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The Ten Golden Rules for Foam-Free Flat Roofs

The Ten Golden Rules for Foam-Free Flat Roofs

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 means we try to generally avoid using foam above or below the roof deck (for more on that, see … read more

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Introduction to Lamilux Skylights

Introduction to Lamilux Skylights

Introduction to Lamilux Skylights Efficient daylighting is fundamental to high-performance sustainable buildings, and nothing brings daylight into a space as effectively as a skylight. The challenge with skylights in a high-performance building is that roof glazing complicates the continuous air barrier that is crucial to minimizing t … read more

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JLC Reports on Success of Foam-Free Unvented Flat Roof Assembly

JLC Reports on Success of Foam-Free Unvented Flat Roof Assembly 475 enables more robust assemblies that are less toxic. Such was the case with the Whitchurch home in northern Vermont - working with the owners and their dedicated Passive House team at Montpelier Construction. The walls were a variation on the I-Joist outrigger configuration w … read more

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Award-Winning Design with LAMILUX Skylight Daylighting

Award-Winning Design with LAMILUX Skylight Daylighting On Pearl Street in the DUMBO neighborhood of Brooklyn, New York, Alloy Development produced five new townhouses which won the SARA NY 2015 Bronze Award of Merit, as well as The Architect's Newspaper Best of 2015 Residential Multi-Family. To deliver the most comfortable, healthy and susta … read more

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Unvented Flat Roofs: A Technical Discussion

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.  However in many situations the insulation may need to be primarily or entirely below the flat roof membrane and between the roof j … read more

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How to airseal a (rowhouse) roof

How to airseal a rowhouse roof Working from top to bottom we start with the easy part, the roof.  To not have to seal an additional 40+ roof joist (so 80+ joist penetrations into the load bearing party wall) it is recommended to use INTELLO Plus under these joist. This conveniently puts the airtight layer on the inside of these joist and thus … read more

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