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Re: GSBN:Moisture Thesis for download



Thanks for sharing this research/thesis with us Kuba. I'll correspond with
you off the GSBN about it soon.

Joyce

on 10.5.2007 5:38 AM, Jakub Wihan at kuba@...:

> Dear Joyce and others,
>
> Reading about Jims moisture research, I'd like to offer everybody an
> opportunity to download the thesis "Humidity in straw bale walls and its
> effect on the decomposition of straw", that was finished in July.
>
> <a  target="_blank" href="http://www.jakubwihan.com/pdf/thesis.pdf";>http://www.jakubwihan.com/pdf/thesis.pdf</a>
>
>
> Yet another study material for your phd, Jim. Good luck and I'll be looking
> forward hearing about your work some more.
>
> I would like to thank everybody on GSBN for their insights and especially
> to many of you who directly supported this study.
>
> Love
>
> Kuba
>
>
>
> ----- Original Message -----
> From: "Jim Carfrae" jim.carfrae@...
> To: "GSBN" GSBN@...
> Sent: Friday, October 05, 2007 9:15 AM
> Subject: RE: GSBN:Re: Strawbale walling query
>
>
> Hello Tom (and all)
>
> This is my first response, so please excuse any errors in protocol!
>
> We built our SB house almost exactly as described, and the details we
> employed were as follows;
>
> We fixed a strip of Fermcell (plaster board) to the back of the internal
> post that extended an inch or so either side, to allow a continuous
> plaster/vapour check with the internal render - you will get shrinkage of
> large section posts, and if we hadn't done this there would be an eighth
> inch air gap each side of the post.
>
> We then fixed a fencing staple to the back of the post and used it to hold
> the bales in place with poly packaging strapping (the sort that comes with a
> tensioning device - very handy in a lot of SB building scenarios)
> This was done not so much for structural reasons, as to help keep the walls
> straight and true but retain flexibility.
>
> Without seeing the details, I am confused as to why there is a wall plate to
> tie to the rafters - in our post and beam, the wall plate is the top of the
> frame, the rafters sit on that, and the SB wall extends up between the
> rafters.
>
> We have been monitoring our house with about 30 moisture sensors for about
> two years, and I would advocate a rainscreen. We are in a similar gulf
> stream climate, and the walls that are just lime rendered hold on average 3%
> more moisture than the screened ones (av. 13% against 16%)
>
> I would also agree that the SB wall should wrap around the outside of the
> posts, not between - far simpler to build, and better continuous insulation.
>
> Jim Carfrae
> PhD Research Student
>
> Room 119, Reynolds Building
> University of Plymouth
> Drake Circus
> Plymouth
> PL4 8AA
>
> jim.carfrae@...
> 07880 551922
> 01803 862369
> ________________________________________
> From: GSBN [GSBN@...] On Behalf Of Tom Woolley
> [woolley.tom@virgin.net]
> Sent: 04 October 2007 18:06
> To: GSBN
> Subject: GSBN:Re: Strawbale walling query
>
> I had a meeting today with a young Belfast architect, Siobhan Brown,
> who is designing a strawbale house for a self builder in County
> Fermanagh ~Northern Ireland
>
> I don't think Siobhan has much experience of SB but she has had a
> good go at the design mainly based on details in a book by Chris Magwood
>
> The client wants to built a post and beam structure for the house and
> then wrap the strawbale walls around the outside of the posts.
> She was not proposing to tie the walls into the posts as she says
> that Magwood's details do not show this.
> She was planing to tie the wall plate to the rafters of the roof. The
> house is single storey but with rooms in the loft. so the floor
> joists for the upper floor will be part of the roof structure.
>
> I have misgivings about this . I wonder if anyone has built a
> strawbale house where the bale walls are not load bearing and are
> wrapped around the outside of the structural posts without being tied
> into them? The posts will be about 4 metres apart.
>
> Fermanagh has to have 100% humidity all year round with a lot of
> heavy winds and driving rain. If you stand still for 5 minutes moss
> will grow on your head.  I also think the walls will need a rain screen
>
> I would have thought a more solid structure would involve placing
> sections of bale walls between the posts and being tied into them
>
> Any useful comments and I will pass them onto Siobhan
>
> thanks
>
>
> Tom Woolley
> woolley.tom@...
> Rachel Bevan Architects
> 17A Main Street
> Saintfield
> Ballynahinch
> County Down
> BT24 7AA
> 028 97 512851
>
> also:
> Graduate School of the Environment
> Centre for Alternative Technology
> Unit 7, Dyfi Eco Parc
> Machynlleth
> Powys, SY208AX
>
> 01654 703562
>
>
>
>
>
>
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