Insulation, Air Sealing

Air Sealing a Dropped Soffit: Why and How in Three Minutes


When air sealing a house, begin with the biggest holes and work toward the small ones

Infill Foundation for a Four-Story Passive House


"In order to maximize the buildable area on the infill lot, we had to go fairly deep and do some extensive shoring."

—Dan Whitmore of Hammer & Hand 

Thermal Bridging: A Podcast About BS (#buildingscience)


This is the first episode of 7 Minutes of BS (building science). We break it down with engineers and building scientists.

Superinsulated Sunroom (3): Flashing an Outie Window


Wide tape spans the many layers of a thick wall to make an air tight and water tight seal

Superinsulated Sunroom (2): Nail Bucks for (Outie) Flanged Windows


Window banks need to line up neatly for the trim to work out. Foam walls add the extra possibility of compressing the backing. So there's that.


Warm and Dry Monolithic Slab with Brick Ledge


Adding brick to the outside of a house complicates insulating outside a slab. So Insulate inside.

Superinsulated Sunroom (1): Exterior Foam Layer


A superinsulated sunroom might sound like an oxymoronic idea, but it is not. Just use triple glazed windows and thick foam over the wall framing and roof

Innie Window Installation On an Exterior Foam Retrofit


A deep energy retrofit in Concord, MA illustrates everything you need to know to bring a house to energy überville

Slab Edge Insulation: Why it Matters


You can't stop heat flow, but you can keep your floor from becoming a big ol' heat sink

Installing an In-Betweenie Window (1): Sill Pan Flashing


Flashing an In-Betweenie window is a lot like flashing an Innie or an Outie, only it is somewhere in between

The What, Why, Where, and How of Blower Door Testing

John Straube is excited about blower doors!

Everything there is to know (well, almost) about blower door testing with a few engineer-y jokes along the way.

Frost-Protected Monolithic Slab


An affordable insulated slab foundation suitable for climate zones 4, 5, and 6