Passive House video — Episode 4

In “Framing for Efficiency,” the fourth episode in a series of videos on Passivhaus construction, the framing crew erects double-stud walls

Watch the video

Produced by: Colin Russell and Justin Fink

READ THE ARTICLE

Framing for Efficiency. Architect Steve Baczek explains how he designed the framing for a house that needed to meet the Passivhaus airtightness standard of 0.6 ach50. He describes four elements of the framing: raised-heel roof trusses, which provided a quick way to hang and finish the ceiling air barrierBuilding assembly components that work as a system to restrict air flow through the building envelope. Air barriers may or may not act as a vapor barrier. The air barrier can be on the exterior, the interior of the assembly, or both. before partition walls were built; the floor trusses, which allowed for easy running of mechanicals between the first and second floors; and the interior and exterior frames, which comprise the R-52 double-stud wallConstruction system in which two layers of studs are used to provide a thicker-than-normal wall system so that a lot of insulation can be installed; the two walls are often separated by several inches to reduce thermal bridging through the studs and to provide additional space for insulation. system.

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Passive House video — Episode 1

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Podcast: Passivhaus, Part 1

The frame of a Passivhaus may not be as exciting as the thick layers of insulation, the high-tech mechanical ­systems, or the triple-glazed windows, but it plays a very important supporting role in achieving success. Every component of the framing package in this house was chosen with care and for a specific reason. The exterior Zip System sheathingMaterial, usually plywood or oriented strand board (OSB), but sometimes wooden boards, installed on the exterior of wall studs, rafters, or roof trusses; siding or roofing installed on the sheathing—sometimes over strapping to create a rainscreen. provides airtightness, the double-stud walls and raised-heel roof trusses are a cost-effective means of supporting or containing above-average levels of insulation, and the open-web floor trusses easily span the open floor plan and provide plenty of room for the many ducts necessary for the Zehnder ventilation system and supporting mechanicals.

Watch the video above; read the companion Fine Homebuilding article at right; and then join the conversation with the designer of this house, Architect Steve Baczek.

Over the course of the next several months — as each new issue of Fine Homebuilding magazine is released — this collection of articles and videos will cover:

Passive House design
Airtight mudsills
Superinsulated slab
Framing for Efficiency
Windows and doors

To watch Episode 1 of this video series, click here.

To watch Episode 2 of this video series, click here.

To watch Episode 3 of this video series, click here.

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1.
Nov 28, 2013 12:17 PM ET

blower door tests
by Christopher Vlcek, Littlewolf Architecture

Could you summarize the specifics for the blower door tests at each stage, say:

test 1- primary air barrier:
acoustic sealant @ framing, exterior sheathing w/ tape, over windows, GWB ceiling, ACH50- value?
test 2- secondary air barrier:
same with 4" closed cell at walls and top plate flange, ACH50- value?

... and the next 2 tests when you get there... thanks-


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