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Straw Bale SIP

The document discusses the potential for natural building materials like straw bales to be used in New Zealand's conventional housing market. It notes that the construction industry has a large environmental impact and that natural materials could help improve sustainability. The document then outlines various natural building projects in New Zealand and provides details on the history and construction process of straw bale homes. It also discusses the benefits of a prefabricated straw bale panel system being developed, including reduced costs, improved quality control, and shorter construction times. The authors conclude there is interest in natural building but that standardizing panel sizes and refining finishing techniques off-site are needed to better integrate natural materials into mainstream construction.

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490 views26 pages

Straw Bale SIP

The document discusses the potential for natural building materials like straw bales to be used in New Zealand's conventional housing market. It notes that the construction industry has a large environmental impact and that natural materials could help improve sustainability. The document then outlines various natural building projects in New Zealand and provides details on the history and construction process of straw bale homes. It also discusses the benefits of a prefabricated straw bale panel system being developed, including reduced costs, improved quality control, and shorter construction times. The authors conclude there is interest in natural building but that standardizing panel sizes and refining finishing techniques off-site are needed to better integrate natural materials into mainstream construction.

Uploaded by

d123
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Is There a Place for Natural Building

in New Zealands Conventional


Housing Market?

A Prefabricated Straw Bale

Case Study
Blue Forsyth, Min Hall and Sven Johnston
Build a Better New Zealand Conference September 2014
Auckland
New Zealand

Natural Materials

Biological - organic

Geological - inorganic

Why is it important?
The Construction Industry is responsible for:
40% annual natural resource consumption
30% energy consumption
30% greenhouse gases

Measures to improve sustainability within the


construction industry have been focused on:
energy efficiency a lot
embodied energy - less

Natural Building in New Zealand

Pompallier House, Russell

From Maori Architecture by Deidre Brown

Longbeach Cottage, Ashburton

Natural Materials in NZ
EARTH

STRAW BALE LOGS CORDWOOD HEMPCRETE

Adobe brick house

Straw bale sleepout

YIMFY Earth Building Workshop


Auckland 2014

Nelson

Motueka

Straw Bale
Nebraska, USA - 1908

NZs First Straw Bale House - Marlborough 1993-5

Straw Bale Construction in New Zealand

Annual Straw Burn-off South Canterbury

Photograph: John Bisset for Timaru Herald, 9 March 2012

PROS

Prefabrication

Panels

Save time
Save money
Improve quality
Improve resource
efficiency (materials and
labour)
Improve workplace safety

Modular

CONS

Components

Complete buildings

High start-up cost


Public perception
Market size
Transport limitations

Straw Bale Prefab


Advantages
Reduce overall build cost
Speed up construction
Reduce weather delays
Plaster all year round in a controlled
environment
Improve quality of and accelerate
plaster application
Reduce risk of exposure to moisture
More suitable for small urban sites
Builders on rural sites spend less time
away from home
Methods
Loose straw
Complete bales

Stramit Board and Durra Panels

Durra panels
Ortech Industries
Victoria, Australia

Stramit panel University of Bath

Ecococon Straw Panels


www.ecococon.lt/english/

ModCell UK
www.modcell.com

ModCell UK
www.modcell.com

Gateway Building University of Nottingham MAKE Architects

Chris Magwood
The Endeavour Centre
Ontario, Canada
www.endeavourcentre.org

Straw Bale Prefab in New Zealand


Sol Design Ltd develop a unique on-site panel system coined tilt bale
10m2 experimental prefab structure, Geraldine 2011
Prefab panels constructed for a power shed for an off-grid property
near Geraldine 2014
Straw Bale Structurally Insulated Panels

SB-SIPs

Building consent granted for SB-SIPS house at Hororata, August 2014

SB-SIPS
AIMS
Pre-finished panels

No additional cladding required


Clean lines

CHALLENGES
Achieving the desired level of finish 'off the mould'

Incorporating flashings - vertical junctions and horizontal


Clean-line detailing connections between panels and to
foundations
Lifting, handling and transporting finished panels 1200-2500 Kg

SB-SIPS Process for Power Shed


www.soldesign.co.nz

Structural Frame

Mould/Form

SB-SIPS Process for Power Shed


www.soldesign.co.nz

Structural Frame preparation

Pre-plastering bale fit and sizing

SB-SIPS Process for Power Shed


www.soldesign.co.nz

Plaster laid in mould

Structural frame positioned in mould

SB-SIPS Process for Power Shed


www.soldesign.co.nz

Pre-sized bales buttered and fitted into frame

SB-SIPS Process for Power Shed


www.soldesign.co.nz

Interior

Exterior

First Custom SB-SIPS Panel

Key Findings
Considerable interest
Plans should be produced expressly for the SB-SIP
system
Panels should be standardised as much as possible to
take advantage of economies of scale

No on-site finishing is a challenge


Major advantages are
o Degree of quality control possible

o Reduction in on-site time


o Ability to work in all weathers

Looking Ahead
The completion of projects underway including:
The Power shed

The first consented SB-SIP house


Geraldine townhouse development
Development of mini-bales
Searching for projects that will facilitate development of
system

Is There a Place for Natural Building


in New Zealands Conventional
Housing Market?
EBANZ conference, Kapiti Coast, Labour
Weekend 2014
www.facebook.com/earthbuilding
International Straw Building Conference 2016
(ISBC 2016) Methven, NZ 3-9 March, 2016
www.facebook.com/isbc2016
www.strawbuildconference.co.nz

Blue Forsyth, Min Hall and Sven Johnston


Build a Better New Zealand Conference September 2014
Auckland
New Zealand

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