August 27, 2014 GutexIntroVideo

Introduction to GUTEX

475 Technical Director Floris Keverling Buisman gives us a video introduction to the GUTEX wood fiber insulation boards. This brief video describes some of the important points of GUTEX including its ability to shed water, acting as roof underlayment and insulation board in one. This tongue-in-groove, reclaimed wood material is widely used for high performance […]

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June 20, 2014 sheetrock ready

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 with owner Mary Quigley. On my first visit, Mary invited her crew along with electrical and plumbing subcontractors to hear my presentation titled Foam-Free High Performance […]

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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

DWG Construction Details for Deep Energy Retrofit (DER) Foam-Free Assemblies

DER renovations are particular animals. While navigating often mysterious and disjointed existing assemblies, there’s much head scratching about how to achieve the long-term performance one wants with renovation work that accommodates occupied and/or finished interiors. 475 is very happy to release a new addition to our free, downloadable collection of construction details: a DWG file for a […]

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November 11, 2013

Rowe Hill: Foam-Free Deep Energy Retrofit (DER) by Maine Passive House

Jesper Kruse, founder of Maine Passive House, contacted us last Spring to discuss details on the renovation of his Rowe Hill house. We had recently finished our Foam-Free Deep Energy Retrofit (DER) blogpost and were working on our first set of construction drawings. We discussed options and collaborated on a design that offered the easiest and best […]

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April 3, 2013

Foam-Free DER: Wall & Foundation Assemblies

In this post we examine the deep energy retrofit (DER) of existing wall & foundation assemblies. As we outlined in Foam-Free DER: Series Introduction (here), we are looking at the recommended assemblies provided in the Mass Save Deep Energy Retrofit Builder Guide (the Guide), and offering foam-free alternative approaches.  Also as noted in the introduction, we are starting on the […]

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April 2, 2013

Foam-Free DER: Roof Assemblies

In this post we examine the deep energy retrofit (DER) of existing roof assemblies. As we outlined in Foam-Free DER: Series Introduction (here), we are looking at the recommended assemblies provided in the Mass Save Deep Energy Retrofit Builder Guide (the Guide), and offering foam-free alternative approaches.   Also as noted in the introduction, we are starting […]

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March 31, 2013

Foam-Free DER: Series Introduction

The deep energy retrofit (DER) is essential to our low energy building future – as most all buildings that will exist (in our lifetime) do already exist.  The most authoritative DER guide for  the Northeast is the Mass Save Deep Energy Retrofit Builder Guide.  (the Guide)  Download the Guide here (pdf). Produced by the Building Science Corporation,  the Guide […]

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