Disaster recovery sustainable housing

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Special Issue: 16 | ICPECDM-2014 | Dec-2014, Available @ http://www.ijret.org 1
DISASTER RECOVERY SUSTAINABLE HOUSING
Indubhushan Patnaikuni1
, Robert Oates2
Abstract
Disasters due to Natural causes and man-made around the world make many people homeless every year. Disasters such as
Pakistan floods in 2010, Haiti earthquake in 2010, Chile earthquake in 2010, Japan earthquake in 2011, Philippines hurricane
Yolanda in 2012, the earthquake in Sichuan, China in 2008, the Cyclone Nargis, Mayanmar in 2008 and the 2004 Tsunami
remind us of the enormous human suffering and the magnitude of destruction to infrastructure they can cause. In spite of the best
efforts of the international disaster response mechanisms currently available, evidence suggests that the most vulnerable among
the affected remain entrapped in a vicious cycle of poverty and hopelessness. For these people who are affected the most urgent
need is to provide, food, medical assistance, maintaining hygiene and providing shelter within a short timeframe. However, the
long-term recovery of affected people would largely depend on their ability to re-gain permanency in housing. This paper focuses
on this aspect of response and recovery process and presents a product which is purpose designed not only in providing timely
and speedy shelter but also could be used as the formwork in up-grading the temporary shelter to a permanent or semi-permanent
home.
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INTRODUCTION
Chinese officials have announced an international appeal for
3 million tents immediately after the Sichuan earthquake in
2008. It was also reported that in Aceh 42% of the houses
built after the tsunami were not habitable in the long-term.
Some of this 42% were made habitable with further
expenditure and retrofit but the rest were demolished or
abandoned. This indicates that the housing sector has not
shown promising recovery in a long-term perspective in
Disaster Response and Recovery (DRR) sphere. The above
two aspects highlight two fundamental realities of long-term
capability building of such affected communities. There is a
huge demand for tents - a quick response temporary shelter
as well as a viable semi-permanent housing. Such demand
would encourage the researchers and designers to develop
innovative solutions, in responding to the housing needs
after a disaster, focusing on not only quick response but also
the long-term recovery process as a capacity building
exercise to the affected people giving hope. It is important to
minimise the indirect third party expenditure which
otherwise would shrink response delivery budgets.
Therefore it makes sense to investigate products and
procedures which stimulate recovery. This could only be
achieved if such products can demonstrate an alternative
building technology that possess three phases of recovery -
speedy responsiveness, relief and re-development - in a
cascading manner inducing hope of recovery within the
community. Stigma of being perceived as “temporary” can
breed hopelessness and long-term dependency.
The product, H-HUTS presented in this paper encompasses
the above mentioned values with several other advantages.
UN organisations, FAO, UNOPS, UNESCO, UNDP, UN
Secretariat have registered This product. There were offers
from other organisations also. Following shows the rationale
behind the development of the product in brief:
CONCEPTUAL DEVELOPMENT RATIONALE
OF H-HUTS
 H-HUTS shelters are designed and developed to be
simple, constructible, affordable, and broadly
useful. The concept is based on Japanese origami.
This product uses simple materials and hand tools
in a unique way to respond to a disaster situation
by the way of owner-built housing, with
participation by stakeholders across society.
Cardboard is main material used for this product
which comes from packaging industry. The
packaging industry represents about 5% of global
GDP and is well capable of supporting expansion
of this project globally (Fig. 1).
 This as an engineered product which is tested for
structural adequacy.
 Structures built using this method are very much
acceptable and inspire creativity in first-time
builders. The product permits windows and door
placement without reengineering. It is possible to
achieve altered form by removal of modules and
choices in conjoining structures, leading to more
diverse cultural acceptability (Fig. 2).
 The procedure of building these structures is highly
participatory and provides hands-on project
activities, as can be seen through the pictures and it
can create a feeling of commune and lift corporate
social responsibility which could empower the
affected community. Industry stakeholders are
invited to adapt to their interests, products or
services to help meet needs of a given situation at
several project stages (Fig. 2) offering
opportunities to influence how their products and
brand image are viewed in good light of social
responsibility. Community engagement and there
by capacity building is emphasised.
 It is possible to provide Hands-on school packs to
educate, train and build awareness amongst

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younger people.
 As there is no frame and is double-skinned and has
well-insulated roof and walls, it allows great
economy of materials and energy. Cross ventilation
improves comfort levels and also the life span of
the cardboard formwork.
 The cardboard as building material, self-financed at
about $0.25 per person per day and owner labour
equity mean the third party expenditure, which
otherwise would shrink response delivery budgets,
is bypassed.
 Durable and Permanent basic shell structure can be
formed using the temporary cardboard skin as
formwork using reinforced shotcrete or lightweight
concrete after a reasonable recovery period to make
the temporary shelter a permanent home. It is quite
possible to envisage, with little supervision and
assistance, that community taking charge of their
own destiny. Reinforcements can be locally
available natural fibre such as Coconut, Palm,
Bamboo, Banana plant etc. Modern low-
maintenance renders can be used for durability and
there is no need of painting.
 From a long-term recovery perspective,
affordability linked to capacity in making
repayments on borrowings permits greater
inclusiveness of the community. Construction costs
of converting shelter to a permanent housing are
minimal and can be spread over a longer period
where affordability to hire someone can be trade–
off against his/her labour capital which enhances
the co-operative existence, which is paramount, at
the early to middle part of the recovery process.
Figure 1: Proposed shelters are constructible, affordable, simple and broadly applicable

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Figure 2: Built structures are perceptually acceptable and
inspire creativity in first-time builders.
Figure 3: Modules can be combined to form larger
enclosures for temporary schooling, communal kitchens and
recreation and trauma recovery activities.
SPECIFICATIONS OF CONSTRUCTION
SYSTEM AND STRUCTURAL ADEQUACY
H-HUTS use a modular construction system based on
Origami. Origami-made cardboard boxes are fabricated as
building modules to make the roof and walls of small, or
large, structures. Outdoor structures can be used as
emergency shelters by transforming a cover converted from
a standard tarpaulin or thick flexible plastic sheets, without
requiring sewing or machining. A shelter can be assembled
by a person/persons with minimally assisted unskilled
labour in a day without requiring power tools.
Properly constructed passageways (Fig. 3) can create larger
dwellings or large community space by combining
individual modules. They can be made more permanent by
upgrading surfaces with a render finishing system, making
the cardboard merely redundant formwork. H-HUTS render
is lightweight, imparts added structural strength, improves
resistance against fire, mould, insect, improves home
insulation and improves energy efficiency. Such combined
systems are more stable against up-lift due to wind.
H-HUTS renders and exterior plasters are a proposed
improved blend of traditional polymeric silicate renders and
modern, alkali and weather-resistant, low glass transition
polymers to form organo-silicate matrixes. This novel blend
vastly improves adhesion, hydration, compressive strength,
waterproofing and weathering. It further improves resistance
against freezing and thawing in cold conditions. They can be
produced in a range of light, stable colours that are very
resistant to fading. It does not require painting and the
organo-silicate blends have been found to provide
outstanding weathering.
H-HUTS renders utilize a new type of interstitial packing to
achieve real improvements in insulation properties that are
not explained by the types of fillers and silicates employed.
Part of the mechanism is thought to be attributed to a change

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in the state of these extenders and aggregates over a
relatively narrow temperature range.
Heat probe analysis has shown that 10mm of H-HUTS
render can supply the insulation of 100mm of brick and can
be applied much faster at approximately 25% of the cost of
bricklaying. H-HUTS renders will allow a house to be
coated in one day. In combination with the low cost rapid
response construction method described above, it would
transform the temporary shelter to a durable and more
permanent structure that would be comparable to a thermal
comfort and stability of a standard home.
Table 1: Achievable properties of H-HUTS render (to be verified through testing)
H-HUTS renders target properties
Compressive strength 2000 PSI (13.88 MPa)
Weathering 4000 HOURS < 0.50 Delta E
Water resistance < 3% (versus 20-30% for conventional renders)
Permeability < 3.0 (GRAMS/SQ.M/CM/24 HOURS)
Flammability 0-1 (0=BEST, 10= WORST)
Smoke emissions 0-1 (0=BEST, 10 = WORST)
Shrinkage < 0.25% (28 DAYS @ 20 C and 50% relative humidity)
Insulation 0.33 K FACTOR
Adhesion 250-300 PSI (1.74-2.08 MPa); Positest pull off cohesion failure only
H-HUTS system was also tested by a reputed engineering
firm in Australia for static design wind loads. This has
involved testing the system under four incremental steps
(25% each) of static loading where 100% represented
cyclone category 1 as per the Australian standards (AS/NZ
1170.2). Results are given in the report GHD –
32/12624/37728. Shelters have performed well during 11-
month field trial under normal serviceability conditions as
well.
OTHER APPLICATIONS
H-HUTS also have a great potential in poverty alleviation
programs, with or without the community being affected by
a disaster. Strategies utilising the cardboard as a building
material has extremely low financing needs around 25cents
per person per day and owner labour equity allowing
financially disadvantaged families to consider improvement
in their living standards according to an achievable tiered
plan over short to long term time span.
Overarching poverty reduction strategies should integrate
and mainstream the whole-of-life disaster preparedness
cycle - prevention, response, and recovery/rehabilitation.
The idea of incrementally improvable habitat development
knowhow, as demonstrated above, and the expertise would
undoubtedly enable transitional development capabilities.
CONCLUSION
1. It is well known that large proportion of the internally
displaced people due to disasters stay entrapped in a
cycle not being able to recover over a longer period
than preferable/envisaged.
2. After any disaster these shelters can be erected in a
short time so that the displaced persons do not suffer
without shelter.
3. The product can be easily transported in flat packs
which do not require large volume of space for
transportation.
4. As the product is light weight product transportation
costs will be relatively less.
5. The ability not to recover in a short time calls for
disaster relief agencies and the concerned agencies to
seek more creativeness in seeking sustainable solutions.
Post disaster response strategies must be viewed in
light of long-term recovery.
6. One major area of concern is housing and it is arguably
the most important aspect of the recovery process.
Evidence suggests this sector is the weakest and needs
more attention and innovation.
7. An affordable and robust solution is presented here
which enhances the speed of response and potential for
long-term recovery.
8. With further support this product can be improved to
cater for the very high demand in future disasters.
9. Product is not only developed and engineered as a
technically viable product but also has number of
benefits embodied in it to empower the affected
community by shifting the stigma associated with
hopelessness in people who are affected.
REFERENCE
[1]. AS/NZ 1170.2 (1989), Wind Loads, Standards Australia,
Australia
[2]. GHD – 32/12624/37728, Report for HUT Project,
Interim Report on Initial Testing, October 2006

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