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3799 Main St. #87024
Atlanta, GA 30337


Advanced residential construction and home improvement consulting and owner's advocacy in Atlanta, using the latest building performance diagnostic and modeling techniques and tools. Airtightness, insulation, HVAC, ventilation, moisture, and air quality and EMF consulting for homeowners and building professionals alike.


Home performance articles and stories from the field with internationally respected building forensics guru Corbett Lunsford at the Building Performance Workshop. Hear new episodes of the Building Performance Podcast, see new videos from the Home Performance YouTube channel, and learn all about how diagnostic testing (more than an 'Energy Audit') can make home improvement and new home construction a proven process!

Filtering by Tag: how to

Ductless vs. Ducted HVAC + Duct Cleaning

Corbett Lunsford

Have you ever wondered whether you should replace a home's HVAC system, or have the ducts cleaned? Spend a Healthy Indoors Minute exploring the complexity of invisible dynamics influencing any of these choices. Ductless minisplit heat pump compared with ducted split system heat pump, or furnace and A/C. Cleaning ductwork vs. cleaning house. No stone unturned in these 4 minutes of discussion. More at:

See the show at:

How to Install WRB Sheathing (ForceField)

Corbett Lunsford

Grace and Corbett show the latest development on their home build- the wall sheathing, which is also the air tightness layer and weather barrier. It's called ForceField, and here you'll see a demo of why it's such an important component in the system, and how to install it for a higher performance home.

More on ForceField at:

More on this build at:

5-Layer Slab for High Performance House

Corbett Lunsford

Home Diagnosis TV series co-host Corbett Lunsford shows the installation of the 5 layers of performance control under his family's new house. Thanks to Royal Building Products, Rockwool Insulation, Stego Industries, and the subcontractors who worked so hard to get this right! More at:

Kitchen Exhaust: #1 Tool to Control Your HOMEChem

Corbett Lunsford

Grace and Corbett Lunsford demonstrate the best way to design and select your kitchen exhaust system, using the #TinyLab's own Broan ventilation components. The ACE130SS range hood (new model BCSEK1SS) paired with the 8" Make-Up Air Unit means perfect control over the indoor environment, the chemistry, and the health of their family.

More resources and tools at:

The 4 P's to Solve Any Indoor Air Quality Problem

Corbett Lunsford

xEffortless Rocking means not trying to re-invent the wheel. Plenty of great home performance minds came before you, so take their ideas and make them your own. This one comes from Joe Lstiburek and John Straube at

5 Kinds of Ventilation for HOMEChem Control

Corbett Lunsford

Ventilation is simple in concept- it moves bad air out and good air in. But the applications can be intensely confusing- Grace and Corbett help peel the onion of controlling home performance dynamics (and the HOMEChem issues we're learning more and more about) using fans and controls available around the world.

Featured systems are AirCycler, Fantech, Broan-Nutone, RenewAire and Ultra-Aire.

More at:


Tiny House Plumbing Puzzle Took 2 Years to Solve

Grace McPhillips

The #TinyLab's plumbing system is highly efficient for water, electricity, and propane use, but it turns out that efficiency reduces the control over water temperature during different seasons. Corbett FINALLY solved the conundrum theoretically- but are the products available in the plumbing department going to perform as advertised?

How to Service, Disassemble, and Clean a Mitsubishi MSZ-FH06NA Ductless Minisplit

Corbett Lunsford

See a demonstration of taking apart and cleaning the Mitsubishi Electric FH-series ductless minisplit heat pump.  Thanks to Garrett Beneker of Lincoln Air in Phoenix, AZ for sharing his expertise, and to Jim Clark of Mitsubishi Electric Cooling & Heating for introducing us!

#TinyLab Airsealing Tape Technique Demonstration

Corbett Lunsford

If you want airtightness (and you DO), you want to use airsealing tape. Corbett demonstrates Tescon Vana tape application, thanks to 475 High Performance Building Supply for importing this stuff from Europe!


Corbett Lunsford

Our #TinyLab is a touring tiny house on wheels, which means it takes a lot of abuse as we travel the U.S. on the Proof Is Possible Tour. We’re teaching home performance, showing people how to get diagnostic proof when doing home improvements or building/buying a home.

One of the major problems in the home market is that people just don’t know what they don’t know. They don’t know that air leakage is the biggest problem in their homes, they don’t know that they’re making carbon monoxide every time they use a gas stove, and they don’t know that the formaldehyde in plywood is slowly poisoning their families. That’s what the tour is about.

Because we built the #TinyLab very airtight, almost every visible surface in our home is made of Purebond Formaldehyde-Free Plywood. We didn’t even waste time thinking about air purifiers or other band-aids; if we don’t want toxins in the house, it’s easier if we don’t bring them inside in the first place. We decided to use the Purebond for our Shoji Door to the bathroom, too- faster than using wood framing pieces, and going with a hardware-free sliding door would mean more durability overall. Here’s how the door was built:

1. Cut two sheets of Purebond ½” pre-finished plywood to size, with an extra ½” in each direction. Clamp them face-to-face. Measure and trace the cut-outs on the unfinished top side, putting the extra ½” along just two edges (i.e., bottom and right side) so that the other two edges are your reference 'finished' edges. You'll cut the extra ½” off after the door is assembled, to ensure a flat, straight edge on every side.

2. Cut the two sheets with a jigsaw to create the spaces for the rice paper, and any vents for pressure relief between rooms.

3. Dust the sheets off and stain the interior cuts you just made to match the veneer.

4. Prep your glue table with clamps- lots of them. Cut your rice paper to fit the full span of cut-outs with 1" to spare on each side.  Working fast but thoroughly, spread glue on the unfinished faces of both sheets simultaneously, and sandwich the rice paper between them.

5. Clamp the hell out of the assembled door, making sure the rice paper is taut, the cut-outs line up, and the two finished edges are even.

6. After letting the glue dry, unclamp the double-thickness door and cut the extra ½” away from the two edges, leaving all four edges perfectly even and smooth. Stain the outside edges to match the veneer.

7. Install the Shoji door in the jamb where it will slide (we used a pre-made sliding door frame, and removed the hardware and metal components for wheels) and seat it in a 1/16" waxed groove in the threshold. Attach adhesive felt strips to the pocket jamb to keep the veneer from being scratched.

8. Install the door and the jamb pieces that will lock in the top and closing side- DONE!