June 14, 2017
Dense pack insulation is a great way to insulate – whether it be cellulose, wood fiber (Thermofiber by GUTEX), sheeps’ wool (by Havelock wool), or fiberglass. It can guarantee gap-free thermal protection, filling all the nooks and crannies. But typical mesh-netting systems for dense pack insulation like Insulweb do one – and only one -thing: contain […]
EcoCor’s Founder talks Passive House, Pro Clima, and his path through high-performance construction Chris Corson, of EcoCor High Performance Building Systems, talks to us about how he developed EcoCor’s signature panelized construction techniques and Passive House Institute Certified building assembly. Chris makes the powerful point that even as other industries have made quantum leaps in technology and precision […]
The Wall Street Journal article, titled online, Striving for Energy-Efficiency in New York, by journalist Keiko Morris, captures the magnitude of the sea change in Passive House building, in a quote by 475’s own Ken Levenson: In 2010, the New York region had about 50,000 square feet of passive-design building projects planned, said Ken Levenson, founding board […]
Make your way to 125 West 18th Street this Friday – and you won’t regret it. It is going to be a great day of Passive House presentations, discussions, and networking from leading professionals, practitioners, policymakers, owners and suppliers from across New York and the world. From financial analysis of Passive projects to the feasibility of […]
Monitoring real life assemblies is the best proof of performance. This is how we know Pro Clima products make construction as safe as possible. ECOCOR monitored a foam-free, un-vented flat roof in Maine and clearly demonstrated how elevated assembly humidity in a super-insulated assembly can safely dry inwards through INTELLO Plus. As we describe in the presentation High […]
Sequencing For Making Flanged Windows Airtight Flanged windows are ubiquitous in American construction. As we push toward higher levels of enclosure performance – with increased insulation levels, airtightness and vapor control – window specifications are getting more robust too. And while it can be a relatively straightforward thing to select a better window, it isn’t so readily clear […]
After HVAC systems, water heaters can be among the biggest energy sinks in a building. Although high-performance building strategies can allow you to dramatically downsize your HVAC systems, supplying hot water can remain a challenge for those seeking to reduce building energy loads. Fortunately, the ideal solution to the challenge has arrived: the SANDEN SANCO2 Heat […]
What Are We Doing? Are we kidding ourselves? Trying to be a conscientious consumer, we try to pick sustainable materials and products – making more sustainable decisions – with the desire to “vote with our wallets” and promote “green industry” that will have beneficial effects in our fight against climate change and other environmental and social […]
When advocating for Passive House buildings it’s often not very convincing to point to successful projects in other countries. People understandably want to see local professionals working successfully with local builders and local owners. Local examples of Passive House building are critical to achieving popular acceptance. Consequently, 475 is happy to support the recent publication of […]
Ensuring a continuous air barrier is top priority for high-performance building. Joint connections between different materials can be especially challenging points to airseal. Acrylic caulk adhesives can solve some of these problems, but is not always the fastest way to a robust connection. For example if you’re attaching two airtight, vapor-closed surfaces, such as the […]
Passive House Windows, Not Only For Passive House The core of Passive House is about energy performance, but the reasons we love aiming for the standard are all the other accompanying benefits. We want the comfort, the indoor air quality, and the silence. And we want the design to work for us. We saw a great example of […]
Five members of the 475 crew had the opportunity to travel to Europe over the last several weeks. The main target was to attend the 21st Annual International Passive House Conference in Vienna. While we were in the neighborhood, we couldn’t resist meeting up with a few of our favorite manufacturing partners: PRO CLIMA, GUTEX, […]
While some might have serious issues with 2016, this year is shaping up to be pretty great for your friends here at 475. We have several things in the works that we’ll be announcing in the following months. But as with any business, everything starts with the people who make it. On that note, we’re […]
The 475 team recently had the opportunity to travel to Germany and spend a few days at Pro Clima headquarters in Schwetzingen and meet not only the entire Pro Clima crew, but also with fellow distributors from New Zealand and Ireland. Of course we focused on building science, testing, development, and new innovations for the […]
475 is excited to present this guest blog post by Brad Hankins, a designer-builder from Langley, WA. Long committed to sustainability, Brad knows the environmental benefits of high-performance construction. But Brad was also interested in understanding how quickly investments in energy efficient design pays for themselves, an important factor in convincing homeowners to jump on the high-performance bandwagon. […]
Spray foam throws off two forms of toxic poison: off-gassing of the volatile organic compounds and uncured chemical dust. Spray foam is a two-component chemical system: Part A and Part B. When the chemicals are properly prepared and precisely mixed, under the right site conditions, the chemicals will have a complete reaction eventually and become inert, ceasing to […]
For thousands of years buildings were made with a keen regard for nature and historically building science was intimately attuned to natural phenomenon. Then, the 20th century builders, with giant resources of energy and rapid scientific advancements tried to conquer the vagaries of nature. Natural solutions were ignored and flaunted – they made up, down, and down, up – if they felt […]
Because you love sending us examples of the many creative and improvisational ways you end up using our handy high performance materials, this is a continuing series . See Part 1 and Part 2 of The Best of Off-Label Uses, and keep your images coming through on twitter, facebook, or instagram #OffLabelUses. Vehicles of all types have […]
475 forms The Best Practices Institute© & The Perfect Building Standard™ This is a moment of mixed emotion at 475. We are sad to witness the death of Passive House but excited to steal its best aspects and make our own proprietary standard – The Perfect Building™, administered by our very own Best Practices Institute©. […]
We sell Pro Clima tapes because they are incredible products. They promise long-term airtightness that will last for 100 years, are highly flexible to stay airtight as your building moves and settles, and the solid acrylic adhesive involves no solvents, is moisture-tolerant, and is easy to apply. We could go on… But the key to the success of […]
The Smart Wall is an essential part of the Smart Enclosure and represents a return to fundamental principles of building science. We leverage the basics of natural principles with highly selective technological innovation and manufacturing – working in harmony with nature, not in opposition. The Smart Wall system is made of efficient, resilient and sustainable products, including HAVELOCK WOOL sheep’s […]
What exactly do we mean by high-performance building? What are some of the obstacles to building this way? And when compromises have to be made, how can we make cost-effective choices and still construct a high-performance, low-energy, and maybe even Passive House building? In this presentation, we talk about the 6 key characteristics of high performance […]
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 […]
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 […]
Is your attic outside your thermal enclosure? If so, access to that attic space should be carefully considered. You want easy and comfortable access but also need to maintain the continuity of the airtightness and insulation layers. Needless to say traditional attic stairs do not deliver the needed performance. Until today, the best […]
Daylighting’s known benefits include better student performance and faster patient recovery in medical facilities – so this beautiful roof, in a building that houses the University of Leicester’s medical education, health sciences and psychology departments, serves as an example of striking design that is sensitive to the needs and comforts of occupants. Now the largest Passive House […]
Installing exterior vapor retarding layers such as asphalt roofs, flat roof membranes and OSB sheathing can create challenging situations in well-insulated walls and roofs. However, such assemblies can be safely built and insulated when using a smart vapor retarder and airtight layer on the interior – even in colder climate zones (4 and up). To make these […]
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 […]
It’s important that a building’s air barrier and insulation be dimensionally stable – or resilient to movement. Foam is neither. The curing process after spray foam is applied inherently entails shrinkage and hardening. Not only can such shrinkage result in pulling back from stud bays and other connections – which often leads to gaps in the […]
We’re very excited to see so many images of GUTEX wood fiber board insulation popping up on projects across North America. Along with being the healthiest and most sustainable rigid insulation available… it also turns out to be pretty photogenic. Too bad you have to cover it up. Check out these pioneers in foam free […]
