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Middlesex VT: Foam-free, WUFI-verified, and OSB-free high performance
Project Spotlight 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...
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Unvented Foam-Free Roof Retrofit With Dolphin Insulation
There's a growing demand for high performance roof retrofits. For many homes it can be most practical and economical to improve the airtightness and insulation from the interior. Often the...
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The Ten Golden Rules for Foam-Free Flat Roofs
When insulating a flat roof wood structure, 475's goal, as always, is to do it in the most healthy, structurally sound, durable, and ecologically friendly way—achieving truly high performance. This...
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Project Spotlight: Simple Life Homes' Foam Free Prefab Assembly
Creating Comfortable, Foam-Free, All-Electric Senior Homes In Ontario’s Ski Country There are several hot topics we look out for here at 475: foam free building, Smart Enclosures, prefab manufacturing,...
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The 8 Golden Rules for Foam-Free Unvented Asphalt Shingled Roofs
When insulating a wood roof structure, 475's goal, as always, is to build in the most healthy, structurally sound and ecologically friendly way – thereby achieving truly high performance....
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Rowe Hill: Foam-Free Deep Energy Retrofit (DER) by Maine Passive House
NOTE: Since completion of this project, 475 has replaced the DA Membrane with INTELLO X Rowe Hill House before renovation Jesper Kruse, founder of Maine Passive House, contacted us last...
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Waterbury VT Municipal Complex uses INTELLO Plus for Foam-Free Enclosure Moisture Control
Waterbury VT Municipal Complex uses INTELLO Plus for Foam-Free Enclosure Moisture Control INTELLO Plus from foundation to roof: all interior walls and ceilings of this building include Pro Clima's airtight...
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Foam Fails
Introduction to 475's Foam Fails Series If we are to address our concerns of health, climate change, safety, energy efficiency, resiliencey, and reliability, then we ask you to seriously consider...
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Is Foam Evil? A New Paradigm of Foam - Less is Best
"Is Foam Evil?" was the initial title of a panel discussion 475 participated in at NESEA's Building Energy 15 Conference - before it was renamed "Tiny Bubbles" (see Green Building...
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Reason Foam Fails #4 - Counterproductive Vapor Retarder
Counterproductive Vapor Retarder As insulation levels increase, building enclosures get colder and are more resistant to drying out - staying wetter longer, and posing greater risks for mold and...
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Reason Foam Fails #1: Dangerous Toxic Ingredients
Dangerous Toxic Ingredients The chemical companies selling polyurethane foam as green and sustainable, demonstrate chutzpah second only to that of the tobacco and coal industries. Admittedly, if you believe...
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Reason Foam Fails #3 - Degrading Thermal Insulation Values
Degrading Thermal Insulation Values Polyisocyanurate (polyiso), XPS, and spray closed-cell foams substantially degrade over time as the insulating blowing agent gases diffuse out and plain air diffuses in. How...
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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...
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Welcome to 475.Supply’s Brooklyn Headquarters
We proudly completed our headquarters office at 369 Warren Street in Brooklyn in early 2025. With critical support from Empire State Development (ESD), which invested $120,000 in the retrofit based...
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Builder Spotlight: Maria Klemperer-Johnson of the Hammerstone School and Hammerstone Builders
The builders, architects, and building owners we work with never cease to impress us. Our customers bring a level of experience and deep commitment to high performance construction that is...
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Gutex-Wrapped Tiny House in Arkansas
Experiences Using Passive House-Supportive Products on Our Tiny House on Wheels This guest article was written by Rachel and Donovan, the good folks behind tinyhappypeopleblog.com. Go check them out to...
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Ashfield MA: Deep Energy Retrofit (DER) by Quigley Builders
Quigley Builders recently completed a Deep Energy Retrofit (DER) project in Ashfield, MA, known as one of the Hilltowns of Western Massachusetts. I stopped by on several occasions to meet...
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How And When Smart Vapor Retarders Should Open Up -- INTELLO's Decade+ Of Safe Construction
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...
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5 Steps For Sealing Intentional Holes in Your Air Barrier
A continuous air barrier is one of the defining design details of Passive House and high-performance building. The red line that many of us draw on blueprints to indicate the...
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Cambridge MA - Small Urban 2-Story Gets a High Performance Upgrade
Here's a sweet example of a successful Deep Energy Retrofit (DER) with airtight, foam-free walls and high performance ductless ventilation. The designer and GC is Jeff Geisinger, a Boston-based architect...
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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...
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A Tiny House Plan Proving Big Ideas
Project Spotlight: Terran Palmer-Angell Our customers are typically interested in building better - with more concern for the environment, energy use, natural materials, and people’s health. Occasionally we have...
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Unvented Flat Roofs: A Technical Discussion
Flat roofs have often been built with the insulation all on top of the vapor closed drainage plane - as this avoids dew point condensation issues inboard of the roofing....
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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...
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