February 14, 2017 airtight gap

Top Ten *NO* Eleven Air Barrier Failures

1. It’s not continuous! The mother of all failures. You don’t have an air barrier if it’s not continuous – it won’t be air tight. Many of the items that follow below are all causes of discontinuity. Like a balloon or a submarine – the continuity of the airtight layer must be sacrosanct. While discontinuity can […]

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September 9, 2016 ridge-vent

Vapor Venting An Unvented Roof: In Praise of Belts and Suspenders

Planes can fly safely with one engine. And you can keep your pants up with just a belt. But if you’re looking to be protected from fools, then adding suspenders to the belt might be what sets you free. So while we’ve previously outlined the essential importance of inboard airtightness and vapor control and have specifically written […]

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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 2, 2016 Warkentien Forest Ave house and car (1)

The Returns From Indiana Are In: 0.4 ACH50 For The Win!

Cruz, Clinton, Trump, Sanders…Warkentien? Dave Warkentien lives in Indiana and recently earned winning numbers: 0.4 ACH50.   He also got winning returns on power usage: at negative 457kWh for the first three months of 2016 (and that’s after accounting for two electric cars usage of 655kWh). We haven’t seen numbers like that since the SURE House won the DOE Solar Decathlon. The wins […]

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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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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 GreenBuildingAdvisor.com, 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 9, 2015 DeclareImageSmall

Pro Clima’s Best-Sellers Achieve Declare Label

Product Transparency Comes Into Focus For INTELLO Plus, TESCON VANA, and TESCON Primer RP 475 has achieved the Declare building product transparency label for our best-selling tapes and membranes. The Declare label aims to transform the marketplace through transparency and open communication by serving as a voluntary ‘nutrition-label’ for building materials. Declare integrates with the Living Building […]

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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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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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May 7, 2015 IntegratedService

Project Spotlight – INTELLO Plus with “Integrated Service Cavity” in Leicester VT

One of the most popular high performance walls is the double stud wall. Its appeal lies with the fact that it creates a good thermal break between two simple-to-build wood frame walls. It can also be economical, even before considering long-term energy savings. The open cavities are typically dense-packed with blown-in cellulose or fiberglass for insulation values ranging from R-30 to R-50 […]

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April 2, 2015 JaneSandersInterior

Why New Yorkers Love Passive House

This video speaks for itself. We featured this project in a previous video – 475 On-Site: Historic Brownstone Passive House Retrofit in Brooklyn, NY. It is in process to receive EnerPHit certification with architect, Jane Sanders, and builder, Build With Prospect. So how does this work? Airsealing and insulation. These two measures increase comfort, while drastically reducing energy and outside […]

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March 17, 2015 VanaSale

Spring Pricing Is Here

Stock up on our best-selling items and start the season off right Thawing out from this hard winter makes spring all-the-more vital for building professionals. That’s why, until 5/1/15, 475 is offering new lower prices on our most popular items. It’s time to stock up for the building season. 475 is growing. And our goal […]

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January 16, 2015 IMG_6359

Hanover, NH: Dartmouth College Dormitory Retrofit

Countless historic masonry buildings dot the American landscape, a large number of them falling under some form of aesthetic scrutiny prohibiting exterior insulation. The only option to make these buildings energy efficient is to insulate them on the interior. 475 High Performance Building Supply works with architects and builders to insulate these walls safely from the interior – considering moisture drive, bulk rain water […]

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December 30, 2014 proclimaCANADA

Press Release: 475 Granted Exclusive Pro Clima Distribution in Canada

FOR IMMEDIATE RELEASE Building Airtightness Specialists Offer New Solutions to Canadian Builders German Airtight Building Leader Grants Exclusive Canadian Distribution to 475 High Performance Building Supply New York City – December 30, 2014 475 High Performance Building Supply (475), a building materials company based in New York City, is offering a new solution for building […]

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November 5, 2014 Lothar in Vancouver

West Coast Pro Clima Tour Recap

Pro Clima founder, building scientist, and INTELLO inventor Lothar Moll along with Jens Lüder Herms, head of Pro Clima R&D, toured the west coast in mid-October with me (Floris) to present information, see common construction practices, and analyze how to improve the quality of construction. This trip also coincided with 475 opening of our west coast warehouse, which will […]

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September 18, 2014 headline-whitchurch

Middlesex VT: Foam-free, WUFI-verified, and OSB-free high performance

The town of Middlesex, Vermont, located just north of Montpelier, has put itself on the high performance building map. Leading the way is the new “Whitchurch Passive House Cottage” – not only in terms of energy efficiency (Passive House certification is in the works), but also as a unique and adventurous example of “form follows function”. The project […]

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March 25, 2014

5 Reasons Why Airtight Drywall Is Obsolete

After perhaps keeping the rain out, airtightness is the most important thing we can do to make our buildings energy efficient and comfortable.  That’s a building science fact.  A fully functional air barrier is fundamentally important to the proper functioning of the building.  Consequently we should take necessary steps to ensure that the airbarrier works, […]

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February 19, 2014

475 Does WUFI®: Mold Potential and Historic Masonry Retrofits in Climate Zone 6 (Burlington, VT)

A key piece of the puzzle as we decarbonize our building stock is successfully retrofitting historic masonry buildings to high performance standards that provide energy efficient operation and comfort while preserving the structural integrity of these timeless buildings for future generations. We have written often that preservationists and energy efficiency advocates need not be in opposition, […]

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January 13, 2014

Keeping Sheathing Dry in High-R Double-Stud Walls – a WUFI study

(The is the second installment in the 475 blog series 475 Does WUFI. ) Double-stud walls have become a popular and cost efficient way to build well-insulated envelopes: two 2×4’s spaced apart easily makes a R-40+/10.5″ thick wall. Such walls also include a thermal break and can be insulated with densepacked cellulose or fiberglass, both […]

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December 12, 2013

Tight Historic Masonry Rowhouse Renovation by Caliper Studio

On Prospect Avenue in Brooklyn, NY, Caliper Studio‘s gut renovation of a brick brownstone rowhouse used what has become the typical Passive House project approach: very good triple-pane glass windows, thermal bridge free LAMILUX skylights, and a interior insulation with cellulose and Pro Clima INTELLO membrane as the smart vapor retarder and air barrier. We […]

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November 26, 2013

The INTESANA Primer: The DER Solution

The INTESANA membrane, manufactured by Pro Clima of Schwetzingen Germany, is the state-of-the-art ingredient for Deep Energy Retrofit (DER) interior vapor control and air-tightness in cold and mixed climates. It is an intelligent membrane that changes permeability from 0.17 perms in winter weather to over 13 perms in summer, depending on the relative humidity around it. This intelligent range of […]

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November 14, 2013

Lothar Moll’s East Coast Tour – Presentations and Snapshots

Lothar Moll, the founder and CEO of Pro Clima and inventor of Germany’s own award-winning line of high performance Pro Clima airsealing tapes and membranes, visited us here in the US for a whirlwind trip. Among other topics, he discussed high performance historic masonry retrofits, inboard airtightness, exterior windtightness, and designing complete building enclosure systems that protect against structural damage and mold. […]

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June 18, 2013

Project Spotlight: Hatzolah Central, Brooklyn, NY

Hatzolah Central is the largest private ambulance dispatch in New York City.  To be housed directly adjacent to the elevated subway tracks – noise pollution was a primary concern for this 7,000 sf historic masonry retrofit and adaptive reuse of an existing warehouse. With noise reduction requiring airtightness and triple glazed windows, the decision was […]

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June 18, 2013

The INTELLO Primer

The INTELLO membrane, manufactured by Pro Clima of Schwetzingen Germany, is the state-of-the-art for interior vapor control and air-tightness for cold and mixed climates.  It is an intelligent membrane that changes permeability in a range from <0.13 perms in winter to 13.2 perms in summer depending on the relative humidity around it.   This intelligent range […]

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June 17, 2013

An Interior Air Barrier Does It Better

As more buildings strive to achieve airtightness, a common approach we too often see places the air control layer outboard of the insulation layer – often with OSB or plywood – to the exclusion of an inboard air control layer.  On the contrary, if you only have one airtight layer, this is the wrong side […]

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May 20, 2013

The Ten Golden Rules for Foam-Free Flat Roofs

When insulating a wood structure flat roof, 475’s goal as always, is to build this in the most healthy, structurally sound and ecologically friendly way, achieving truly high performance.  This means we try to generally avoid using foam above or below the roof deck (see our 475 series Foam Fails). With foam out of the […]

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April 17, 2013

Norwich University and Middlebury College in 2013 Solar Decathlon

We are proud to be supporting two US Dept of Energy Solar Decathlon entrants in this year’s contest:  Norwich University’s Delta-T-90 house and Middlebury College’s InSite house – both of Vermont.  The faculty advisor for Norwich is architect Matthew Lutz (far right), and for Middlebury are architects Ashar Nelson (far left) and Andrea Kerz-Murray (not […]

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