[GSBN] Wall Detail
Rene Dalmeijer
rdalmeij at mac.com
Mon May 21 19:11:12 UTC 2018
John,
..and others is there a perfect SB system?
As another John would say horses for courses. I firmly believe in this and therefore I do not advocate one SB building system.
I have used and experimented with various pre-fab SB wall systems and strongly concur with what John has to say a dry pre-fab system has much to commend it when dealing with more conventional builders/ building sites.
Basically I always say plaster a bale on the inner and outer surfaces for obvious reasons. But then I must confess to break my basic rule in the current build, no plaster at all. I hope to install the 185 bales for this project this coming weekend. This choice is based on the extreme time limitation of the project. We don’t have time for the plaster to dry. The bales will be tightly crammed in using a lever clamp to pre-compress the bales.
I would like to add that I have serious reservations about not plastering straw bales on the inside surface regarding fire and insulation performance. The furry straw bale surface pressing against multiplex/sheetrock/wood creates an air cavity degrading fire/insulation performance. When this cavity is on the outside its effect is much less damaging then when it is on the inside surface of the bale.
Basking in the reclaimed swamp at the mouth of the Rhine just on the verge of encasing bales in wooden boxes.
Rene Dalmeijer
> On Behalf Of Anni Tilt
> Sent: Monday, 21 May 2018 3:59 AM
> To: Global Straw Building Network
> Subject: Re: [GSBN] Wall Detail
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> Hello All
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> 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.
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> 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.
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> Was the system perfect? Hardly. Was it a worthwhile? I think so.
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> Anni “both/and” Tilt
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> Arkin Tilt Architects Ecological Planning & Design
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> 1101 8th Street, #180
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> Berkeley, CA 94710
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> 510.528.9830
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> 510.528.0206 fax
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> www.arkintilt.com
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> Detail of plaster in community room - the artistry of Erica Ann Bush
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> <image001.jpg>
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> On May 18, 2018, at 9:56 AM, John Swearingen <jswearingen at skillful-means.com> wrote:
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> 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".
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> 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.
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> 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.
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> 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.
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> John "Panelhead" Swearingen
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> On Tue, May 15, 2018 at 6:02 PM Enga Lokey <enga at thelokeys.net> wrote:
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> Hello you amazing builders/designers,
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> 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.
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> 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?
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> And as the saying goes, "just because I am confused does not mean you are incorrect."
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> Cheers,
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> Enga
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> enga at thelokeys.net
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> On 15 May 2018, at 9:21 pm, Rene Dalmeijer <rdalmeij at mac.com> wrote:
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> Doug,
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> 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.
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> 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.
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> Rene Dalmeijer Proces Advies
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> On May14, 2018, at 18:42, David Arkin, AIA <david at arkintilt.com> wrote:
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> Hello Doug:
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> 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.
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> http://www.arkintilt.com/ata-helps-host-casba-hybrid-straw-bale-workshop-our-mahonia-building-eugene-oregon
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> http://www.arkintilt.com/salvaged-materials-mahonia
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> 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).
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> 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.
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> This is not quite a ‘StrawCell’ as it doesn’t feature cellulose, but it could be appropriate to Delaware.
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> Looks like a great project,
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> David / ATA & CASBA
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> <2017-0224 YW2 bale corner detail2.jpg>
> <IMG_9936.JPG>
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> On May 14, 2018, at 8:47 AM, Chris Magwood <chris at endeavourcentre.org> wrote:
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> Hi Doug,
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> 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.
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> Cheers,
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> Chris
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> On 2018-05-14 11:03 AM, douglas nichols wrote:
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> Hello All
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> 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?
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> 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
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> Doug Nichols
>
> Creating Energy Efficient Homes Since 1995
>
> Nichols Contracting LLC
> 821 S. 400 E.
> Moab, Utah 84532
> Cell #970.683.1517
> Lic. #9508518-5501
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> Principal / Qualifying Builder
> Community Rebuilds Moab -- http://www.communityrebuilds.org/
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> Chris Magwood
> Director, Endeavour Centre
>
> www.endeavourcentre.org
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> * * * * *
> Arkin Tilt Architects
> Ecological Planning & Design
> 1101 8th St. #180, Berkeley, CA 94710
> 510/528-9830 ext. 2#
> 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
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