mold, mildewmold, mildew

Page 11: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

HPL Rainscreen Installation HPL Rainscreen Installation MethodsMethods

Exposed Fastener SystemsExposed Fastener Systems Concealed Fastener SystemsConcealed Fastener Systems

Page 12: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

FacadesFacades

Construction Details

Horizontal Sections

Alu-Substructure Riveted

Page 13: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Minimum of 1” Minimum of 1” between laminate between laminate panel and substratepanel and substrate

Ventilation CavityVentilation Cavity

Page 14: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

BaseBase

• Required clearance of 2-4” above ground level to insure adequate air intake.

• Base capped with a ventilation profile

Page 15: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

ParapetParapet

•Top must have a minimum of ¼” clearance between the parapet and panel for proper ventilation

•Air flow is from bottom to top

Page 16: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Vertical Panel JointVertical Panel Joint

Page 17: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Visible Mechanical FasteningsVisible Mechanical Fastenings

Exposed Exposed FasteningFasteningRivets or ScrewsRivets or Screws

Page 18: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Fastening With RivetsFastening With Rivets

•Color coated rivets on an aluminum extruded carrier rail. •Finished product with open expansion joints

Page 19: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

HPL Panels with screws on Wood HPL Panels with screws on Wood SubstructureSubstructure

Rear Ventilation Rain Screen

•Weather / Air Barrier

•Substructure

•Option insulation

•Airspace Between #1 or 3 or 1

Weather Barrier

Insulation

Framing

Page 20: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Aluminum Substructure

Weather Barrier

Insulation

HPL Panels with rivets on Aluminum HPL Panels with rivets on Aluminum SubstructureSubstructure

Page 21: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Each panel should have one fixed point (the hole is the same size as the shaft diameter of the fastener), and the remaining holes are sliding points (the hole size is 1-2mm larger than the shaft size of the fastener).

This allows for hygric movement of the panel.

Screws should not be over tightened or countersunk.

HPL panel manufacturers should be consulted when calculating edge spacing and fastener spacing.

InstallationInstallation

Page 22: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Concealed Fastener SystemsConcealed Fastener Systems

Allows for clean, Allows for clean, aesthetic designaesthetic design

Clips attach to back of Clips attach to back of panel with rivets, then panel with rivets, then mount on rail systemmount on rail system

More labor intensive More labor intensive installationinstallation

Page 23: Copyright 2010-2011, Facade Works Inc -  Drained/Back-Ventilated Rain Screen System

Copyright 2010-2011, Facade Works Inc - Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.comwww.facadeworksinc.com

Concealed Fastener System DetailsConcealed Fastener System Details