Building Science

Monitoring Home Performance
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Monitoring Home Performance

Certain home performance problems are hard to catch because you may not be at the... More

Major Surgery for a Failing Fat Wall
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Major Surgery for a Failing Fat Wall

The worst decades for building science weren’t in the 1800s; they were late 1970s... More

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Repairing a Rotting Roof

Reducing indoor humidity was a critical first step. More

Insulating a Roof Parapet
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Insulating a Roof Parapet

To keep a masonry wall within the conditioned envelope, crews wrap the building’s... More

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Wrapping an Old House in a Passive House Puffy Jacket

Mid-coast Maine builders EcoCor, Inc., are applying their characteristic insulated wood I-joist exterior wall system package to an existing old house. More

Brooklyn Passive House: Sealing the Envelope
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Brooklyn Passive House: Sealing the Envelope

In a brick row house in Brooklyn, a builder applies advanced coatings and... More

Thermal Imaging With a Blower Door
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Thermal Imaging With a Blower Door

Though it's impossible to seal every hole in an existing building to prevent air... More

Best Practices: Continuous Exterior Insulation
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Best Practices: Continuous Exterior Insulation

A guide to selecting and installing rigid foam on walls. More

Venting the Crawlspace
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Venting the Crawlspace

Most crawlspaces are vented to the outdoors, but encapsulating the crawlspace has... More

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Air-Sealing for Hot Climates

Excluding heat and humidity saves energy, improves comfort, and increases durability More

Building a Simple Passive House
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Building a Simple Passive House

In September 2009 I completed a deep energy retrofit on a small house in Point... More

Net Zero House for a Cold Climate
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Net Zero House for a Cold Climate

An architect shares his plan and process for building a northern Vermont house... More

Solving Moisture Mysteries with an Infrared Camera
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Solving Moisture Mysteries with an Infrared Camera

Temperature differences between dry and wet spots can provide important clues. More

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Building Science Instruction

Tight House Construction - Sealing Exterior Sheathing Seams
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Tight House Construction - Sealing Exterior Sheathing Seams

In my quest to build ever tighter houses I've decided that my goal is for every... More

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The Best Air-Sealing Tips and Tricks for Homebuilding and Remodeling

Use specialized tools and materials and a methodical approach. More

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Stopping Condensation Behind Knee Walls

Q: A house we built about eight years ago here in Tennessee has ductwork running through the space behind the upstairs knee walls. The exterior side of the framing has been developing condensation, but only in extremely cold weather. There are no vents in More

Q&A: What’s the Dewpoint?
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Q&A: What’s the Dewpoint?

Q: When people refer to the dewpoint in a wall assembly, are they talking about a... More

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Q&A: Right Size for an Insulating Air Space

Q: How big does an air space need to be before it stops working as insulation and starts working as a convective loop? More

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