Appropriate Building Systems
 

Development Alternatives has brought out an Instruction Manual for Appropriate Building Systems in co-operation with Building Materials and Technology Promotion Council, New Delhi. 

The publication has received favourable review from professional architects, engineers and planners.  It is priced at Rs. 150/- only. 

We publish extracts from the Manual for wider dissemination. 

Contents 
1.

Building Techniques

  Brick Foundations
  Compressed Soil Block Walls
  Arched Openings
  Sandstone Roofing
  Jack Arch roofing
  Micro Concrete Roofing
 
2. Building Components
  Compressed Soil Blocks
  Burnt Country Tiles
  Micro Concrete Tiles 
 
3. Annexures
 

1.  Beam Sections for

  Sandstone roofing
  Jack arch roofing
 
  2.  Rafter Sections for
  Burnt Country Tile
    Micro Concrete Roofing
    Costing of Comparative Techniques
 
  3.  a) Conversion table
    b) Physical characteristics
    c) Cross Sectional Area & Weight/m of steel bars
    d) Master rate list
 
  4. a) Glossary
    b) Abbreviations
 
  5. Bibliography

1.  Introduction

Improving the quality of habitat has been the concern of an increasing number of building professionals.  A lot of work has been done in the last 40 years to introduce modern building technologies in our small towns and rural areas.  Most of these efforts have been derived from methods and systems of building that have been developed in industrialised economies which have limited relevance to house construction in our country.
 

Most houses are

Built out of locally available materials like mud, thatch, stone and timber or indigenous building  products like bricks which are produced by local artisans.
Built by the house owner and his family  with the assistance of artisans like masons and carpenters.
Built at low cash cost in the villages since a substantial amount is contributed through self-help and local building materials which have been collected.

The building of houses in most parts of India is a process that is thus very different from the organised construction industry in cities.  It is clearly evident that  a new approach and training of a special cadre of people is required to translate the benefits of engineering sciences into better houses for the majority of our people. 

Industrial system of production critically depends upon large-scale concentrations in centres like cities to reduce their substantial overhead costs.  This makes it difficult for them to be successful over wide regions not linked to urban centres without centralised distribution mechanisms.  Their products need to be purchased with cash - a limited resources in most villages.  it is clearly evident that the profits of production are also channelised through centralised means into a few pockets. 

Looking at a people’s way of building presents its own limitations.  Most artisans have been trained from generation to generation in traditional techniques.  Since they have neither had the access to modern tools of production nor formal scientific training and education, their use of industrial technologies are craft based. 

The resulting buildings are often of low quality and often of low quality and durability and often consume a great deal more on resource cost such as in over reinforcement of beams and slabs.  The artisans have lost traditional skills previously possessed by them.  As a result, the building trade is poorer all around. 

Hence a large number of people and organisations have been trying to look for methods of helping propel in improving their habitat through promotion of alternative building materials and technology.  The concept of ‘Building Centres’ has been widely propagated regionally in order to address this situation directly through:

Making available improved building components using local materials.
Providing expertise through trained professionals to build with these techniques.

At Development Alternatives 

The ‘Shelter Group’ of Development Alternatives has been building for the past eight years with alternative building methods largely based on earth construction techniques.  The systems  have mainly used compressed soil blocks as the walling material with different roofs.  The experience gained by the Group in its building projects have been disseminated to artisans and building professionals through many training programmes specially tailored to provided hands-on experience. 

As an extension of the dissemination efforts of the group a reference document for these techniques in the form of an ‘Instruction Manual’ has been prepared by the group.

What is an ‘Appropriate‘ Building System

It uses local materials and skills
It promotes self-reliance
 It is cost-effective
It is energy efficient
 

The Use of Local Materials Means

Very little cost of transportation
Ease of construction and maintenance since people have the skills
Cultural familiarity since the settlement reflects the lifestyle and culture of the community.
 
How Does the Help ‘Village Economy’
In any building construction several resources must be considered to determine its cost:
Material used - Industrially manufactures or locally available
Manpower used - Professionals, artisans & labour
Finance - Based on materials and manpower used, it determines who benefits from the transaction e.g. increased use of Asbestos.

Corrugated Cement Sheets would increase demand, thereby determining the scale and growth of a capital based industry.  However, when a local material such as stone is used, it generates income, fulfils a need and improves the standard of living locally where it is needed.
Information & know-how - Determined by the process of production of a material and its use in construction.
 
Total Cost of Building
1. Industrial building materials
2. Village materials which are monetised+
3. Village materials which are freely available+
4. Skilled labour+
5. Unskilled labour+
 
Monetised component (1+2+4)
  The amount of cash to be paid
 
Self-Help component (3+5)
  Material which the family can collect and the labour it can contribute.
 
Village economy component (2+3+4+5)
  Represents the inflow of the village or the local economy in any transaction - Be it self-help, cash to pay local labour, locally bought material and all indirect costs such as transport.
 
The Direct Advantages of a High V.E.C. Are:
It brings down cost and makes housing more affordable.
With the use of local materials and techniques; replacement, additions and upkeep is easy.
It improves the economy of the village by creating a local production and consumption cycle, the advantages of which accrue directly to the village community.
 
Thus, an ‘Improved Technology’ has to:
Be economically viable at every level
Pay the people to establish a system of production
Be in congruence with the level of local technology for construction and maintenance.
 

A Buildings should be seen as a composite system of mutually determined sub-systems:

Walls
Roofs
Foundation
Finishes
 
The performance of each system depends upon the:
Compatibility of sub-systems
Design, construction and maintenance of these sub-systems
The performance and quality of the materials that constitute the sub-system
 
Why Building System ‘Analysis’?
Building designs are sub-optimal since designers have no details on these systems
Since inadequate information exists on production, maintenance, construction details and economics of new building systems; nobody is willing to risk building with them.
Technology alone does not reduce cost - The mode of production does.
Multiple and often conflicting goals have to be dealt with.  Analysis and comparison between systems helps make explicit the pay-offs within and between systems.
 
For optimal design of a building we have to make explicit the trade-offs between:
Architectural design
Structural design, and
Cost of construction
 
Hence the need for a ‘Manual’
For ‘Whom’ Is This Manual?  For the Architect & Engineer:
To take basic design decisions when using these systems.
To get a clear picture of the strengths and weaknesses of these techniques in comparison to conventional methods in order to choose an ‘Appropriate’ technique.
To keep a check on the quality of construction.
 
For the Site Supervisors:
Thumb rules for estimation of quantities of materials
To calculate costs involved
The ‘do’s’ and ‘don’ts’ to ensure that the construction is properly executed when using these technologies.
 
For the ‘Master Builder’ who takes on one or more of the above roles at any time
This manual does not in any way substitute the experience in construction or the skill of traditional artisans.
 
How To ‘Use’ This Manual?
This compilation gives information about:
How to ‘choose’ a system for your building
How best to ‘optimise’ this system
How best to ‘build’ with it.
 
This Manual has ‘Three’ sections:
1. Building Techniques
2. Building Components
3. Annexures
Each building technique has been described in ‘Four’ pages to help answer the following questions.
 
  Page 1  Is this technique ‘appropriate’ for my needs?
  Page 2 & 3 How do I ‘build’ with it?
  Page 4 How much would it cost?

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