The document describes the construction of modified indigenous Nyishi houses in Arunachal Pradesh using bamboo. Bamboo is the most economically and environmentally suitable building material for the region. [Traditional Nyishi houses] used wood, bamboo, thatch and leaves with a lifespan of 10-12 years. [The modified design] uses RCC posts and CGI sheet roofing, extending the lifespan to 20-25 years while maintaining earthquake resistance through the composite bamboo-concrete structure. The document compares traditional and modified bamboo houses and concludes wider bamboo construction depends on standardized materials, design information, training and government support.

1. CONSTRUCTION OF
MODIFIED INDIGENOUS
NYISHI TYPOLOGY
 BY TANA SUMPI

4. Arunachal Pradesh is situated in the North Eastern part of
India with 83743 sq.kms area between latitude 26 30’ N
and 29 30’ N and longitude 91 30’ E and 97 30’ E. The state
has a long international border with Bhutan to the west
(160km), China to the North and north-east (1080km) and
Myanmar to the east (440km). In terms of area, it is the
largest state in the North Eastern Region.
Arunachal Pradesh was a Union Territory and attained
statehood on
20th February 1987 and although this new state became
the largest state area–wise in the North- East region ,even
larger than Assam , yet the population of Arunachal
Pradesh is the smallest with only 10,96,702 according to
the 2001 census. This population is apparently drawn into
the urban areas as there is evidence of a high level of
urbanization.

5. THE NYISHI TRIBE OF ARUNACHAL
PRADESH

6. PURPOSE???
• To bring forth the idea of construction
of houses in the north eastern region
using bamboo.
• Bamboo is the most economical and
easily available material for
construction in the north eastern
regions.
• Bamboo is the most ECO FRIENDLY
material and it is the need of the hour.

7. BAMBOO tree- bambusa
pulgaris

8. STRUCTURAL PROPERTIES OF BAMBOO
FIBRES RUN PARALLEL TO
THE AXIS OF THE CULM
(stem)
NOT CONTINUOUS ALONG
THE LENGTH, THEY BEND
TOWARDS THE INSIDE OF
THE NODES
 NO RADIAL FIBRES EXIST
THE MORE THE FIBRES
, GETS MORE DIFFICULT TO
FRACTURE THE MATERIAL

9.  BAMBOO POSSESS HIGH
ELASTICITY
BAMBOO ELASTICITY IS
1.5 to 2.0 x 105 kg / cm2
The specific gravity is 0.575
The average weight is 0.625 Kg/m
The reinforcement nodes
(diaphragms) prevent the
emerging longitudinal
cracks from spreading over
the entire tube length.

10. TRADITIONAL BAMBOO
HOUSE

11. • The indigenous house
is constructed with
Wooden & Bamboo
using (Thatch,
Chinese Palm leaves,
Cane leaves and
Jungle Banana
Leaves) as roofing
materials whichever
is locally available.
• The entire Joint are
bind with cane ropes

13. Parts of a local Nyishi house
• THE KITHCEN CUM FIRE
PLACE “emmi”
• The base is constructed
with four bamboo
support and on the
surface of the room 4
1 foot wooden blocks on
a banana leaf and then
soil is applied upto the
height of the blocks,thus
the stove can be laid for
kitchen purpose.

14. THE ROOF MADE WITH BAMBOO
TRUSS, TOKO LEAF AND CGI SHEET

15. The FRONT verandah The REAR verandah

16. DRAWBACK…
The longitivity of this type of house is
10 to 12 Years by replacing roofing
materials after every 3 to 5 years.
The wooden foundation used gets rut due
to bacterial action and there is danger of
structure collapsing.
During very heavy rainfall the roof starts
leaking because of which the local
people have sorted out the modified type
of house construction.

17. THE MODIFIED TYPOLOGY

18. BAMBOO WALLING

19. • The improved
indigenous Nyishi
house have similar
plan but construction
materials are changed
in some parts that is
the pillars portion is
replaced with RCC Post
with RCC footing AND
roofing with CGI sheet

20. • The roofing
materials are
bamboo chims and
CGI Sheets in place
of Thatch, Chinese
Palm leaves, Cane
leaves and Jungle
Banana Leaves.
• The longitivity of
the improved type
of indigenous Nyishi
House is about 20
to 25 Years.

21. • The modified typology
is more earthquake
resistant due to the
composite material
used i.e combination
of concrete and rcc
with the commonly
available bamboo.

22. AN AUTOCAD PLAN OF THE NYISHI HOUSE

24. • The Houses floor level is
raised 2.50 Mtr from the
ground level and ceiling
level is 2.50 Mtr from the
floor level.
• The plan consists of rear
verandah, Common room
with fire place, bed room,
Guest room, Front Verandah
& side verandah.

25. COMPARISON
S.No ITEM Cement Concrete house Bamboo based house
1 Cost /sq.ft Rs.800-1000 Rs.450-550
2 Life span 75 years 15years
3 Annual maintenance All most negligible Bi annual insect maintenance
must
4 Time for construction Min. six months Min. two to four weeks.
5 Skill labour availability more Less
6 Quality control Testing labs available every
where.
Yet to be developed.
7 Quality of building material
availability
plenty Quality bamboo availability
limited
8 Other building components available Very few sources for roof,
door, and floor bamboo
based products.
9 Pre cast building
components
available Yet to develop
10 Scope for application Every where Suitable for earth quake
resisting structures
11 Suitability Every where Quality bamboo producing
areas like N-E.
12 Need for further
development
Already well developed and
lot of research going on.
Need for more research.

26. ADVANTAGE..
• The Nyishi typology is very
flexible and light structure
thus resistant to earthquake
because of its light weight
construction. Also If damaged
in case of devastating
earthquake rector scale there
will be less casualty or zero
casualty because it will not
collapse like rigidly built brick
walling and heavy and rigid
building.

27. CONCLUSION
Development of Bamboo houses depends on
• availability of graded & standardised raw material
and eco friendly preservatives and preservative
facilities;
• Access to design information like standards & codes,
design procedures to engineers/ Architects;
• trained man power
• Participation of NGO’s and Government in
encouraging wider use of bamboo building;
• standard designs and Do-it-yourself kits.

28. the stiffest
tree is most
easily
cracked
during
strong winds
but the
bamboo
survives by
bending with