[Greenbuilding] Thermal envelope

[Lawrence Lile]

A friend of mine build a super insulated wall like this:

Post and beam, pole barn construction.  Standard out in the Ozark sticks where he lives - a hundred companies know how to build pole barns.  Metal pole barn roof.

The inside was stripped with 2X stock, as was the outside, of the poles.  Resultant wall is nearly a foot thick.

2X horizontal stripping occurs at the base, middle, and top of the wall.  Probably used just 2X6's for this, to give plenty of places to nail things.

Sheetrock runs vertically.

Behind cabinets, he added a layer of plywood to nail things to, then sheetrocked it.

Outside, vertical sheets of hardiboard siding.

Insulation was cellulose.

Exterior sheathing? Forget it.  The pole barn construction takes care of racking strength, just make sure there is a drainage plane.

It was a very cheap, foot thick, low-labor wall, for a small, inexpensive, and super-green house.

The boards were cut locally at a sawmill, probably green lumber also (which works if you know green lumber assembly techniques, or is a nightmare if you don't.

This mightwork for your horizontal stripping idea.



> -----Original Message-----
> From: greenbuilding-bounces at listserv.repp.org [mailto:greenbuilding-
> bounces at listserv.repp.org] On Behalf Of Russell, Richard
> Sent: Wednesday, April 23, 2008 2:24 PM
> To: Greenbuilding at listserv.repp.org
> Subject: Re: [Greenbuilding] Thermal envelope
>
> The wall with the horizontal 2x on the inside has been dubbed the
> "Mooney Wall." It has been discussed at length, with many pictures, on
> the Fine Homebuilding forum "Breaktime." It can be a good retrofit for
> an existing wall. While the thermal bridging through the wood isn't
> eliminated, it is reduced substantially. As I recall, the horizontal 2x
> material used in the project described was at least in part scrap from
> other parts of the project, thus reducing waste and therefore being
> rather green.
>
> The exterior curtain wall design is called the Larsen Truss, named for
> a
> Canadian who worked it up a few decades ago for retrofit of existing
> housing to superinsulated level. A modified Larsen truss, as
> implemented
> by Robert Riversong (Vermont), also is discussed at length over on
> Breaktime. His implementation provides a 12" exterior cavity (R40) for
> dense-packed cellulose.
>
> Dick Russell
>
> -----Original Message-----
> From: greenbuilding-bounces at listserv.repp.org
> [mailto:greenbuilding-bounces at listserv.repp.org] On Behalf Of Robert
> Tom
> Sent: Wednesday, April 23, 2008 2:56 PM
> To: 'GB REPP'
> Subject: [Greenbuilding] re: Thermal envelope
>
> ......
> Presumably the 1.5" x 2" "horizontal runners" will be ripped from 2x6
> or
> wider stock which needs to be a higher grade lumber (and hence larger
> and hence older trees) than 2x4 stud grade stock , with the attendant
> higher environmental impact, both of the ripping/waste of an already
> once-milled material and of the trees that went into that lumber.
>
> ......
> And to improve the overall R-value of the wall section, the 2x3 curtain
> wall could be spaced away from the 2x4 wall by any distance you desire,
> and the gap filled with an unbroken-by-framing layer of more
> insulation.
>
> The curtain wall can be framed at 24" centres if desired, since it's
> not
> loadbearing and it could be placed either on the interior or exterior
> of
> the 2x4 bearing wall.
>
> The advantage of placing it on the exterior is that it can be
> cantilevered out from the plane of the foundation, not consuming any
> interior floor space.
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