March 15, 2017 ecocorencors200x200

The EXTOSEAL ENCORS Primer: The Essential Sill Protection

Window Flashing That Lasts Windows are the weak link in your assembly. Along with doors, they amount to the largest holes in your envelope.  To ensure that your building is air and water-tight, continuity between high-performance windows and your air barrier/WRB is essential. We’ve talked a lot about how to ensure air barrier continuity at […]

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March 14, 2017 MGI with INTELLO double stud fiberglass

New Mold Growth Index and Safe Double-Stud Walls: WUFI Pro Shows INTELLO Plus is Key

Double-stud walls have been regarded as a simple to build, low-cost, high-performance solution since the energy crisis in the 1970’s.  (See our blog post The Double-Stud Wall Simplified: Low-Cost High Performance, and free CAD details)  Pack them right, meaning 3.8 to 4.2 lbs/cubic foot of cellulose, 2.5 lbs/cf for fiberglass or wood fiber – and as Jesse Thompson of Kaplan […]

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January 23, 2017 IMG_1267

Vented High Performance Standing Seam Metal Roof

SOLITEX UM Project Spotlight in Waltham MA SOLITEX UM from Pro Clima is  a 4-layer, vapor open and waterproof membrane with integrated 3-D mesh.  Like other SOLITEX membranes, it has an actively vapor open, monolithic layer of TEEE film that is extremely waterproof (see The SOLITEX MENTO Difference)– and outperforms vapor closed underlayments both in outward drying potential as well […]

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January 23, 2017 Vana_Moving

How to Stay Airtight When Buildings Move

Buildings move. Ensuring that your air barrier is resilient to movement is crucial to ensuring the longevity and performance of your building. Unless you’re building a structure using just one material (like superadobe), your building will consist of an array of different materials. In response to fluctuations in temperature and humidity, different materials expand and contract at […]

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November 22, 2016 crashtestdummy

Drive Safe, Build Safe

As we get ready to drive over the Thanksgiving and Christmas breaks, our minds turn to safety and the risks we take for granted every day.  What’s your risk tolerance? When you drive, do you tailgate the car in front of you or do you leave a safety buffer?  Although you are very unlikely to […]

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September 6, 2016 EcoCor_wrapping_thumb

Airtight In One Minute With EcoCor

Chris Corson and the crew at EcoCor in Searsmont, Maine are brewing a building revolution. Think of it like the modular building version of the Tesla factory. I essentially watched the majority of a building appear over the course of 3 days, built by 5 crew members with laser precision. Passive House, (nearly) foam-free, and built […]

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June 28, 2016

SOLITEX Resource Library

Pro Clima SOLITEX exterior membranes are leading the way to higher performance and better energy efficiency in North American construction. SOLITEX products offer unmatched waterproofing, airtightness and outward drying potential for all types of projects. Their exceptional strength and durability make them suitable not only as housewraps or weather resistant barriers (WRBs) – but also as “sarking” membranes for vapor open […]

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June 24, 2016 Profect


A Pre-Folded Tape That Makes Perfect Corners   Based on Pro Clima’s proven tape technologies, TESCON PROFECT gives architects and contractors a new important tool to make airtight connections at inside corners, quickly and precisely.  TESCON PROFECT is delivered pre-folded in the roll of tape – with only one leg of release paper.  This allows for fast application, […]

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May 27, 2016 BlogThumb

How To Prepare For High Performance Windows

Windows might make you nervous. They’re often big and heavy, yet fragile. And in a high performance building, windows are the most expensive components. But that investment in great windows has a big payoff as well. High performance windows deliver on interior comfort and building efficiency – so you don’t have to rely on energy-sucking HVAC systems […]

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May 23, 2016 double_stud

The Double-Stud Wall Simplified: Low Cost, High Performance

Simplify. We know pushing standard code-minimum construction toward high performance is complicated. So we’re always looking for ways to simplify – to simultaneously reduce cost while optimizing efficiency and occupant comfort. [See our recent post on Breaking The “Upfront Cost Barrier”.] The double-stud wall is a well established method for creating a very economical, durable and […]

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May 3, 2016 contegahfosbintello

Intro to CONTEGA Acrylic Adhesives

What Matters: Strength, Durability, Flexibility and Indoor Air Quality Buildings are often thought of as fixed objects. But in the real world, changes in the weather cause buildings to move – and we need to plan for the fact that they will expand, shrink, adjust and settle. If we are building an airtight building, such as a Passive House, we […]

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April 19, 2016 INTELLO Waterbury

Waterbury VT Municipal Complex uses INTELLO Plus for Foam-Free Enclosure Moisture Control

In August 2011, floodwaters from Tropical Storm Irene decimated the downtown area of Waterbury VT, including the town’s government offices. A sure sign the town has rebounded from that calamity is the completion of the new Waterbury Municipal Complex, a project two years in the making. Designed by Vermont Integrated Architecture of Middlebury VT, and built by ReArch […]

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March 7, 2016 Port Townsend Passive House from Artisans Group

Breaking the ‘Upfront Cost Barrier’

Part One – Lucas Johnson’s long quest for the holy grail of high performance building In his previous career as a green builder, 475’s West Coast Solutions Consultant, Lucas Johnson, was frequently asked to find better alternatives to spray foam and code-minimum membranes.  The goal was to find a cost effective assembly that delivered long-lasting Passive House level […]

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February 11, 2016 intello

INTELLO & DB+ Approved by DIBt for Use in Unvented Hot Roof Assemblies

The highly respected Federal Agency Deutsches Institut für Bautechnik (DIBt)* has certified INTELLO PLUS and DB+,  per German testing standard DIN68800-2, for use in unvented assemblies with vapor closed exteriors.  Such assemblies include unvented metal roofs, green roofs and gravel roof flat roofs, as well as vapor closed pitched roofs with asphalt shingles, EPDM, TPO etc.  With this certification these materials […]

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February 2, 2016 Corson-Ueno Presentation

GreenBuildingAdvisor, Smart Membranes & 475

GBA has been a place to engage in debate with a seriousness of purpose. But the article Smart Vapor Retarders for Walls and Roofs on GBA is not serious. The article is full of strawman arguments, unsubstantiated claims, gratuitous personalization and bait & switch tactics. GBA failed to ask any questions of 475 while reporting […]

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January 29, 2016 IntegratedService

INTELLO PLUS Resource Library

INTELLO PLUS is revolutionizing the North American construction industry. No other product provides the same level of vapor control, airtightness and resilience for your high performance projects. We also know that many builders and architects out there are looking to increase their understanding of INTELLO PLUS – from how it works to how to install it. (more…)

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October 8, 2015

Yes, Unvented Roof Assemblies Can Be Insulated With Fiberglass – A WUFI Post

And Not Just In Climate Zones 2B & 3B: Cold Climates Too A post on August 21st, 2015 on, Martin Holladay asked the question, Can Unvented Roof Assemlies Be Insulated With Fiberglass?  Martin’s post focuses on the marketing of Owens Corning’s ProPink Unvented Attic Insulation System.   The Owens Corning system is only allowed by code in zones 2B […]

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September 25, 2015 Beetle

Pro Clima’s Biomimicry: INTELLO and DB+ Surpass Wood’s Function

Incorporating biomimicry into building materials and design was a major topic of discussion at the recent Living Product Expo in Pittsburgh, hosted by the International Living Future Institute. It’s a concept that deserves consideration, and one that we at 475 have reflected upon. The main idea is to use ecosystem services as templates. Some companies, builders, […]

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August 10, 2015 intellomashpee

INTELLO Plus transforms assisted living facility in Mashpee, MA

  475 High Performance Building Supply is proud to be the supplier of INTELLO Plus intelligent vapor retarder membrane and other Pro Clima products for an Assisted Living Facility in Mashpee, MA. According to their website, “Bridges® by EPOCH at Mashpee continues our commitment to providing the highest-quality senior living experience and care exclusively for those with Alzheimer’s disease […]

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August 6, 2015 profilcorner

Pre-make Window Corners With TESCON Profil

One of the hardest parts to properly make a house airtight is making the air control layer absolutely continuous: to go around the drawing and through every detail without picking up the red pen.  This is especially true at the 3 dimensional connections of inside corners, which don’t necessarily announce themselves in 2 dimensional drawings. At […]

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August 3, 2015 2xEbookipad-300x200

New 475 eBook: High Performance 2x Framing

This free details guide is the third in the 475 ebook series 2x wood frame construction is very common and typically provides poor performance. This free ebook illustrates how we can transform the 2x approach into a high-performance enclosure that affordably delivers the highest levels of comfort, energy efficiency and longevity. Airtightness disproportionately effects enclosure […]

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July 30, 2015 ServiceCavity

The Service Cavity – Making Airtight Construction Easy

We know that the importance of airtightness is second only to keeping the rain out.  This is because airtightness greatly effects indoor air quality, thermal comfort, and energy efficiency – while protecting the enclosure from moisture damage (see here).  Given these pretty convincing reasons, what should our airtightness target be, and how does a service cavity help […]

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July 14, 2015 IntellovsOSBvsPlywood2

Why The Vapor Curve Matters

How vapor variable materials stack up when it comes to mileage and protection Intelligent membranes, or smart vapor retarders, can help prevent condensation in enclosure assemblies (walls and roofs) in winter, while allowing inward diffusion in summer. This transformation is important to assure the safety of an insulated assembly, by increasing its drying reserves so it can cope with (unforeseen) moisture — both into […]

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July 7, 2015 Vana Intro

What We Mean By Permanently Airtight

You may have heard us refer to a Pro Clima tape or adhesive as ‘permanently airtight’. It’s important that we are clear about what we mean, because this is one of the details that sets Pro Clima tapes apart from the rest of the pack. Having an airtight layer that endures for the life of a building can depend […]

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July 5, 2015 TESCON VANA

6 Reasons Pro Clima Airtight Tapes are Best

You have a choice of air sealing tapes, so why choose Pro Clima?  With six solid reasons making the case, it’s easy to say Pro Clima tape is the best: Reason #1: Pro Clima Tapes Have The Best Stick The pressure activated adhesion of Pro Clima’s solid acrylic tapes are second to none, as proven by […]

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April 14, 2015

Applying Extoseal Encors

Window sills see a lot of water. This is largely because glass is very waterproof, so all the rain that hits a window will end up on the sill. All that water needs to be directed outwards. For that to happen, first sills need to be proper pitched, especially if windows are set deeper into […]

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March 2, 2015 profilbeforeafter

Tescon Profil’s New Look

Thanks to your feedback, our best-selling window tape, Tescon Profil, has a new look. Customers tell us they love using Tescon Profil to easily make airtight connections to window frames, door openings, wood framing (joist, beams,studs) and steel profiles. We also heard that, on the building sites, it was easy to confuse this tape with our flat-seam-sealing standard: Tescon […]

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February 12, 2015 solitex um grey 3

Project Spotlight: Lincoln, VT Shows Off SOLITEX UM

  Vented rainscreens for walls and roofs are are an important part of high performance construction. In our blog post Vented rainscreen: what a high performance building wants, we argue that a rainscreen is a good idea pretty much across the entire USA (and Canada), for the following reasons: It keeps the sun and the majority of rain […]

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