Insulation, Air Sealing

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

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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

A Thermal Peek Inside Walls: IR Cameras 101


For the price of a drywall repair, you can look inside walls with a thermal camera at insulation and air leaks

Picking a Puffer to Smoke Out Your Air Leaks


You can use your hand to detect some air leaks, but smoke puffers make other air leaks easier to "see."

Why Does Insulation Matter?


Insulation does more than slow heat flow: it sells houses, future proofs, makes floor plans bigger, and sends your kids to college. Really.


Interior Soffits That Don't Leak

Soffits should be tight boxes hidden in your ceiling.

High Performance Handbook

Two packages for high performance homes. Vented and unvented roof insulation retrofits and exterior wall insulation details along with rainscreen wall details for furring strips.

The Pen Test for Air-, Water- and Thermal-Tightness

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Water and air leaks in a building shell are difficult enough to detail on simple buildings. Complex structures can cause headaches for builders, remodelers, and architects who don't pick up their pens and trace at the design stage.

Installing a Vapor Barrier in a Sealed Crawlspace


Crawlspaces offer all of the headaches of a basement and none of the benefits.