[GSBN] Wall Detail
Jacob Racusin
buildnatural at googlemail.com
Mon May 21 01:48:11 UTC 2018
Just to clarify our approach (again - cold wet northeastern US) - all bales
are fully sealed in base coat plaster, dense-pack cellulose-insulated stud
cavity, or air-tight sheathing, so assume total encapsulation for fire
control. Vented rainscreens do certainly carry a fire risk - ours is quite
limited here, and fire-prone areas tend not to need the extra moisture
durability provided by a rainscreen. We are careful to ensure that the wall
venting is fire-blocked/decoupled from any roof venting to prevent any
spread to the roof assembly in the event a fire does emerge in the cladding
- it would be isolated to the cladding, or at least that's the intent.
Jacob
On Sun, May 20, 2018 at 9:35 PM, Bohdan Dorniak <
bohdan at bdcoarchitects.com.au> wrote:
> Hi Anni
>
> What issues did you have – how would you perfect the system.
>
> Any issues with fire rating?
>
> Bohdan
>
>
>
> *From:* Gsbn [mailto:gsbn-bounces at sustainablesources.com] *On Behalf Of *Anni
> Tilt
> *Sent:* Monday, 21 May 2018 3:59 AM
> *To:* Global Straw Building Network
> *Subject:* Re: [GSBN] Wall Detail
>
>
>
> Hello All
>
>
>
> I wanted to weigh in on this discussion. We have used many different bale
> wall systems, trying to find the appropriate one for any given project.
>
>
>
> On this large commercial building in Oregon, using standard wood framing
> with bale and earth plaster on the interior allowed us to get a building
> permit with little fuss while having offices that can enjoy the benefits of
> a bale wall (insulation, thermal mass and all of the other wonderful
> hygrothermic properties of earth plaster, carbon sequestration, the
> integration of volunteer love, and the employment of a local earth
> plastering crew) in an office setting. We also didn’t have the challenge
> and expense of volunteers up on scaffolding on the exterior of the building
> for many months. It has gotten the entire community (including the
> permitting agencies! and the skeptical contractors! even the bank!) excited
> about straw bale, and the possibility of using it on a larger scale.
>
>
>
> Was the system perfect? Hardly. Was it a worthwhile? I think so.
>
>
>
> Anni “both/and” Tilt
>
> Arkin Tilt Architects Ecological Planning & Design
>
>
> 1101 8th Street, #180
>
>
> Berkeley, CA 94710
>
>
> 510.528.9830
>
>
> 510.528.0206 fax
>
>
> www.arkintilt.com
>
>
>
>
>
>
>
> Detail of plaster in community room - the artistry of Erica Ann Bush
>
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> On May 18, 2018, at 9:56 AM, John Swearingen <jswearingen at skillful-means.
> com> wrote:
>
>
>
> Enga, you've well expressed the contradictions inherent in blending
> strawbale, an efficient 'vernacular' system with conventional construction,
> a highly optimized 'industrial' system. Covering bales with cladding and
> fitting them to studs impedes the efficiency of wood framing and reduces
> the bale component to mere insulation, ignoring potential structural and
> architectural value. The principle advantage becomes that we've stuffed a
> fair amount of carbon into the walls and can call the building "green".
>
>
>
> Strawbale has an advantage over other vernacular methods in (1) its
> structural qualities as a ductile, load-bearing material that can take a
> variety of finishes that provide (2) thermal mass, combined with (3) high
> insulation. When structural requirements override what bales can provide,
> it often appears reasonable to install a discrete structural system.
> Economic constraints and the labor pool can then drive the search for
> readily accessible and efficient structural systems, such as conventional
> stud construction, something everybody knows how to do. The same
> considerations can carry over to the finish material, and thermal mass is
> sacrificed in order to use efficient and inexpensive sheet goods.
>
>
>
> There are some good reasons to do this--using simple frame construction
> allows people to easily find conventional builders to build their dream.
> Sheet cladding is attractive in areas where render is uncommon and may be
> expensive. We learned early on that it was easier to adapt our bales to the
> framing than to frustrate framers by making them work around the bales.
>
>
>
> A major cost of bale construction comes in the installation and
> preparation of the bales, particularly around fenestration. This is often
> discounted because of volunteer labor, but to make bale construction more
> widely available we've concentrated efforts on improving that aspect of
> construction, using pre-assembled panels that deliver bales efficiently and
> still provide structural capability. A standardized panel makes bales more
> acceptable to mainstream builders, and shop-built panels that contain
> windows and doors improve qualitiy and lower costs. Separating fenestration
> from bales into conventionally framed sections, and allows us to use
> assemblies that were designed for conventional construction without
> modification--and lets bales be bales.
>
>
>
> John "Panelhead" Swearingen
>
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> On Tue, May 15, 2018 at 6:02 PM Enga Lokey <enga at thelokeys.net> wrote:
>
>
> Hello you amazing builders/designers,
>
>
>
> At the risk of being chucked off the list for this question, I would like
> to play devil’s advocate here and ask what is being achieved by the use of
> strawbales in the methods discussed below and others that seem to be the
> direction that strawbale is moving (i.e. building wrap, 2x6 framing on 24in
> centers, external timber sheathing, etc). More specifically, it appears
> that the building methods are being adjusted toward a more standard
> construction to the point of wondering why the strawbale is even still
> used? There are other cellulose based products and other more natural or
> healthy insulation products on the market.
>
>
>
> We are all aware of the challenges of working with straw and thus there
> needs to be, in balance, a greater benefit in order to justify. Is that
> benefit still there when used in this way? Are we not using equal/more
> other materials in order to build with straw in these methods? Is it
> justified?
>
>
>
> And as the saying goes, "just because I am confused does not mean you are
> incorrect."
>
>
>
> Cheers,
>
> Enga
>
>
>
>
>
>
>
> enga at thelokeys.net
>
>
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>
> On 15 May 2018, at 9:21 pm, Rene Dalmeijer <rdalmeij at mac.com> wrote:
>
>
>
> Doug,
>
> I did a pre-fab 5 story SB build akin to the system used by David in 2007.
> The difference being we used Fermacell with breathable housewrap on the
> outside clad with open horizontal larch cladding. This has been performing
> very well even though there have been some leeks due to caulking problems
> in the window frames, No mushy bales.
>
> This has become my preferred Pre-fab SB method. Although I am now involved
> in a pre-fab build without any earth plaster on the bales at all, shudder!
> The bales will vertically stacked in prefab elements with underlayment
> inner and outer skins with wooden vertical slab siding.
>
>
> Rene Dalmeijer Proces Advies
> Thomas Hoodstraat 2
> 1086 WE Amsterdam
>
> 06 48955419
>
> KvK 34243755
> BTW NL057444146B01
> NL18ASNB0932817343
> new email rdalmeij at mac.com
>
> IBAN NL09INGB0004388720
> BIC INGBNL2A
>
>
> On May14, 2018, at 18:42, David Arkin, AIA <david at arkintilt.com> wrote:
>
> Hello Doug:
>
> We completed a recent project using a ‘Hybrid Wall System’, employing
> typical 2x6 studs at 24” on center with plywood sheathing (note - plywood,
> not OSB - but in a non-seismic zone wood fiberboard or similar may
> suffice), and then installed the bales as insulation on-end between the
> studs, using clay plaster on the interior and a typical weather-barrier and
> cladding finish on the exterior. Attached is an illustration of the
> system, and here are links to the workshop and the finished building, a
> 34,000 mixed use office and warehouse in Eugene, Oregon.
>
> http://www.arkintilt.com/ata-helps-host-casba-hybrid-straw-
> bale-workshop-our-mahonia-building-eugene-oregon
>
> http://www.arkintilt.com/salvaged-materials-mahonia
>
> Also attached is a picture of the wall under construction. We used
> 3-string rye bales and held them tight to the plywood with 4” wide strips
> of 1/2” plywood, and 12” Timber-Hex screws into the studs (we'll use 14”
> screws next time - easier to find the studs, and a better connection).
>
> I also have the WUFI analysis our building efficiency consultant ran for
> various locations - they can run a weather file specific to Wilmington if
> you wish. LMK.
>
> This is not quite a ‘StrawCell’ as it doesn’t feature cellulose, but it
> could be appropriate to Delaware.
>
> Looks like a great project,
>
> David / ATA & CASBA
>
> <2017-0224 YW2 bale corner detail2.jpg>
> <IMG_9936.JPG>
>
> On May 14, 2018, at 8:47 AM, Chris Magwood <chris at endeavourcentre.org>
> wrote:
>
> Hi Doug,
>
> Here's a detail from our last straw-cell project. Hope it's helpful to
> you. You can contact me off list if you want to discuss it.
>
> Cheers,
>
> Chris
>
> On 2018-05-14 11:03 AM, douglas nichols wrote:
>
> Hello All
>
> I'm consulting with a non-profit (http://www.yinnovations.org/) to build
> an affordable straw home for a low income family. Their current
> engineering was provided by someone unfamiliar with straw bale building and
> is coming up pretty short of being a low carbon, sustainable, or natural
> design. So we are moving to a straw cell design to help ease any
> engineering and building official concerns about the straw bale part. My
> question is-- does anyone have a good straw cell wall detail drawing they
> can point me to or donate to the effort?
>
> Y Innovations, Inc.
> www.yinnovations.org
> 2903 North Jefferson Street 2903 North Jefferson Street is a 4500 square
> foot vacant lot in the city of Wilmington, where Y Innovations will be
> completing a 630 square foot naturally-built straw bale home in 2018.
> Thanks
>
> Doug Nichols
>
> Creating Energy Efficient Homes Since 1995
>
> Nichols Contracting LLC
> 821 S. 400 E.
> Moab, Utah 84532
> Cell #970.683.1517 <(970)%20683-1517>
> Lic. #9508518-5501
>
> Principal / Qualifying Builder
> Community Rebuilds Moab -- http://www.communityrebuilds.org/
>
>
>
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>
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>
>
> --
> Chris Magwood
> Director, Endeavour Centre
>
> www.endeavourcentre.org
> <Screen Shot 2018-05-14 at 11.29.45 AM.png>_______________________
> ________________________
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>
>
>
> * * * * *
> Arkin Tilt Architects
> Ecological Planning & Design
> 1101 8th St. #180, Berkeley, CA 94710
> 510/528-9830 ext. 2# <(510)%20528-9830>
> www.arkintilt.com
>
> David Arkin, AIA, Architect
> LEED Accredited Professional
> CA #C22459/NV #5030
>
> Director, California Straw Building Association
> www.strawbuilding.org
> CASBA is a project of the Tides Center
>
> "There is no way to peace. Peace is the way."
> — A. J. Muste
>
>
>
>
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--
Jacob Deva Racusin
Co-Owner
New Frameworks Natural Design/Build
1 Mill St., Ste. 161
Burlington, VT 05401
(802) 782-7783
jacob at newframeworks.com
www.newframeworks.com
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