[Strawbale] Green roofs on strawbale buildings

Brian Waite brian at brianwaite....uk
Fri Sep 17 21:24:57 CEST 2010

I like your illustrative style of explanation.
As an engineer I wouldn't consider load bearing strawbales because the 
thought of the loads being gradually transferred to the render skin goes 
against all my instincts. Anyone who has ever renovated an old house will 
have seen how crumbly lime plaster goes over time.
If I am going to devote the time, effort and money to building a home I want 
it to last for a few hundred years.
Besides all buildings need doors and windows and they have frames so it's 
little extra trouble to use them as part of the structure.
I have to admit I have gone a lot further down that path than most, in my 
strawbalehouse, but it is for a purpose.

----- Original Message ----- 
From: "RT" <ArchiLogic at yahoo...>
To: "Euro SB" <strawbale at amper....muni.cz>
Sent: Friday, September 17, 2010 4:38 PM
Subject: Re: [Strawbale] Green roofs on strawbale buildings

> On Thu, 16 Sep 2010 16:37:52 -0400, Dave Howorth <dave at howorth....uk>
> wrote:
>> On Thu, 2010-09-16 at 15:02 -0400, RT wrote:
>>> Perhaps it would be useful to mention that with load-bearing SB walls,
>>> it will ultimately be the plaster skins that take the gravity loads.
>>> As such, it's a matter of detailing the plaster properly to anticipate
>>> the intended design loading.
>> Would you mind providing a reference for that? I have no trouble
>> believing that the stiff plaster takes dynamic loads, but I don't see
>> why it would take the static loads, given precompressed bales and all
>> static loads applied before the plaster is applied. So experimental
>> evidence would be very valuable.
> Dave;
> Just curious as to how you think a SB wall assembly differentiates between
> the dead and live components of the gravity loads to which it must respond
> and then proceeds to direct the straw portion of the wall to deal with
> only the dead load component of the applied loads ?.
> (And I don't think it's reasonable to assume that all of the dead loads
> will be in place at the time of plastering. ie think of multiple storey
> structures as a "for instance")
> To anyone who has any doubts about the harder/stiffer elements taking the
> loads I would suggest a simple demonstration they can do on their own to
> confirm:
> Find a piece of deep pile broadloom or carpet and place a few small stones
> into the carpet in a manner that the carpet strands stand proud of the
> small stones.
> Then place a chair or ladder next to the piece of carpet, take off your
> shoes and socks and climb up and then jump onto the stone-studded carpet.
> When you recover, comment as to which element (hard stone (analagous to
> the plaster in a SB wall assembly) or the compressible carpet (analagous
> to the straw) took the load .
> As to official in-lab test data, any of the compression resistance tests
> done on plastered wall panels (in North America, Europe, AUS or NZ) will
> provide the same "evidence".
> Those same tests will also show the importance of proper detailing of the
> plaster to deal with the expected failure modes (ie Euler buckling,
> localised crushing, delamination etc.)
> -- 
> === * ===
> Rob Tom
> Kanata, Ontario, Canada
> < A r c h i L o g i c  at  Y a h o o  dot  c a >
> manually winnow the chaff from my edress if you hit "reply"
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