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
Mar 28, 2015
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Drained/Back-Ventilated Rain Screen SystemDrained/Back-Ventilated Rain Screen System
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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.
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The Rain Screen The Rain Screen PrinciplePrinciple
• Water/Moisture Water/Moisture ControlControl
• VentilationVentilation
• BreathabilityBreathability
Drained/Back-Ventilated Rain Drained/Back-Ventilated Rain Screen Screen
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RAIN SCREENRAIN SCREEN
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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
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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
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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.
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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
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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
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Improper InstallationImproper Installation
Insufficient Insufficient Ventilation = Ventilation = OxidationOxidation
Insufficient Insufficient Ventilation = Ventilation = Corrosion, dry rot, Corrosion, dry rot, mold, mildewmold, mildew
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HPL Rainscreen Installation HPL Rainscreen Installation MethodsMethods
Exposed Fastener SystemsExposed Fastener Systems Concealed Fastener SystemsConcealed Fastener Systems
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FacadesFacades
Construction Details
Horizontal Sections
Alu-Substructure Riveted
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Minimum of 1” Minimum of 1” between laminate between laminate panel and substratepanel and substrate
Ventilation CavityVentilation Cavity
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BaseBase
• Required clearance of 2-4” above ground level to insure adequate air intake.
• Base capped with a ventilation profile
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ParapetParapet
•Top must have a minimum of ¼” clearance between the parapet and panel for proper ventilation
•Air flow is from bottom to top
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Vertical Panel JointVertical Panel Joint
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Visible Mechanical FasteningsVisible Mechanical Fastenings
Exposed Exposed FasteningFasteningRivets or ScrewsRivets or Screws
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Fastening With RivetsFastening With Rivets
•Color coated rivets on an aluminum extruded carrier rail. •Finished product with open expansion joints
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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
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Aluminum Substructure
Weather Barrier
Insulation
HPL Panels with rivets on Aluminum HPL Panels with rivets on Aluminum SubstructureSubstructure
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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
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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
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Concealed Fastener System DetailsConcealed Fastener System Details