[GSBN] prefab strawbale

Andy Horn andy at ecodesignarchitects.co.za
Wed Sep 30 02:03:29 CDT 2009


Hi Caroline

Thanks, a bit crudely executed by builder, but was a fun project in a quaint
country village Barrydale with client, friends and community all getting
involved.   

 

Have not worked there yet, but no the .za is for South Africa. Based in Cape
Town, most of my work is in the Western Cape, though ver the country and
have done a little bit of work in Zambia
.though that was not strawbale.

 

We do a lot of work where we are trying to use more labor on site. Here
labor is cheap and we face unemployment issues so I have looked to find a
way of building that cuts out our reliance on machines as far as practically
possible. With plastering we have an established hand plastering trade so I
make use of that. While there are people who use gunite equipment, this is a
very specialized industry that has developed for swimming pool construction
not wall plastering. 

 

I only know of 1 South African straw bale project that used gunite
techniques. The result looked ok, but not so solid
.i.e. if you tap on the
walls they sound hollow, while with the dipping the walls sound solid. Also
was not so fond of the idea of having to tape up all the window and door
frames with plastic creating more waste so as to mask them from plaster
spray. Have you found ways of getting around this?

 

Kind regards 

Andy

  _____  

From: GSBN-bounces at greenbuilder.com [mailto:GSBN-bounces at greenbuilder.com]
On Behalf Of caroline meyer white
Sent: 19 September 2009 03:02 PM
To: with public archives) Global Straw Building Network(private
Subject: Re: [GSBN] prefab strawbale

 


Hi Andy!

Thanks for the comment and the link, nice building. I've done dipping the
bales for a project as well. The houses that we mainly build in Denmark now,
are jumbobale loadbearing houses, with NO wood in the walls, and walls
plaster-sprayed in the first one or sometimes 2 coats, the spraying makes
the dipping unnessecary. 
Do you work in Zimbabwe? The .za at the end of the web address?

Cheer Caroline

Caroline Meyer White 

Friland 23 
8410 Rønde 
tlf + 45 40 76 1980 

New email which I am changing to: hojtpaastraa at gmail.com 

Kender du: engodsag.dk ? 

Eller paksbab.org ?

--- On Wed, 9/16/09, Andy Horn <andy at ecodesignarchitects.co.za> wrote:


From: Andy Horn <andy at ecodesignarchitects.co.za>
Subject: Re: [GSBN] prefab strawbale
To: "'(private, with public archives) Global Straw Building Network'"
<GSBN at greenbuilder.com>
Date: Wednesday, September 16, 2009, 4:30 AM

Hi Caroline

A modification of a prefabricated system but which effectively cuts out a
lot of time with the plastering and is kind of related to “prefab” is to
look at bale dipping

this involves fitting bales between frames and then
disassembling the wall sequentially, then dipping the exposed surfaces of
the bales in a watery mix of earth (yogurt consistency)  and working the
earth into the straw while laid flat in a bath or trough. The bales are then
left in the sun to dry until they become are of cob like consistency before
raising them back into position. You can find some good pictures of the
system on our web site. Our most recent Straw bale project can be found
under
<http://www.ecodesignarchitects.co.za/eco/index.php?option=com_gallery2&Item
id=44&g2_itemId=2406>
http://www.ecodesignarchitects.co.za/eco/index.php?option=com_gallery2&Itemi
d=44&g2_itemId=2406

 

I have found this to be a highly effective way of building that combines
some of the advantages of the pre-fab systems (ease of applying initial
plaster coat) with the advantages of onsite assembly. While it does not save
on timber, it does not need heavy duty machinery to erect with cranes etc
and generally having a frame in place is easier for municipalities and
conventional builders to get their heads around. I have been using this
system for about 5 or 6 years now.

 

Kind regards 

 

Andy Horn

 

ECO DESIGN - Architects & Consultants

6th Floor, 79 Roeland St .

Cape Town, 8001

South Africa

Tel: 0721 4621614 Fax: 07 21 461 3198

www.ecodesignarchitects.co.za

 

  _____  

From: GSBN-bounces at greenbuilder.com [mailto:GSBN-bounces at greenbuilder.com]
On Behalf Of caroline meyer white
Sent: 14 September 2009 12:44 PM
To: with public archives) Global Straw Building Network(private
Subject: Re: [GSBN] prefab strawbale

 


Hi Derek, 

 

Thanks for your reply.

What I, in an affaul lot of words, is trying to say, is that I think we need
prefab elements, be it Modcell or any other. And I personally think that if
e.g. what we would consider a large amount of wood in the frame or some
other sort of compromise, is what you have to do, to make it easy for a
conventional contracter to choose your panel, then I can live with that
compromise. Because the general carbon footprint, or which ever method we
choose to measure with, will still be fare better then any other mainstream
alternative that I at least know of.

So my inquirries were mainly to say that I don't think it is right to
compare these panels - be it Modcell or any other, with loadbearing
balehouses, because they have the potentiel to reach a market that we
unfortunately don't seem to be able to reach with the more specific
balehouse techniques.

 

Secondly some of the discussion on the list seemed to not take in the
information actually given on Modcells website. Such as the local assembling
of the panels - Of course on site assembling is great, but if the panels are
assembled at the barn where the straw is sitting anyway, there isn't really
any additional transportation involved.

They have the "lite" panels, where the frame is 50 mm but with 2 I-beam
wooden posts inside the panel, a light osb I-beam I think. That helps a bit
on the amount of wood and I am curios why the are not all done like that.

 

My curiosity in this prefab thing has leed me to having just arrived in Bath
to do my 5th semester engineering internship, I will be following a research
project on the Balehouse, where some of all of these issues will be
adressed. When I first saw the panels I had all the same reservations as
expressed on this list, and I still do! I am very keen to get a look at the
need for that heavy wood frame, to find a design where local wood can be
used, to encourage testing and considering earthern plasters in locations
where that will be sufficient. To find better ways of assembling the panels
etc. 

So I am all with you, and in the end, we are a few people hoping to set up
something as appropriate as can be, in Denmark. So I was very excited about
the discussion on the list, and a bit dissapointed that it kept coming back
to this comparison of systems that don't do the same.. I like the lighter
versions of panels that Chris talked about, I just find it important to have
the whole specter and accept that oned of it, which will be most "normal"
may need compromises.

I think it is as Bruce mentioned earlier, that these guys are really open to
suggestions, and still ongoing with lots of testing. Any good suggestions
that are shared I am sure will be taken in account. I am told that the
engineers involved are very conservative (not a surprice), and probably some
convincing strength on bales could be really helpfull, in order to help them
to calculate the bales into the system.

 

When there is more to share from over here I will be very happy to do so.
And I am obviously keen to get more details on the other pre fab systems
that you or anybody else knows about.

Cheers
Caroline 

 

Kender du: engodsag.dk ? 

Eller paksbab.org ?

--- On Fri, 9/11/09, Derek Roff <derek at unm.edu> wrote:


From: Derek Roff <derek at unm.edu>
Subject: Re: [GSBN] prefab strawbale
To: "Global Straw Building Network" <GSBN at greenbuilder.com>
Date: Friday, September 11, 2009, 3:58 PM

Thanks for your comments, Caroline.  I am very interested in strawbale 
panels, and in finding ways to increase the use of bales in all kinds 
of construction.  I agree with you, that we will need to find more 
industrial bale building methods, if we are to interest certain 
segments of the building industry.

A different question is comparing the specific Modcell prefab panel 
method/technology/approach to what other companies are doing, using 
different prefab panel methods.  I've seen buildings and building 
methods using factory assembled stawbale panels that I like better.  Of 
course, what I have seen and read cannot equate to a rigorous, 
scientific comparison, but I think that there are prefab panel 
approaches in use in Switzerland , Austria , Canada , and probably other 
places, that look more promising to me than Modcell.

Caroline, are you saying that you think Modcell is the best prefab 
method available, or that we need an industrial prefab method, such as 
Modcell or something like it?

Best wishes,

Derek

--On Friday, September 11, 2009 9:27 AM -0700 caroline meyer white 
< <http://us.mc321.mail.yahoo.com/mc/compose?to=fredmeyer8@yahoo.com>
fredmeyer8 at yahoo.com> wrote:

> Dear All,
>
> Knowing that I am very late in this respons, I feel like I should
> make it anyway.
> In Denmark for some time, we have had an ungoing discussion on, how
> to make strawbale construction breaking through. Because, there is no
> doubt, the load bearing houses, build in lovely parties,
> strenghtening community etc, well you can't do better then that, when
> you want to see environment and livelyhoods flourish.
> But how much of the market do we reach? I am affraid that I have lost
> the belief in, that we will get to have a very big market share using
> the different bale techniques that are out there. At least in
> Denmark , no construction worker - be it trained in carpentry, masonry
> or simular trades touch bale construction. It is to fare from what
> they have learned. And then not to talk about more industrialized
> buildings, not just thinking of residential homes.
>
> SO..I think Modcell is the best suggestion out there to break the
> market. We have the absolutely more appropriate solutions for the
> people who will engage them selves in building their homes, be it in
> Europe/US or any where on the planet, where you always build your
> home your self. But if we want to change some carbon footprint, it's
> the heavy guys we need to reach, and then be there a lot of wood in
> the structure or not. - With the Modcell nobody needs to care about
> that it's straw thats inside it, once it reaches the building site.
> And that may be what makes it duable for the conventional market. -
> Allowing straw to become an insulation material like any other, not a
> hippie-style of construction, which is the impression that any
> conventional builder has about the way I have at least build all my
> houses.
>
> Considering the transportation, I just want to mention, if you
> haden't seen on the web site, that they construct the panels always
> in a local barn, so transportation is never more then a few miles
> with the completed panels and only the woodframes are coming in from
> a fare.
>
> So having defended this, I agree that their may be ways of
> improvement, which Modcell themselves are working on as well. My
> point is just, that this alternative potentially can reach a market
> that we (being all us balers) can't reach. And which may in the end
> have a very large impact on our beautiful planet.
>
> All the best
> Caroline
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> From: Brian <
<http://us.mc321.mail.yahoo.com/mc/compose?to=brian@anvill.com.au>
brian at anvill.com.au>
> Subject: Re: [GSBN] prefab strawbale
> To: "'(private, with public archives) Global Straw Building Network'"
> < <http://us.mc321.mail.yahoo.com/mc/compose?to=GSBN@greenbuilder.com>
GSBN at greenbuilder.com>
> Date: Sunday, August 2, 2009, 5:24 PM
>
>
> Hi All,
> I have been interested in prefab wall panels for some time, but have
> difficulty finding the appropriate time and skill savings. My son
> Brad has a
> render pump that will pump up to 60 square meters an hour at 20mm
> thick. He
> works with the owners and their volunteers to keep their costs down.
> It is
> often necessary to have two mixers to keep up with the machine, but
> at 1
> square meter per minute it is pretty quick.
>
> Regards
>
> Brian
> Anvill
> -----Original Message-----
> From:
<http://us.mc321.mail.yahoo.com/mc/compose?to=GSBN-bounces@greenbuilder.com>
GSBN-bounces at greenbuilder.com
> [mailto:
<http://us.mc321.mail.yahoo.com/mc/compose?to=GSBN-bounces@greenbuilder.com>
GSBN-bounces at greenbuilder.com]
> On Behalf Of
<http://us.mc321.mail.yahoo.com/mc/compose?to=cmagwood@kos.net>
cmagwood at kos.net
> Sent: Friday, 31 July 2009 8:40 PM
> To: private, with public archives) Global Straw Building Networ
> Subject: Re: [GSBN] prefab strawbale
>
> John,
>
> Most of the cost and time savings with the prefab panels we're doing
> come
> from eliminating the site plastering. The poured walls are done in a
> single coat, poured "sidewalk style", both sides of the panel at one
> time.
> There is no way even our best practiced spray crew could do two coats
> to
> two sides to a perfect finish in under an hour for an 8ftx8ft panel.
> Plus,
> the plaster can be applied in any weather and can cure away from sun,
> wind
> and gravity pulling things down the wall.
>
> After lots of experiments, we decided not to cast door and windows
> into
> the panels. Instead, we panelize the sections of the building between
> openings, and then frame in the openings once the panels are
> installed. In
> the case of the building we just did, those sections don't have any
> bale
> in them. Instead, we framed out storage bins/benches at the same
> width as
> the bale walls.
>
> We include a single stud at the edge of each panel, and the framed
> sections are attached to these studs. I can send you the plan details
> if
> you want. We typically don't meet shaky California criteria here in
> Ontario , but I'm sure the system can be adapted to suit.
>
> Chris
>
>> That's interesting info, Chris, particularly your construction costs.
>> Maybe
>> we should try something like that!
>>
>> I'm not clear how, with a module that's pre-plastered, you tie
>> modules together and make them weather-tight as well as structurally
>> sound (don't forget, our ground shakes violently now and then).
>>
>> It seems that your 'poured' walls are simple and easy for unskilled
>> builders.   What would be the difference if you installed pre-fab
>> walls w/o
>> plaster, and a professional crew did the plastering as normally done?
>>
>> John "Beyond Fab" Swearingen
>>
>
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Derek Roff
Language Learning Center
Ortega Hall 129, MSC03-2100
University of New Mexico
Albuquerque , NM 87131-0001
505/277-7368, fax 505/277-3885
Internet:  <http://us.mc321.mail.yahoo.com/mc/compose?to=derek@unm.edu>
derek at unm.edu

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