straw bale presentasi english
TRANSCRIPT
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STRAW BALEAn introduction to low-impact building materials
M. KHABIB WAHUDI
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DEFINITIN
Straw is a renewable material o!ering goodt"ermal insulation properties and a muc"lower en#ironmental impact t"an man$current mainstream construction materials%
Straw bale is #er$ suitable as in&ll insulation'or timber'rame buildings wit" eit"er ane(ternal render or timber rainscreen &nis"%
Straw pro#ides a #apour-permeable wallconstruction using a locall$ sourced) low-impact material) alt"oug" it does need care'uldetailing and construction to a#oid t"e ingress
and retention o' moisture%
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*ISTR+
Straw "ouses "a#e been built on t"e A'ricanplains since t"e aleolit"ic Era%
Straw bales were used in construction ./ $earsago in 0erman$1
Straw-t"atc"ed roo's "a#e long been used innort"ern Europe and Asia%
In t"e New World) teepees were insulated inwinter wit" loose straw between t"e inner lining
and outer co#er% Since t"e .222s straw-bale construction "as
been substantiall$ re#i#ed) particularl$ in Nort"America) Europe) A'rica) and Australia%
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3*ARA3TERISTI3S
445 natural materials 6cradle to cradle concept7 *ig" insulation #alue - 8-#alue as low as 2)99 W:m.;
*ig" t"ermal mass
uic? assembl$ Eart"@ua?e resistant
Fire resistant up to 9.2min 6wit" applied cla$ plaster7
Eas$ to transport
All-$ear assembl$ possible ossible to appl$ cla$ plaster directl$ on t"e inside
straw sur'ace
Sa'e construction
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W*+ SE3IF+ STRAW BALE
Advantages A#oids t"ermal bridging and pro#ides good airtig"tness wit"
simple detailing
0ood insulation @ualities
Lig"tweig"t material wit" simple construction details and processes
Lig"t weig"t reduces load on 'oundations) reducing t"e need
'or materials wit" "ig" embodied energ$ 6eg concrete7
Low-cost renewable material) widel$ a#ailable 'rom local
sources) t"at stores carbon t"roug"out its li'e
Simple building s?ills suited to sel'-build and communit$
proCects
Suitable 'or in situ and pre'abricated approac"es
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Limitations
As an agricultural co-product) inconsistent properties6eg
dimensions) densit$ and moisture content7 can beproblematic
during construction
Details restricted b$ need to protect t"e straw 'rom
water ingress1 care'ul detailing needed 'or e(posed areas
Limited to relati#el$ lig"tweig"t &(ings
Limited water resilience 6gi#ing rise to concerns o#er
ood damage7 and problems 'or repair i' waterdamaged 6especiall$
loadbearing
walls7
Re@uires s"elter be'ore &nis"es can be applied
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STRAW BALE WALL 3NSTR83TIN SE>8EN3E
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S8R3ES F INFRATIN
BRE and 8ni#ersit$ o' Bat"% Low-impact materials case studies%
Straw-bale auction rooms% A#ailable at www%bre%co%u?:page%CspidG.//4% Dic? ; and ;ra"n T%
Straw bale building s$stem researc" and ongoing researc" at t"eAlternati#e