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Re: GSBN:Fwd: CASBA_ Pea Gravel
<In the instance of a washing machine overflow, I doubt that 1" of gravel
would be sufficient to prevent the water traveling into the bottom of the
We also use plates that are about 3.5", so the gravel layer would be at 2.5"
and the BB's (bale bottoms) would be at 3.5". That seems sufficient to
handle most overflow situations.
One alternative, if interior flooding is a big concern, would be to break
the insulation every foot or two with a 2" channel of gravel perpendicular
to the length of the wall. These could even lead to a rainwater collection
tank so that you can recycle your overflowing water.
One translation question....what's "Bulk insulation"
John "What are those suds on the Floor?" Swearingen
On Dec 13, 2007 12:18 AM, Brian Hodge brian@... wrote:
> Hi David & Anni,
> I agree with you. If there is water in the bales to the point that
> at the bottom is required, I would recommend their removal. For 5 years we
> have been using a 90mm deep bottom boxing with the cavity filled with Bulk
> insulation to avoid a thermal bridge. The top of the bottom boxing is then
> covered with structural ply.
> The main reason that we have the 90 mm (4") bottom boxing is in the case
> an internal spill such as a washing machine or bath overflow. We use a
> polyester strap with 1,100 kg breaking strain to compress the bales. This
> strapping is fitted under the bottom boxing, so the bottom boxing also
> with compression.
> In the instance of a washing machine overflow, I doubt that 1" of gravel
> would be sufficient to prevent the water traveling into the bottom of the
> Brian Hodge
> Anvil Straw
> ----- Original Message -----
> From: "Catherine Wanek" cat@...
> To: GSBN@...
> Sent: Wednesday, December 12, 2007 2:18 PM
> Subject: GSBN:Fwd: CASBA_ Pea Gravel
> I am forwarding this inquiry from the California
> Straw Building Association (CASBA) list from
> award-winning architects David Arkin & Anni
> Tilt. Perhaps this will stimulate discussion on the GSBN e-waves.
> >From: "David Arkin, AIA" david@...
> >Date: Tue, 11 Dec 2007 17:21:39 -0800
> >Subject: CASBA_Mem Pea Gravel
> >Fellow CASBAnauts (CASBAnuts?):
> >We haven't used pea gravel between our sill plates for some time now,
> >rigid insulation instead. My opinion is that if a bale wall has enough
> >water in it to need 'drainage' (from any source), those bales are goners.
> >The building official in Sonoma is citing it's recommendation in SB332 as
> >good enough reason to require that it be there. SB332 says, "There shall
> >also be a drainage plane between the straw and the top of the foundation,
> >such as a one inch layer of pea gravel." Does anyone know of the intent
> >More importantly, does anyone know of any testing as to why this might
> >might not) be a good idea?
> >Your thoughts (and/or Holiday Greetings) always appreciated,
> >David and Anni
> >* * * * *
> >Arkin Tilt Architects
> >Ecological Planning & Design
> >David Arkin, AIA, Architect
> >LEED Accredited Professional
> >CA #C22459/NV #5030
> >1101 8th St. #180, Berkeley, CA 94710
> >"There is no way to peace. Peace is the way."
> >- A. J. Muste
> >Use REPLY to respond to the sender only or
> >use REPLY ALL to respond to the entire list.
> >CASBA Website can be found at <a target="_blank" href="http://www.strawbuilding.org">http://www.strawbuilding.org</a>
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Skillful Means, Inc.
Design and Construction
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