Transcript of "Radiant ventilated roofing presentation 15 02.1"
Radiant-ASV Ventilated Cool Roof Batten System Presented by Pete Bussell Founder of Cool Roof Investments (CRI) & Inventor of COOL ROOF BATTEN System
US Dept. of Energy (DOE) Roof Design Goals <ul><li>The DOE Building Technologies (BT) Program has targeted the strategic goal of developing the next generation of </li></ul><ul><li>building envelope systems, with the ultimate objective of reducing the space conditioning requirements attributable </li></ul><ul><li>to attics by 50% compared to Building America (BA) regional baseline new construction. </li></ul><ul><li>During 2005/06 computer modeling and dynamic lab and field experiments lead to a new paradigm for designing thermally active building envelopes. To meet BT’s goal, Oak Ridge National Lab’s Building Envelope Program (BEP) worked with several industries, universities, and collaborated with a sister national laboratory to merge key technologies into prototype components for building envelopes. </li></ul><ul><li>Since residential attics are subjected to greater temperature extremes than any other component of the building </li></ul><ul><li>envelope, the first field experiments were conducted on new and unique attic material configurations containing, </li></ul><ul><li>reflective insulations, cool-roof surfaces, and air channels. </li></ul><ul><li>Increasing the thermal capacitance of the attic can reduce diurnal temperature swings, and, in turn, reduce both the total energy use and peak demand in moderate and some cooling-dominant climates. </li></ul><ul><li>One of the first experimental modules tested during 2006/07 eliminated almost 90% of conventional attic heat gains and losses crossing the roof deck. Infrared reflective roof products, above-sheathing ventilation, thermal mass capacitance and radiant barriers were field tested to quantify attic performance . </li></ul>
What is Radiant–ASV Ventilation? <ul><li>The COOL ROOF BATTEN invention facilitates the rapid and cost effective construction of a thermally efficient RASV system ( Radiant Above Sheathing Ventilation System) within steep slope sub-tile assemblies, using readily available construction materials like wood or metal roof battens, flexible and rigid radiant barriers , and/or flexible or rigid radiant insulation barriers . </li></ul><ul><li>The invention facilitates the integration of 3 proven technologies known to create thermal resistance and reduce heat conduction within steep slope roof deck assemblies, namely; </li></ul><ul><li>* Sub-Tile Ventilation using battens and counter battens to form an air convection channel within a roof system. </li></ul><ul><li> * Radiant Barriers installed in compliance with minimum prescribed air space requirements to reflect radiant energy. </li></ul><ul><li>* Thermally Sealed Air Space in a Roof Sub-Assembly that effectively increases R-values by eliminating the thermal bridging associated with movement of ambient air across a roof deck assembly. The effective R-value of air space is at a maximum with no air circulation. </li></ul>
The Prevailing Market Definition of “Cool Roof” <ul><li>Most of the roofs in the world including over 90% of the roofs in the United States are dark-colored. In the heat of the full sun, the surface of a black roof can increase in temperature as much as 50 °C (90 °F), and boost attic temperatures to 66 to 88 °C (150-190 °F). </li></ul><ul><li>Negative Effects Caused by Radiant heat include; </li></ul><ul><li>Reduced Life Expectancy of Organic Roofing Materials </li></ul><ul><li>Negative Impacts on Landfill and Resources </li></ul><ul><li>Increased Energy Bills & Peak Power Demand </li></ul><ul><li>Urban air pollution - URBAN HEAT ISLAND EFFECT </li></ul>A roofing system that delivers high solar reflectance (the ability to reflect the visible, infrared and ultraviolet wavelengths of the sun & which reduces heat transfer to the building) plus high thermal emittance (the ability to radiate absorbed, or non-reflected solar energy) is defined as a cool roof . The albedo of an object is a measure of how strongly it reflects light from light sources such as the Sun
Why Solar Reflectance (‘Albedo’) of Light Colored Roofing Reduces Roof Surface Temperatures? The albedo of an object is a measure of how strongly it reflects light from light sources such as the Sun . Albedos of typical materials in visible light range from up to 0.9 for fresh snow, to about 0.04 for charcoal, one of the darkest substances. Albedo is measured between 0-1 0.80–0.90 Fresh snow 0.5–0.7 Ocean Ice 0.55 New concrete 0.40 Desert sand 0.25 Green grass 0.17 Bare soil 0.15 to 0.18 Decidious Trees 0.08, 0.09 to 0.15 Conifer forest (Summer) 0.12 Worn asphalt 0.04 Fresh asphalt Typical Albedo Sample Surfaces
‘ Cool Roofing’ or ‘ ASV Roofing’? <ul><li>ASV - is an acronym for Above Sheathing Ventilation. </li></ul><ul><li>Numerous industry studies have proven that ASV vented roofing can dramatically reduce attic temperatures even when dark colored roofing materials are used. </li></ul><ul><li>Above Sheathing Ventilation is typically created by a ‘Batten’ or ‘Batten-Less’ sub-tile airspace formed between roofing tiles and metal roofing panels. </li></ul><ul><li>This airspace is an approved alternative to California’s Title-24 Energy Code that requires a 20% reflective roof covering. </li></ul><ul><li>Installing an air-space across a roof deck meets California’s ‘2008 BUILDING ENERGY Efficiency Standards for Residential and Non-Residential Buildings’, Effective Jan-1, 2010. </li></ul><ul><li>The code allows exceptions to installing the required 20% reflective roof covering by installing a roof that provides either insulation with a thermal resistance of at least 0.85hrft 2-F/Btu (R-0.85), or a least a ¾” inch air-space is added to the roof deck over an attic. </li></ul>The Evolution of ‘COOL ROOF’ Definition
Basic Principles of Attic Ventilation Images Courtesy of Airvent.com Optimal attic ventilation is achieved when: 1. cool fresh air is drawn in to the attic via soffits at the eaves of the roof 2. cooling the attic by means of balanced soffit and ridge ventilation with a minimum of 1 square foot of net free ventilating area for every 150 square feet of attic space measured at the attic floor level. 3. and vented from the attic at the ridge from a baffled ridge vent Image Courtesy of Penfolds Roofing.com <ul><li>Proper Attic Ventilation is fundamental to Cool Roof Design. The 2 key principles of Attic ventilation are; </li></ul><ul><li>STACK EFFECT </li></ul><ul><li>WIND PRESSURE </li></ul>
Basic Principles of ASV Ventilation A Common Application for Above Sheathing Ventilation ( ASV) is the ventilation used for Cathedral Ceilings and Livable Attic Space. ASV creates a sub-tile ventilation channel which functions as a thermal bridge to reduce radiant heat transfer into the building envelope Attic Ventilation used in conjunction with ASV ventilation significantly enhances the Thermal Efficiency of a Roof System. Images courtesy of cornell corporation.com
Basic Principles of Radiant Barriers <ul><li>NASA’s Apollo Space program used reflective foil to create the radiant barriers used for their spacecraft and spacesuits. </li></ul><ul><li>The foil shielded the astronauts from the sun by day and reflected internal heat back inside their space shuttle at night. </li></ul><ul><li>Radiant barriers function like a Thermos Flask which uses its reflective coating and adjacent sealed air space to keep beverages hot or cold. </li></ul><ul><li>The design principles supporting Radiant-ASV Ventilated Roofing are similar…… </li></ul>
The Relevance of Radiant Barriers in Cool Roof System Design. <ul><li>Radiant foil installed over or under standard roof deck sheathing shields the roof attic from radiant heat by day and reflects internal heat back inside the building at night. </li></ul><ul><li>A radiant barrier consisting of at least one low-emittance surface applied adjacent to an enclosed air space, reduces the movement of radiant energy across the enclosed air space and reduces radiation from warm surfaces. </li></ul><ul><li>A radiant barrier’s low emittance and high reflectance will block between 90–97% of the radiant heat that strikes a roof surface by day, & significantly reduce the total heat transfer in and out of the roof attic assembly. </li></ul><ul><li>Radiant barriers must be installed with their reflective, (low emittance), surface facing an open air space. If this reflective surface is in contact with another surface, it becomes a direct conductor of heat. </li></ul>
Radiant Barriers - Recognized Methods of Installation Radiant barrier material is attached directly to the underside of the roof deck. Slide Courtesy of www.ornl.gov Radiant barrier is draped over the rafters or trusses in a way that allows the product to droop 1-1/2 to 3 inches between each rafter adding rafter ventilation NEW ROOF RETROFIT Radiant barrier is attached to either the faces or bottoms of the rafters or top chords of the roof trusses. Radiant barrier is laid out on the attic floor over the top of existing attic insulation and susceptible to dust accumulation.
The Importance of Air Space When Installing Air Barriers Slides Courtesy of www.radiantguard.com
Radiant Barriers = Cost Effective Energy Savings <ul><li>Radiant sheathing is commonly used in new home construction in California. </li></ul><ul><li>Sheathing, made of regular OSB or plywood panels with a layer of radiant barrier foil laminated to one side, blocks about 97 percent of the sun's radiant heat, and reduces attic temperatures by around 30 degrees according to manufacturer claims. </li></ul><ul><li>California’s Title 24 mandatory building efficiency standards are one of the biggest factors driving the growth of radiant barriers. </li></ul><ul><li>Radiant barrier panels help builders gain a $2,000 federal tax credit if they achieve 50 percent energy savings for heating and cooling over the 2004 International Energy Conservation Code (IECC). </li></ul><ul><li>Installing radiant barriers is one of the the least expensive ways to secure energy savings </li></ul>
Basic Principles of ‘Radiant-ASV’ Ventilation When you install either Radiant Barriers or Radiant Insulation adjacent to an airspace within a ASV (Above Sheathing Ventilation) system, … the s ynergistic benefits of ASV are harnessed with the energy saving attributes of Radiant Barriers . This combined application of both systems in an ASV roof assembly is referred to as ‘Radiant-ASV’
ORNL’s Radical New ‘R-ASV’ Roof Design Design Improvements Made in the Second Generation ORNL Roof Assembly (2007) During the week of July 16th 2007, a second generation PCM test roof assembly was constructed. The new roof assembly featured an improved above-sheathing ventilation system which included two separate air channels to remove heat from the PCM storage. Summertime heat transfer penetrating the roof deck of a comparison asphalt shingle roof reached a peak of about 23 Btu per hr per square foot of roof deck . The conventional asphalt shingle roof had a radiant barrier attached to the underside of the sheathing (facing into attic) and was used for comparison of how effective a radiant barrier facing into the attic would be as compared to a conventional shingle roof- and the roof with above-sheathing ventilation. By comparison, the second generation ORNL PCM roof dropped the heat flux to less than 5 Btu per hr per square foot of roof deck in field testing at ORNL where outdoor temperatures exceeded 95°F.
Cool Roof Batten–Principles of Design <ul><li>The Cool Roof Batten Assembly optimally harnesses the energy saving benefits of Sub-Tile Ventilation , Radiant Barriers and Passive Sealed Air Space within a Roof Deck Sub- Assembly, thereby increasing the thermal efficiency of a roof system based on its custom design. </li></ul><ul><li>The Cool Roof Batten assembly facilitates the suspension of either Radiant Barrier Membranes or Radiant Insulation above the roof deck assembly, and provides the added advantage of concealing and elevating all mechanical attachment points above the roof deck directly between the upper and lower batten riser assemblies- resulting in NO weather exposed perforations of either the radiant barrier membranes or radiant insulation This patent pending feature of the cool roof batten assembly can dramatically improve the long term vapor resistance and integrity of the roof deck assembly. </li></ul><ul><li>The unique design of the COOL ROOF BATTEN facilitates quick and easy onsite assembly of a partitioned Thermally Sealed Lower Air Barrier Layer and an Upper Radiant Ventilation Layer within a Radiant ASV Roof Assembly. </li></ul>
Cool Roof Batten – Technology Integration <ul><li>Integrating radiant foil barriers within an ASV Roof Assembly or Attic Assembly eliminates up to 97% of the radiant energy entering a building envelope, and saves 7-10% on annual cooling costs according to the Florida State Energy Center (University of Florida) </li></ul><ul><li>Sub-tile venting lowers the heat content of attics and interior surface temperatures, which in turn lowers the amounts of heat penetrating attic floors. </li></ul><ul><li>Sub-tile venting can reduce up to 70% the radiant heat flow across a roof deck assembly. It also results in a directly corresponding decrease in attic venting as a result. This decrease in attic venting is beneficial in reducing winter heat loss, as passive ventilation reduces winter loss associated with heat flux escaping from the building envelope. </li></ul>
1. The Vertical Batten Spacer <ul><li>The vertical batten spacer , facilitates the accurate positioning, layout and installation of the vertical cool roof batten riser and mounting assemblies as well as the lower drip channel assemblies on a roof deck structure, in accordance with local building codes and manufacturer prescribed vertical batten spacing specifications. </li></ul>The upper batten riser and mounting assembly in conjunction with the vertical batten spacer provides a highly accurate roof jigging template that facilitates the rapid accurate installation of roofing systems requiring battens to be mounted to the roof deck or truss assembly – this without any need to use chalk lines and batten gauges
2. The Upper Riser & Mounting Assembly <ul><li>The Upper Batten Riser and Mounting Assembly is a nesting assembly with flanged batten wells for accurately positioning battens to specific manufacturer batten spacing requirements. Pre-spaced nesting batten wells in the riser assembly can support either Wood Battens or Snap- In Metal Battens. </li></ul><ul><li>The Upper Riser and Mounting Assembly is manufactured in 3 variable height options for accurately elevating and mounting horizontal roof battens or roof sheathing to an optimal height above a roof deck assembly. This patent pending feature facilitates optimized ventilation based on roof slope, length and pitch factors. </li></ul><ul><li>The Upper Riser and Mounting Assembly can be used on its own or in conjunction with the Lower Drip Channel Assembly </li></ul>Roof Pitch and Roof Slope Length have a direct correlation to the Convection and Ventilation rates within a roof assembly. Adjusting the height of the batten riser assembly influences the thermal insulation characteristics of the roof which varies from roof to roof based on roof pitch, slope & design.
Features of Upper Riser & Mounting Assembly The Upper Batten Riser and Mounting Assembly can be installed directly to the roof deck , or applied to a Batten, Truss or Rafter. The assembly provides unrestricted drainage & ventilation of the roof deck assembly. When applied directly to trusses or rafters, the Upper Batten Riser and Mounting Assembly can optionally support flexible radiant membranes in suspension between adjacent riser assemblies mounted on rafters. This configuration forms our patent pending radiant rafter ventilation channel with variable height and ventilation flow rate options. The adjacent upper batten riser and mounting assemblies and trusses or rafters form the peripheral walls of the sub-tile ventilation channels.
Features of Upper Riser & Mount <ul><li>The Upper Batten Riser & Mount is a Stand alone Upper Batten Riser member with a flanged batten well for mounting Roof Battens at roof edges and peripheries. </li></ul><ul><li>The Upper Batten Riser & Mount enables battens to be mounted vertically or horizontally to a roof deck , rafter or truss . It additionally nests directly on the Upper Riser & Mounting Assembly to facilitate short batten courses, cheater courses and starter courses. </li></ul><ul><li>Batten wells in the Upper Batten Riser & Mount support either Wood Battens or Snap- In Metal Battens. </li></ul>
3. The Lower Drip Channel Assembly The Lower Drip Channel Assembly is an optional base support assembly for the Upper Batten Riser Assembly . Using the upper and lower mounting assemblies in conjunction with each other, facilitates the installation of suspended radiant vapor barriers and rigid radiant insulation with patent pending ‘low perforation’ barrier attachment technology . Typically hundreds of perforations are required for mechanical attachment of traditional vapor and radiant barrier membranes to a roof deck system. Mechanical attachment points are elevated above the roof deck & sandwiched between the upper and lower batten riser assemblies – resulting in limited perforation of the radiant vapor barrier and roof deck, dramatically improving the long term vapor resistance of the roof deck assembly. This unique functionality facilitates the formation of a partitioned Thermally Sealed Lower Air Barrier Layer and an Upper Radiant Ventilation Layer within an ASV assembly.
Applications for Lower Drip Channel Assembly Flexible Radiant ASV System Rigid Radiant ASV System
Benefits of the Cool Roof Batten System <ul><li>Zero Defect Installations + Installation Waste Reduction </li></ul><ul><li>Rapid Accurate Layout of Roof Sub-Assembly without Batten Gauges and Chalk Lines </li></ul><ul><li>Optional ‘Radiant- ASV’ Barrier Integration </li></ul><ul><li>Optional ‘Radiant- ASV’ Insulation Integration </li></ul><ul><li>25% Reduction in Batten Installation Time & Labor Costs </li></ul><ul><li>Potential Energy Savings ranging from 20-35 % compared to traditional Asphalt Shingle Roofs </li></ul><ul><li>LEED credits for Thermal Energy Efficiency and Design </li></ul>
Cool Roof Batten- Market Opportunities <ul><li>Promote the Unique Synergistic Benefits of an Exclusive Batten Technology & Sell More Roofing Products </li></ul><ul><li>Leverage and Integrate the Proven Energy Benefits of an exclusive COOL ROOF BATTEN System & Sell More Roofing Products </li></ul><ul><li>Secure Market Channel Exclusivity for Patent Pending LEEDS Compliant Product & Sell More Roofing Products </li></ul><ul><li>Offer Installers a Rapid Accurate System for Layout of a Roof Sub-Assembly without Batten Gauges and Chalk Lines & Sell More Roofing Products </li></ul><ul><li>Offer Installers a 25% Reduction in Batten Installation Time & Associated Labor Costs & Sell More Roofing Products </li></ul><ul><li>Offer Homeowners and Commercial Property Managers Optional ‘Radiant- ASV’ Barrier Integration & Sell More Roofing Products </li></ul><ul><li>Offer Homeowners and Commercial Property Managers Optional ‘Radiant- ASV’ Insulation Integration & Sell More Roofing Products </li></ul><ul><li>Offer Homeowners and Commercial Property Managers Potential Energy Savings ranging from 20-35 % compared to traditional Asphalt Shingle Roofs & Sell More Roofing Products </li></ul>
Cool Roof Batten - Marketing Support <ul><li>Each Cool Roof Batten Licensing Agreement includes Marketing Consulting & Support of AURAL MARKETING and the Canadian Technology Business Development Center ( IRAP) </li></ul><ul><li>Aural Marketing Specializes in Web Based Marketing to the Roofing Industry and owns over 30 Cool Roof DOMAINS and TRADE MARKS that will be used to exclusively support the marketing efforts of Cool Roof Batten Licensees. </li></ul><ul><li>Domains Owned and Managed by Aural Marketing include: </li></ul><ul><li>Cool Roof Batten.Com Cool Roof Shake.Com Cool Roof Tile.Com Cool Roof Shingle .Com Cool Roof USA.Com Cool Roof Canada.Com Cool Roof World .Com Cool Roof Alliance.Com </li></ul>
Take the Next Step <ul><li>Manufacturers Potentially Interested in Negotiating either Licensing or Exclusive Territorial Distribution Agreements are Requested to do so in writing </li></ul><ul><li>Address Inquiries to: </li></ul><ul><li>Peter Bussell – President Aural Marketing </li></ul><ul><li>Email : [email_address] </li></ul><ul><li>Cell : 613-978-8644 Office : 613-736-7654 x111 </li></ul><ul><li> </li></ul>