[GSBN] Wall Detail
Anni Tilt
anni at arkintilt.com
Mon May 21 16:58:42 UTC 2018
Hello Bohdan - good question!
Here are some thoughts off the top of my head
Improvements:
1) We designed the layout of the studs at 24” on center, into which an unmanipulated bale fits nicely. Despite a note on the plan, only about 1/3 of the bays are actually built this way. This added a lot of time in “ripping” the bales (and inventing the ripping jig). Approve a stud layout in advance?
2) We interrupted the bale wall at a few large window bays, and I wouldn’t do that again - the stopping and starting of details is more challenging than continuous details, even though it is more surface area.
3) The cap of the bales at the ceiling plane needed better attention (we added plywood), and ideally plaster, but it is a sequencing issue.
4) Getting the large volume of bales on the 2nd/3rd floor was a challenge- needs to be designed into the process!
5) The GRK screw with plywood strip attachment worked well, but they are expensive, and we would of course prefer to have a non-metal solution.
6) Plan better to get bales in earlier in the year - took the plaster forever to dry in the damp autumn of the Pacific Northwest.
7) Test density before purchasing bales - 2 string bales that were purchased (see #1 above) had to be rejected.
Good things:
1) Fire rating: thankfully, we have flame spread rating information (required for commercial buildings in the US) - attached below.
2) “Chair rail” for electrical/data runs and to prevent damage to the plaster from, um, chairs.
3) Clay paint finish in most offices was an important cost/time savings measure.
4) Having a expert straw-bale builder/ designer on the ground and part of the process was a god-send. Many thanks to Erica Ann Bush of One World Design, as well as the invaluable help of Jim Reiland of Many Hands Builders who helped lead the workshops.
best
Anni
Arkin Tilt Architects Ecological Planning & Design
1101 8th Street, #180
Berkeley, CA 94710
510.528.9830
510.528.0206 fax
www.arkintilt.com
> On May 20, 2018, at 6:35 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 <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 <http://www.arkintilt.com/>
>
>
>
> Detail of plaster in community room - the artistry of Erica Ann Bush
> <image001.jpg>
>
>
>
>
>
>
>> On May 18, 2018, at 9:56 AM, John Swearingen <jswearingen at skillful-means.com <mailto: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
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On Tue, May 15, 2018 at 6:02 PM Enga Lokey <enga at thelokeys.net <mailto: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 <mailto:enga at thelokeys.net>
>>>
>>>
>>>
>>>
>>>
>>>> On 15 May 2018, at 9:21 pm, Rene Dalmeijer <rdalmeij at mac.com <mailto: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 <mailto:rdalmeij at mac.com>
>>>>
>>>> IBAN NL09INGB0004388720
>>>> BIC INGBNL2A
>>>>
>>>>
>>>> On May14, 2018, at 18:42, David Arkin, AIA <david at arkintilt.com <mailto: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/ata-helps-host-casba-hybrid-straw-bale-workshop-our-mahonia-building-eugene-oregon>
>>>>
>>>> http://www.arkintilt.com/salvaged-materials-mahonia <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 <mailto: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/ <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 <http://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 <tel:(970)%20683-1517>
>>>> Lic. #9508518-5501
>>>>
>>>> Principal / Qualifying Builder
>>>> Community Rebuilds Moab -- http://www.communityrebuilds.org/ <http://www.communityrebuilds.org/>
>>>>
>>>>
>>>>
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>>>> --
>>>> Chris Magwood
>>>> Director, Endeavour Centre
>>>>
>>>> www.endeavourcentre.org <http://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# <tel:(510)%20528-9830>
>>>> www.arkintilt.com <http://www.arkintilt.com/>
>>>>
>>>> David Arkin, AIA, Architect
>>>> LEED Accredited Professional
>>>> CA #C22459/NV #5030
>>>>
>>>> Director, California Straw Building Association
>>>> www.strawbuilding.org <http://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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