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

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Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Drained/Back-Ventilated Rain Screen System Slide 2 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com OBJECTIVES What is Drained/Back Ventilated rainscreen? What is Drained/Back Ventilated rainscreen? Components of Exterior HPL panels. Components of Exterior HPL panels. Rainscreen details and installation methods. Rainscreen details and installation methods. Slide 3 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com The Rain Screen Principle Water/Moisture Control Water/Moisture Control Ventilation Ventilation Breathability Breathability Drained/Back-Ventilated Rain Screen Slide 4 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com RAIN SCREEN Slide 5 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com When it rains. Panels deflect most of the rain water Panels deflect most of the rain water Only 15% of the rain enters the cavity & exits at the perforated vent at grade Only 15% of the rain enters the cavity & exits at the perforated vent at grade Less than.5% reaches the weather barrier Less than.5% reaches the weather barrier Moving air through the cavity helps remove condensation Moving air through the cavity helps remove condensation Gap Size between Panels is 5/16 or 8mm Gap Size between Panels is 5/16 or 8mm Slide 6 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com D/B-V Rainscreen Based on 2 separate leafs (Outer and Inner) Outer = First line of defense, Water Control Outer = First line of defense, Water Control Inner = Secondary line of defense moisture barrier, Vapor/Air Barrier, insulation, structural Inner = Secondary line of defense moisture barrier, Vapor/Air Barrier, insulation, structural Slide 7 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Ventilation & Breathe-ability Open joints and openings at top & bottom of faade. Open joints and openings at top & bottom of faade. Constant air flow dries up any moisture/rainfall left inside the cavity Constant air flow dries up any moisture/rainfall left inside the cavity Ventilation cavity allows hot air to flow upward and out of cavity without penetrating or migrating through wall. Ventilation cavity allows hot air to flow upward and out of cavity without penetrating or migrating through wall. Slide 8 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Solar Protection - Air moving through the cavity prevents heat accumulation cooling the inner layers of the wall assembly Solar Protection - Air moving through the cavity prevents heat accumulation cooling the inner layers of the wall assembly Reduces the demand for cooling energy. Reduces the demand for cooling energy. When cold - Air flow in cavity is heated by building thus causing any condensation or any penetrating rain to dry. When cold - Air flow in cavity is heated by building thus causing any condensation or any penetrating rain to dry. When the sun shines.. or when its cold Slide 9 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Components of VRS Panel Panel Vertical Support Members Vertical Support Members Compartment-ized air cavity Compartment-ized air cavity Breathable Weather Barrier Breathable Weather Barrier D/B-V Rain Screen System Details Slide 10 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Improper Installation Insufficient Ventilation = Oxidation Insufficient Ventilation = Corrosion, dry rot, mold, mildew Slide 11 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com HPL Rainscreen Installation Methods Exposed Fastener Systems Exposed Fastener Systems Concealed Fastener Systems Concealed Fastener Systems Slide 12 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Facades Construction Details Horizontal Sections Alu-Substructure Riveted Slide 13 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Minimum of 1 between laminate panel and substrate Ventilation Cavity Slide 14 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Base Required clearance of 2-4 above ground level to insure adequate air intake. Base capped with a ventilation profile Slide 15 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Parapet Top must have a minimum of clearance between the parapet and panel for proper ventilation Air flow is from bottom to top Slide 16 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Vertical Panel Joint Slide 17 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Visible Mechanical Fastenings Exposed Fastening Rivets or Screws Slide 18 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Fastening With Rivets Color coated rivets on an aluminum extruded carrier rail. Finished product with open expansion joints Slide 19 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com HPL Panels with screws on Wood Substructure Rear Ventilation Rain Screen Weather / Air Barrier Substructure Option insulation Airspace Between #1 or 3 or 1 Weather Barrier Insulation Framing Slide 20 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Aluminum Substructure Weather Barrier Insulation HPL Panels with rivets on Aluminum Substructure Slide 21 Copyright 2010-2011, Facade Works Inc - www.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. Installation Slide 22 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Concealed Fastener Systems Allows for clean, aesthetic design Allows for clean, aesthetic design Clips attach to back of panel with rivets, then mount on rail system Clips attach to back of panel with rivets, then mount on rail system More labor intensive installation More labor intensive installation Slide 23 Copyright 2010-2011, Facade Works Inc - www.facadeworksinc.com Concealed Fastener System Details