Insulation & Air Sealing

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

How Deep is Deep Enough to Bury Ducts?

Turns out, ducts buried under insulation actually can work to save energy and eliminate condensation inside the ducts. If you seal and insulate them first


How to Install Cellulose Insulation in an Attic—Alone


Blowing a thick bed of insulation into an attic is really a two-person job, but you can do it by yourself if you have to

Sealing Holes in Bath Fan Ventilation Duct System (Energy Star 5.1.4)


A tight path to the outdoors keeps the indoors fresh and you can call it a day because you’re one step closer to the Energy Star.

Seal Holes from Pipes and Wires


An item on the Energy Star Thermal Bypass Checklist. Item 5.1.2, to be exact ...

Air Sealing Details for a Net Zero Energy Home

The air sealing process for a high performance home with double-stud walls. 

Energy Star 2.1: Walls Behind Tubs and Showers

Energy Star 3.1.1 Walls Behind Tubs.jpg

Tight makes right behind tubs and showers—because they can be *ruff* to retrofit

How The 2015 Energy Code Affects Historic & Existing Buildings

You can dig in to the roof without adding more insulation, but you can't dig far

Airtight Drywall: Step by Step


With blower door tests in the building code, it is up to more than just the insulators or the GC to deliver results: many trades have a stake.


Weather Barrier #DoneRight


Weather Barriers done right means weather barriers that go to work on more than just sunny days