High Performance Wall Challenge: Double Stud Walls from Kolbert Building

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A little while ago, we told you about an Instagram challenge for the most high-performing wall that was practical to build.
We at ProTradeCraft decided to make animations of the four finalists.
This one comes from Ben Bogie, production manager, at Kolbert Building in Portland, Maine.
Ben’s wall begins with a foundation in the ground and some sort of floor. To keep it simple, we’re doing a slab on grade.
Kolbert Building uses the plastic under a slab to also isolate ther foundation from capillarity, but that’s a topic for another discussion.
They frame the outer wall like they would any other wall, except they use 2x4s.
Atop the wall a strip ofZIP System sheathing is nailed. This creates the perimeter air barrier strip.
Outside the wall, housewrap folds over that air barrier strip.
Roof framing sits atop the wall framing.
Now, they frame another wall inside the outer one. This wall has a single top plate, so it’s 1-½ inches shorter than the outer one. The ceiling air barrier sheathing is continued with the seams taped.
Crisscrossed 1x3 furring strips create a service cavity for running wires and PEX, if needed. They also eliminate truss uplift troubles and give drywallers a larger target for their screws.
The window openings are bridges with ¾ inch subfloor stips to provide a solid substrate for flashing the rough opening.
At the base of the wall outside, the sheathing is taped to the foundation for an air seal and the WRB overlaps the tape.
Furring strips go outside the WRB and a strip of cora-vent is installed at the base of them to keep bugs and other micro-varmits out.
Ben says that they install the WRB, split-release flashing tape, and cora vent before listing the wall to minimize ladder work.
Trim and siding go on just like a regular wall.
Baffles made from OSB and blocks are placed in each roof framing cavity to keep the THICK insulation where they want it.
Capping this highly insulated double stud wall.
There may be no R in wall, but there are more than 40 Rs in this assembly.

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You are a master of this illustrations.

DaveDugdaleColorado

This video just blew my mind. I'm building a shed and these concepts are so far beyond me that my brain just exploded. Somebody get ahold of Matt Risinger.

Also, nice sketchup work there.

DavinStewart

Would love to have these models published on the 3D warehouse. I'd happily model to your model format and help get a library of assemblies for different climate zones and building uses.

FrankReif

finally. the mouse resist wall. woohoo. kick ass

MrTooTechnical

Where do the framing nails go on the inside wall to keep it full supported while still decoupled??? There’s no nails on top plate or sides to keep the interior wall from wobbling

tatebraboy

I just designed a home with a superinsulated wall like this - R-40 walls and R-60 ceiling.

GeraldForsburg

What would you recommended for the connection to a stick framed vaulted roof? Air barrier on the underside still?

maxmoran

great explanation and graphics. An improvement would be a better thermal break at the attic floor.

unionseen

1) Thanks for the work, great vid!
2) Does the submitter also have perhaps a folder of jobsite photos or some assembly videos from one going up?
3) Is that big interstitial wall gap filled with a simple cellulose blown-in insulation like it looks in this illustration?
4) If that inner--stud wall does NOT attach or extend to the same height nor up to the truss, how do you hold it in place once plumb?

SandmanUSAFA

I see other videos where they have double wall construction and use 2x6 on both walls but that doesn't make any sense. The inside 2x4 exterior wall can be located at any distance needed for any insulation thickness. Double 2x6 walls are wasted money.

Nova-md

It would be nice to see this approach for 2-storey building.

samuraydesign

what holds the interior wall up, since its not attached to the roof, and that outer vapour barrier better be good, cause if it fails in the slightest... rot galore.

HotNoob

Do building codes in some jurisdictions allow an interior wall to not be connected to structure at the top?

nimblybimbly

You mention "truss uplift" in this video.
What exactly is this and how is it addressed before, during or after construction?
Like this style of presentation especially the drawings or illustrations.

dc-wpoc