[Strawbale] results of sb houses across europe pls

[Neale Brickwood]

Thanks derek. A bit more research on my part required then!!

Neale
Sent from my iPhone

On 11 Jul 2010, at 23:51, Derek Roff <derek at unm...> wrote:

> I agree with Dave, that plaster on bales is very important for the
> reasons mentioned.  I would add another major reason, and a couple of
> lesser reasons:
>
> -3- a well-bonded plaster-bale-plaster sandwich functions as a
> stressed-skin composite panel, significantly improving all of the
> wall's structural properties, especially shear, in-plane, and
> out-of-plane load bearing capacities.
>
> -4- plaster skins offer significantly more protection from mice,
> insects, and other critters, which can otherwise be smelly,
> destructive, and/or annoying.
>
> -5- sound insulation is dramatically increased.
>
> Derek
>
> --On Sunday, July 11, 2010 10:13 PM +0100 Dave Howorth
> <dave at howorth....uk> wrote:
>
> On Sat, 2010-07-10 at 22:35 +0000, Neale Brickwood wrote:
>
>> I'm thinking of a dry build using a timber frame to provide the
>> structure and dry enclosure with the straw being inserted from the
>> inside (in the dry) timber cladding outside, plasterboard inside. I
>> know it dosnt stack up with the purist principles but will provide
>> substantial Co2 savings by omitting brick, block and insulation and
>> obviously sand and cement.
>>
>>
>> I presume i'd need a breathable vapour barrier between the timber
>> structure and the cladding which would allow the straw to breathe.
> Do
>> you know if any one has done any U value calcs for this type of
> build
>> or do you forsee any problems?
>
> Neale,
>
> The term "breathable vapour barrier" is an oxymoron. Breathable means
> "vapour permeable". You probably mean a watertight, airtight barrier.
>
> Straw bales are traditionally coated with lime or clay plaster for two
> main reasons:
> -1- it provides fire resistance
> -2- it provides an airtight barrier that helps the straw function
> effectively as insulation
>
> Gaps between between bales and separate fireproof layers are known to
> act as chimneys in fires and these can increase the spread of flame.
>
> Having said all that, you might want to look at the S-House design.
>
> Cheers, Dave
>
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