I N S U L A T I O N
I S S U E
Solve Your Acoustics Problem With
One Word Turn to page 13 for more info
September 2011 | Volume 74, Issue 9 | The Voice of the Industry Since 1938™ | www.wconline.com
New York Insulated Upper West Side Story | Bob Drury Retires
WC08114CERTCEIL.indd 1
7/21/11 3:13 PM
INTRODUCING THE TOUGHEST SOUND DAMPING BOARD AVAILABLE. Knock out noise with a gypsum board that’s abuseresistant, mold-resistant and UL Classified Type X for fire-rated assemblies. Choose SoundBreak®XP® and you’ll see it can really take the hits.
1/2” version now available for residential applications.
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The GREENGUARD Children & Schools Mark is a registered certification mark used under license through the GREENGUARD Environmental Institute.
The contractor’s new choice.
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Simpson Strong-Tie introduces slide-clip and fixed-clip connectors for cold-formed steel curtain-wall construction. Our new line of connectors for steel-stud framing is designed and field tested with the installer in mind. From field support and training to national product availability, we are here to make sure installation is as simple and quick as possible. As with all Simpson Strong-Tie ® products, our new connectors for steel-stud framing carry our promise of quality and performance, and are backed by prompt, technical support. Learn more by visiting www.strongtie.com/cfsclips or by calling (800) 999-5099.
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©2011 Simpson
Strong-Tie Company Inc. CFSCWC11-C
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VO L U M E 7 4 N U M B E R 9
columns 06
Up Front by Mark Fowler
50
Finish Line by Robert Thomas
52
Straight Green
Trade News
14
Product Focus
57
Classified Marketplace
58
Advertiser Directory
New York Insulated
22 Jolly Green and Giant/ICF-SIP Special Section University of Ontario residence hall on track to being one of the biggest LEED buildings in the Great White North.
26 Everything Old is New Again Dry, dense-pack cellulose is used to insulate a grand old home in a very new way.
34 Moisture Management of Below-Grade Construction Basements
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September 2011 | Volume 74, Issue 9 | The Voice of the Industry Since 1938™ | www.wconline.com
Hybrid insulation systems provide cost-effective mix of excellent air, thermal and moisture-control performance.
Spray polyurethane foam is a viable alternative when conducting weatherization projects.
departments
I S S U E
16 Insulation Systems Engineered Right
30 Fitting Foam into Weatherization Retrofits
by Chris Dixon
I N S U L A T I O N
features
september
on the cover o D Dense-pack cellulose insulation was used in in tthis 4,000 square foot hhome in Southampton, LLong Island, N.Y.
Upper West Side Story | Bob Drury Retires
Keeping foundations dry is crucial to any building’s long life. Better waterproofing isn’t enough to do the job, sound construction practices are needed to keep water out and a structure sound for years to come.
42 Time of His Life Bob Drury discusses his almost 40-year career as executive director for the NWCB.
46 Forward, Into the Past A New York contractor uses fine detail plaster work and an artist’s approach to paint to restore an apartment building on Manhattan’s Upper West Side.
54 New Product Buzz Guide
The official publication of CLAPCA, FWCCA, and NWCB.
ON THE WEB www.wconline.com
FWCCA—July 18-22 Renaissance St. Augustine. St. Augustine, Fla. NWCB—May 10-12 The Fairmont Scottsdale Princess, Scottsdale, Ariz.
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| Walls & Ceilings | September 2011
Breaking News W&C Blogs Web-only Features Special Sections W&C Architect
W&C Digital Edition Media Kit Facebook White Papers/ Case Studies
Readers can download the mobile app to snap the mobile tag at http://gettag.mobi
Easy, accurate ceiling transitions Our new transition molding is a simple solution to making clean transitions from a suspended ceiling – including mineral fiber, wood, and metal – to a drywall surround. It’s compatible with all Armstrong Suspension Systems and Drywall Grid Systems. And the hot dipped galvanized transition molding eliminates the need for a vertical drywall return at the transition, return framing to support drywall return, and corner bead and vertical taping. 1" INVERTED T MOLDING Allows a monolithic horizontal transition that works with Armstrong Suspension Systems. Pre-painted white integral eed for g.
INSTALLATION
SYSTEMS Between us, ideas become reality™
FA S T E R . E A S I E R . B E T T E R . armstrong.com/transitions9wc
1 877 ARMSTRONG
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TRANSITION MOLDING WITH SHADOW REVEAL The easy-to-cut molding installs with all types of framing, including Armstrong Drywall Grid and ShortSpan™. Available with a 9/16" or 15/16" acoustical flange; 15/16" flange is compatible with our Seismic Rx® solutions.
up
FRONT BY MARK FOWLER
Too Good to be
True? Several months ago, I wrote a column entitled “Stupid Prices.” The theme of the column was the inevitable price dropping in recessionary times, sometimes to ridiculous levels. The bid prices can be so low, it is simply “stupid” low. This becomes most apparent on public works projects where a prevailing wage rate is set and mandated by law. How can bidders bid so low on a project where the government has mandated a wage? Contractors know the established wage that must be paid, and materials are not that difficult to calculate for a project, so prices should be all in the same ballpark. Superior supervision and lower overhead can save money in the bid process, but some of these bids are so low that the bidder is either completely unqualified or must be planning to cheat to bring the project in at this extreme low number.
EVERYBODY KNOWS IT I got a resounding thumbs-up from the subcontracting community on the column and even several requests the editorial be re-printed in other trade publications. I had a subcontractor call me to share a story about a client who was typically loyal, but was entertaining a ridiculously low bid. The general contractor called his subcontractor and informed him he felt compelled to use this low bid, “I just can’t pass it up” he told his subcontractor. The subcontractor gave the general contractor the “Stupid Prices” column to read and asked him consider all the ramifications of using this super-low bid.
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| Walls & Ceilings | September 2011
Consider he did, and after a few days he called his loyal subcontractor and decided to throw out the stupid low bid and stay with his qualified subcontractor. That phone call marked a good day for me, for him and his customer—he just may never know just how good. The disasters that are typically left in the wake of these stupid prices are unpaid bills, construction defects and a mountain of unpaid debt and paper work to fix the mistakes. General contractors, building owners and even suppliers may believe they are not affected by the stupid price, but we all pay for it in the long run. I recently read a news story that illustrated the full ramifications of a stupid low bid and the parties who pretend they do not know or “can’t pass it up” and now probably wish they did.
YOU’LL PAY EVENTUALLY A framing contractor in California has been ordered to pay $1.3 million and fined $200,000 stemming from a scheme to systematically and willfully fail to pay his employees the mandated state set prevailing wage. The University of California Davis housing project was investigated by the Department of Industrial Relations and California Labor Commissioner Angela Bradstreet believed the framing contractor intentionally
underpaid its workers. The rest of u the t story (and this should be a wakeup u call to people who knowingly accept super low bids) is that addia tional fine assessments were made t on o the general contractor and the material supplier. m I suspect the qualified subcontractors who bid the project using t the t correct rate with no intention of cheating knew the awarded contracc tors bid was a stupid price. What t may be a surprise to many people is that additional parties are now being fined.
EVERYONE PAYS What the story failed to address is the money the state must be spending to investigate and prosecute these cheaters. Who pays those state investigators? We do, the taxpayers. While the state may claim the assessed fines will offset much of the investigating costs, the likelihood of the framing contractor paying the fines is pretty low. He is more likely to appeal the charges, drag it out for years, run up more tax payer expense and then ultimately either settle for pennies on the dollar or file bankruptcy. We all pay for that stupid low bid in the long run. Is it any wonder why state budgets are bankrupt? I don’t blame the state. The labor department is doing their job to the best of their ability. What about checking the bids and verify the low bidder is qualified and is submitting a reasonable bid? The lowest bidder may have looked like the best deal at first, but what about at the end of the day? Someone needs to inform these owners that future construction defects may appear. Underpaid workers forced to work overtime are far more likely not to be well trained, fail to understand code compliance or simply skip important life/safety steps in construction. The end result could be that we taxpayers may be paying for that stupid price for decades to come. W&C
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Bob Drury — Executive Director, NWCB Michael Kwart — Executive Director, ICAA Michael Gardner — Executive Director, Gypsum Association Steve Pedracine — Executive Director, Minnesota Lath & Plaster Bureau Jon Mooney — President, Acoustics by J.W. Mooney Elizabeth Steiner — Executive Director, ICFA
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[email protected] WALLS & CEILINGS (ISSN 0043-0161) is published 12 times annually, monthly, by BNP Media II, L.L.C., 2401 W. Big Beaver Rd., Suite 700, Troy, MI 48084-3333. Telephone: (248) 362-3700, Fax: (248) 362-0317. No charge for subscriptions to qualified individuals. Annual rate for subscriptions to nonqualified individuals in the U.S.A.: $115.00 USD. Annual rate for subscriptions to nonqualified individuals in Canada: $149.00 USD (includes GST & postage); all other countries: $165.00 (int’l mail) payable in U.S. funds. Printed in the U.S.A. Copyright 2011, by BNP Media II, L.L.C. All rights reserved. The contents of this publication may not be reproduced in whole or in part without the consent of the publisher. The publisher is not responsible for product claims and representations. Periodicals Postage Paid at Troy, MI and at additional mailing offices. POSTMASTER: Send address changes to: WALLS & CEILINGS, P.O. Box 2147, Skokie, IL 60076. Canada Post: Publications Mail Agreement #40612608. GST account: 131263923. Send returns (Canada) to Pitney Bowes, P.O. Box 25542, London, ON, N6C 6B2. Change of address: Send old address label along with new address to WALLS & CEILINGS, P.O. Box 2147, Skokie, IL 60076. For single copies or back issues: contact Ann Kalb at (248) 244-6499 or
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© 2010 CertainTeed Corporation
TM
The only gypsum board that clears the air. Doesn’t that feel better? Indoor air contains many pollutants and VOLATILEORGANICCOMPOUNDS6/# S 4HE6/# SAREFOUNDINFURNITURE CARPETS cleaning materials, and many other everyday items. With the growing awareness of the importance of indoor air quality, particularly in hospitals, schools, offices and residences, it’s time to clear the air.
AirRenew™ is the only gypsum board that actively improves air quality. s0ERMANENTLYREMOVES6/# S by converting them into safe, inert compounds. s!BSORBS6/# SFORUPTOYEARS even after multiple renovations, based on tests and analysis. s2ECYCLABLEANDWORKSWITHMOST paint and wallpaper. s0ROVIDESENHANCEDMOISTURE and mold resistance using M2Tech® technology.
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TRADENEWS CALENDAR SEPTEMBER 13-16 CONSTRUCT/TFM 2011 McCormick Place Chicago www.constructshow.com 22-24 ICAA ANNUAL CONVENTION & TRADE SHOW Contemporary Resort Orlando, Fla. www.insulate.org
OCTOBER 4-7 GREENBUILD 2011 Metro Toronto Convention Centre Toronto, Canada www.greenbuildexpo.org 11-13 METALCON Georgia World Congress Center Atlanta www.metalcon.com 12-15 THE REMODELING SHOW Lakeside Center McCormick Place Chicago www.remodelingshow.com
NOVEMBER
ARMSTRONG USGBC-APPROVED COURSE AVAILABLE ONLINE
RED AND NATIONAL GYPSUM PARTNER FOR HEAT AND POWER PROJECT
Armstrong Ceiling & Wall Systems’ “Sustainable Ceiling Systems” is a new USGBC-approved course available online. To access “Sustainable Ceiling Systems,” visit www.usgbc. org/coursecatalog. The new addition to the USGBC catalog of courses not only addresses the contribution of acoustical ceiling systems to energy performance, indoor environmental quality, and occupant productivity but also the application of those concepts on projects. Participants will also learn how to evaluate green interior finishing products to assist their clients in their environmental efforts, and how ceiling systems can contribute to as many as 13 LEED credits. At the conclusion of the course, participants will be able to specify and apply different types of ceiling systems to maximize their impact on building design, energy efficiency and sustainability. Completion of the course qualifies for one continuing education hour toward the Green Building Certification Institute’s Credential Maintenance Program. The course is also approved as a continuing education unit by the American Institute of Architects and Interior Design Continuing Education Council.
Recycled Energy Development and National Gypsum have joined for a combined heat and power project at the manufacturer’s Burlington, N.J. facility. Supported by the State of New Jersey, the project will produce approximately 3.4 megawatts of clean electricity and deliver more than 210,000 MM Btu of thermal energy, resulting in an overall efficiency of greater than 90 percent. RED’s combined heat and power system will provide clean power and thermal energy to National’s wallboard production facility. The transformational CHP project will reduce the company’s energy intensity and greenhouse gas emissions and serve as a model for energy efficiency and emission reductions at energy intensive industrial facilities throughout the United States. RED received a $1.36 million grant from the state to support the CHP project. Funding was made available through the Clean Energy Solutions ARRA CHP Program, a grant program supported by the American Recovery and Reinvestment Act of 2009 and jointly developed by the New Jersey Economic Development Authority and the New Jersey Board of Public Utilities.
6-9 AWCI ANZ 66TH ANNUAL CONFERENCE Reef View Hotel Hamilton Island Queensland, Australia www.awci.org.au 13-15 STADFA Henry B. Gonzalez Convention Center, San Antonio www.stafda.org For additions or corrections to our Calendar, please call (248) 244-6404.
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| Walls & Ceilings | September 2011
PEOPLE BASF Wall Systems Southeast District Sales Manager, Jim Doyle, has been elected the new president of the Florida Wall & Ceiling Contractors Association by its Board of Directors. GZA GeoEnvironmental Inc. has named Amy Doherty senior project manager at the company’s Manchester, N.H., office. ITW Muller expands its sales team with the appointment of Rob Payne to industry manager.
Doherty
Johns Manville announced that Fred Stephan has assumed the role of vice president and general manager for the company’s Insulation Systems business. Payne
U.S.A.
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TRADENEWS Grants provided through the program were to be used for CHP facility installation and upgrade projects in New Jersey. The closing of the competitive solicitation was in October 2010.
TSN RECEIVES ISO 9001: 2008 CERTIFICATION The Steel Network has announced that its manufacturing facility in Durham, N.C., has successfully completed the ISO 9001:2008 cer-
tification for its quality management system effective in July. The scope of registration includes the design, manufacture and assembly of steel members, connectors and pre-engineered systems for use in load bearing and non-load bearing cold-formed steel construction. The certificate was awarded by NSF International Strategic Registrations Ltd., an ANSI-ASQ National Accreditation Board accredited registrar.
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Please Circle #112 On Reader Action Card | Walls & Ceilings | September 2011
“The ISO 9001:2008 certification is a testament to TSN’s dedication to provide the finest products in the light steel framing industry. It is through this quality management process that TSN delivers the most innovative engineered products in the industry providing cost savings while improving the safety of structures.” said TSN CEO Edward di Girolamo, P.E. This certification is a significant event within the light gauge steel manufacturing industry, as TSN is the first manufacturer of light gauge steel studs and connectors to achieve ISO 9001:2008 certification for its quality management system.
Aegis Metal Framing has launched a redesigned its Web site www. aegismetalframing.com. The site has been reconfigured based on analytical data detailing Web user activity over the course of two years. This user activity has helped pinpoint the most relevant and frequently accessed information for engineers, contractors and architects, including: • Spec Creator: an interactive tool to assist specifying cold formed steel trusses • Green building and LEED certification • Extensive construction detail libraries • Project case studies W&C
Solve Your Acoustics Problem
With One Word Environmental Acoustics
87 hums from phones, not exactly in silent mode
+
150 squeaks as 150 students get comfortable
+
207 periodic click-clicks waiting for class to end
=
Design Smarter Environments with Adagio® Ceilings. Add up all the distracting noise in the typical college classroom. Factor in the proven harmful effects noise has on student comprehension levels. Your answer is Adagio Ceilings Systems from CertainTeed. Nobody takes environmental acoustics more seriously. Adagio has a NRC value of 0.80 and a CAC value of 42, the best in the industry. So for those spaces where being able to hear every word is essential, it’s Adagio.
You’re not just solving a design problem. You’re helping teachers teach and students learn.
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product
FOCUS
on
Software and Web Services Single-member sizing software ILEVEL Forte 2011 software is a free, single-member sizing tool for vertical and horizontal framing members, including freestanding posts, studs, columns embedded in wall systems, beams, joists and headers. The software sizes dimension lumber and engineered wood products and accounts for seismic and wind loads. If you read this article, please circle number 173.
BIM modeling CERTAINTEED GYPSUM The company has introduced BIM objects for building, design and construction professionals’ use in project design, specification and scheduling. The objects are available through Reed Construction Data’s proprietary SmartBIM Library and include details and systems on the company’s gypsum and sheathing boards. Providing Autodesk Revit users with access to manufacturerspecific systems in context makes it easier for design professionals to streamline project specification and workflow. This offering provides architects, contractors, builders and dealers with one partner to provide service and support for commercial and residential building projects.
ADVANCED ESTIMATING
The Digital Takeoff Table 2 solution integrates with the latest version of On-Screen Takeoff to generate digital construction takeoffs. The product is a hands-on digital takeoff solution that furthers the technology developed for the original Digital Takeoff Table solution (released by On Center in 2009). Designed to increase takeoff speed and accuracy, the solution includes a 21.3-inch write-on monitor, a patented cordless grip pen, 16 customizable ExpressKeys that give users access to On-Screen Takeoff-specifi c shortcuts and grip pen calibration to better simulate writing with a pencil on paper plans. The solution includes all hardware, as well as the Takeoff integration file. On-Screen Takeoff licenses are sold separately.
The EDGE estimating software application now includes USG Ceilings products. The company also issued seven new Seismic Technical Guides to help building professionals better understand and comply with seismic ceiling design requirements outlined in the International Building Code. Estimators can easily select from a library of pre-loaded USG ceilings products which make estimating and procurement more accurate and efficient. Enhanced system features further simplify the estimating process for complex takeoffs. So when an estimator selects “seismic installation,” any additional components and labor necessary to install in accordance with the code are included in the estimate automatically. Professionals can also improve their dealer communications by generating detailed quote requests or purchase orders that list exact item descriptions with carton quantities.
If you read this article, please circle number 175.
If you read this article, please circle number 176.
If you read this article, please circle number 174.
Hands-on digital takeoff solution ON CENTER SOFTWARE/WACOM
Damage and estimate costs application XACTWARE XactScope is a sleek, intuitive application that contractors and insurers can use to scope room dimensions, search line items and estimate property losses from their smart phones. Users can then send the information to their desktop version of Xactimate, the company’s estimation software, to be included with assignments or to supplement new projects. Users can download XactScope
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Seismic guides and ceiling products application
| Walls & Ceilings | September 2011
for free at the BlackBerry application store and it will be available on the iPhone and other personal devices. The product is compatible with the latest version of Xactimate 27.1 and is bundled into Xactimate Professional at no additional cost. Once the application is installed, users can register it on Xactimate so the two platforms can communicate with each other. Users can then download price lists and scope losses anytime, anywhere. If you read this article, please circle number 177.
We’re Redefining FRP
FRP Wall Panels Manufactured with 20% Post-Industrial Recycled Content
From Recycled Product Please Circle #133 On Reader Action Card
Insulation SYSTEMS ENGINEERED RIGHT O
ne of the key components of sustainable homes and buildings is a thermally efficient and dry building envelope that minimizes the leakage of air through the home. Air leaks in walls and attics decrease occupant comfort by permitting the entrance of cold or hot air, depending on the season. They can also contribute to low indoor air qualit y by allowing in dust and airborne pollutants, as well as water vapor, which can cause mold growth if trapped in wall cavities for too long. In addition, air leakage leads to higher utility bills. According to the U.S. Department of Energy, the average American household spends approx imately $1, 30 0 a year on energy used for heating and cooling and 25 to 40 percent of this energy is lost due to leakage in a typical residence. To solve the air leakage problem, many of today’s contractors are taking a systems approach to insulation, installing products in wall cavities and attics that work together to impede air flow, reduce heat loss or gain and maintain a dry building envelope. Hybrid insulation systems combine the best attributes of two or more insulation products to provide a cost-effective airtight seal around the home as well as high thermal efficiency and superior moisture control. This leads to increased occupant comfort, improved thermal performance of the building envelope over the life of the home and makes the system a key component of an Energy Star rated home. Houses and buildings with hybrid insulation systems are extremely energy-efficient, which is good for the environment and
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| Walls & Ceilings | September 2011
Hybrid insulation systems provide a cost-effective mix of excellent air, thermal and moisture-control performance. By Randy Straight reduces utility costs for the home or building owner. One good example of a high-performance hybrid insulation system combines 1 inch of closed-cell spray foam insulation, fiberglass batt or blown-in insulation and a smart vapor retarder. In this article, we’ll take a closer look at each component, what it contributes individually and show how the components together can offer even more to the building envelope.
CLOSED CELL SPRAY POLYURETHANE FOAM INSULATION Made from polyurethane, SPF insulation offers a thermal resistance of up to R 6.4 per one inch of installed thickness—one of the highest insulating values available on the insulation market today. It’s sprayed as a liquid into the intended area and expands to several times its initial size, filling crevices, gaps and other hard-to-reach spaces. This creates a very effective air barrier. In addition to excellent insulation attributes, applying SPF insulation to exterior walls and attic ceilings also provides additional structural support and racking strength. There are two types of SPF insulation— closed cell and open cell. Closed- cell SPF is comprised of tiny cells packed together tightly and inflated with a gas that causes the foam to expand. Closed-cell SPF is more durable than open-cell, has a higher R value and a stronger resistance to air and moisture and
is the choice for high-performance hybrid systems. One downside to using SPF as a stand-alone insulation is that it can have a significantly higher installed cost than fibrous insulations. A hybrid insulation system, however, gives homeowners the same air permeance performance by applying a 1- to 2-inch flash coat of closed-cell SPF. One inch is all that is needed, as SPF’s superior air resistance meets code-required air infiltration standards. The remaining portion of the wall cavity can then be filled with fiberglass batt or blown-in loose-fill fiberglass insulation.
FIBERGLASS INSULATION Fiberglass is the most commonly installed insulation material for a variety of reasons—it is readily available, easy to install, naturally fire-retardant and provides proven thermal resistance that won’t lose R value from settling. The flash coat of closed-cell SPF insulation in hybrid systems provides air sealing and allows fiberglass insulation to perform to its optimum level, rounding out the energy savings performance while providing unmatched acoustical performance. M a ny hybr id i nsu lat ion sys tems call for fiberglass batts, since they are a very familiar product to all contractors. However, using a blown-in loose-fill insulation is an even more effective option and highly recommended, as it can fill more nooks and crannies and it can deliver
September 2011 | www.wconline.com |
17
Insulation SYSTEMS ENGINEERED RIGHT
a greater thermal performance than batt insulation.
SMART VAPOR RETARDER Smart vapor retarders, made from a polyamide film, are a relatively new development in the building products industry and are known for their ability to change permeability with ambient humidity conditions. This process allows closed building envelope systems to help reduce the risk of mold and mildew problems by increasing their drying potential with seasonal climatic changes. With a high resistance to water vapor permeance throughout the winter, smart vapor retarders protect the hybrid cavity like traditional poly or kraft vapor retarders. But unlike traditional solutions, SVR can react to relative humidity by altering pore size, allowing water vapor to pass through it. When conditions change within the cavity— and relative humidity increases above 60 percent—the pores in the material expand and its permeability increases. This trans-
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| Walls & Ceilings | September 2011
Insulation SYSTEMS ENGINEERED RIGHT
formation permits drying to occur in the cooling season through the process of vapor diffusion. Thus, its lowered vapor permeance supports the drying process only when needed, which decreases moisture accumulation within the wall cavity as well as moisture damage and mold growth that can result. Smart vapor retarders can be used in place of traditional vapor retarders with unfaced fiberglass insulation to provide an insulation system that is ideal in some of the more severe climate condition areas, in terms of both temperature and humidity. In addition, they may be installed as an interior air barrier system combined with recommended tapes and sealants. It is important to consult state building codes before installing, as vapor retarder placement can vary between climate zones.
WORKING TOGETHER AS A SYSTEM A hybrid insulation system featuring closed-cell SPF insulation,
blown-in fiberglass insulation and a smart vapor retarder provides a thermal protection and air and moisture resistance similar to that of a wall cavity filled with closedcell SPF insulation. An insulated 5½-inch wall cavity with batt insulation alone would produce an R value of between 18 and 21. If the cavity instead had blown-in fiberglass insulation by itself, the R value would be about 23. With a hybrid system, the R value increases to 25 as well as a superior air barrier provided by the SPF. A s st ated ea rl ier, one of t he biggest selling points of a hybrid insulation system is its ability to reduce air infiltration while offering greater thermal performance and smart moisture control. Air sea l i ng is requ i red by most of today’s building codes, so why not expand your offering to include hybrid insulation systems and provide a more effective air seal and increased thermal resistance all in one system? In the long run, the
benefits to the home or building owners will significantly outweigh a slightly higher installed cost. Hybrid insulation systems truly offer the best of both worlds in insulation performance. W&C Randy Straight is manager of technical services at CertainTeed Corp. If you read this article, please circle number 275.
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