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  • IMPLEMENTATION OF INNOVATIVE BUILDING TECHNOLOGIES IN HUMAN SETTLEMENTS

    J Mahachi, Pr.Eng, Pr.CPM

    National Home Builders Registration Council

    Email : jeffreym@nhbrc.org.za

    Sunninghill, South Africa

    *

  • Presentation Outline

    Government Vision for Sustainable Human SettlementsChallenges in Housing DeliveryHousing TypologiesPromoting IBTThe Future of Human Settlements in South AfricaInitiatives Undertaken by NHBRCChallenges in Implementing IBTImplementation StrategyWay Forward

  • Governments Vision for Human Settlements

    The strategy incorporated in the Governments vision for Sustainable Human Settlements is to:

    accelerate delivery (1.5 million housing opportunities), use housing provision as a job creation strategy, ensure access to property and home loans by all,leverage economic growth, combat crime, reduce duality within the housing market, and develop integrated and sustainable human settlements.

  • Challenges in Housing Delivery

    Current challenges in housing delivery include:

    Limited physical production capacity;Availability of funds, land etc.;Most popular method of construction is Brick and Mortar Reliable Technology & Meets technical standards;However, pitfall of Brick & Mortar Rate of delivery, which will impact on cost.

    Need to promote Innovative Building Technologies to take advantage of shorter per unit construction periods

    - No compromise on quality & integrity of house

  • NHBRCs Contribution to Sustainable Human Settlements

    Who is the NHBRC?

    Legislated entity established in terms of the Housing Consumers Protection Measures Act.

    Mandate of NHBRC

    3(b) to regulate the home building industry;3(d)to establish and promote ethical and

    technical standards in the home building

    industry; and

    3(e)to improve structural quality in the

    interests of housing consumers and the

    home building industry.

    *

  • NHBRCs Contribution to Sustainable Human Settlements

    NHBRCs involvement in:

    Contributing to Governments national policy on Sustainable Human Settlements;

    Designing and production of project documentation of housing typologies and sustainable housing solutions for the subsidy & social housing sector;

    Developing standards that ensure sustainability of houses; and

    Providing a warranty on all enrolled houses.

  • HOUSING TYPOLOGIES:WHERE ARE WE COMINGFROM?

  • House Built Pre - 1994

    Match Box houses were built.

    Size of houses were 12 to 17m2.

    No standards existed.

    Poor quality houses.

  • Post 1994 to 2004 Subsidy Houses

    Governments approach was mainly to provide land.

    Little emphasis was placed on top structure.

    Size of houses increased to 30m.

    Regulations for the subsidy (social) houses introduced in 2002.

    Quality slightly improved.

  • Post 2004 2009 40m2 Breaking New Ground

    NHBRC engaged by government to assist in delivery of better quality products.

    Minimum of 40m2 houses introduced.

    Government introduces a variety of housing typologies.

  • 2009 2014 Sustainable Human Settlements (SHS)

    Government moves from provision of houses to SHS.

    Promotes innovation:

    Energy efficiency;

    Affordability;

    Constructability (easy to construct);

    Sustainable construction principles;

    Quick to construct;

    Low maintenance; and

    Easy to have additions or alterations to the houses.

    Housing is not about Houses

  • The houses:

    Are planned and designed in terms of energy efficiency principles before construction;Located in a neighbourhood that facilitates the sustainable use of resources;Just large enough to satisfy demand and built with materials with minimum embodied energy; andHave windows that allow for cross ventilation for cooling.

    2014 to the Future Embracing Green Building Technologies

  • NHBRC view on Innovative Housing Systems?

    Product

    Use of new materials in building houses.

    Process

    New ways or methods of applying traditional materials;Improvements in designs to enhance functionality of a housing.

    Hybrid of Products (Conventional & New), or processes.

  • Promoting Innovative Building Technologies

  • Why Promote Innovative Building Technologies?

    Anticipated Benefits:

    Sustainable, durable materials;

    Good thermal properties;

    Reduction in carbon footprint;

    Social acceptability;

    Cost effectiveness;

    Fast track construction processes (time saving = cost saving); and

    Bankability and resale value.

    Assist Government in delivering good quality homes and reducing the current backlog

  • NHBRC and Agrment Approval of IBTs

    Structural Safety

    Resistance to static and dynamic actions, both individually and in combination, impacts, intentional and unintentional abuse, accidental actions.

    Structural Serviceability

    Resistance to loss of function, damage and avoidance of user discomfort.

    Structural Durability

    Performance retention of the structure.

  • Approval of IBT

    Fire Safety

    Egress, fire suppression, fire resistance, risk of outbreak of fire and of spread of fire, physiological effects (smoke control and ventilation), and evacuation time (escape routes).

    Constructability (Quality Assurance)

    Transportation to site, erection procedures, quality control, health and safety.

  • Approval of IBT

    Energy Efficiency

    The extent to which the building envelope optimises the amount of energy required to achieve a required level of indoor climate control.

    Condensation

    Depending on area.

    Acoustics

    Performance.

  • The Future of Human Settlements

  • Choice of Site:

    The site is chosen in order to reduce costs of living through:

    Living close to amenities;

    Easy access to transport;

    Nearby work opportunities;

    Growing own vegetables; and

    Paying less for electricity and water.

    Economic Consideration

  • Reduction of internal boundaries;Housing units that are modernistic reflect South Africas appreciation for nature by its abstract application of natural materials, warm colours and textures; andDesign of walk-ups to reduce the use of land.

    Social Considerations

  • The built environment is directly and indirectly responsible for:-

    Consumption of the earths resources (especially energy),

    Generation of polluting toxins (e.g. coal burning) and waste,

    Creation of conditions leading to loss of soils and biodiversity, and

    Interference with life support systems (e.g. water cycle, soil systems and air quality)

    It is estimated that 60% of all energy consumed on earth goes towards manufacturing of building materials, physical building of structures, their operation throughout their life span, and eventual demolishing and recycling.

    Green Economy Considerations

  • Features Considered in the Energy Efficient Design of the Houses

    Planned and designed in terms of energy efficient principles;

    Just large enough to satisfy demand (Looking at the possibility of increasing the footprint to 60m2);

    Minimum specification of social houses to be 2 Bedroom, a lounge, kitchen & bathroom.

  • Features Considered in the Energy Efficient Design of the Houses

    Design Perspective:-

    Maximise the advantages of correct orientation first, prevailing wind directions second, and lastly aesthetic natural views.Using low embodied and innovative building materials.Have large windows on the northern side, placed to maximise natural light and restrict the use of artificial light during the day.Have high and sloping ceilings to allow ventilation during the evening.

  • Features Considered in the Energy Efficient Design of the Houses

    Designed to have floors constructed of high thermal mass materials in order to collect heat from the winter sun and releasing it slowly thus heating the houses at night.

    Houses painted in light colours internally and externally, internally to maximise light and externally to reflect heat.

    Rain water harvested through the provision of water tanks and used for vegetable garden.

    Houses to have solar water heaters to supply the kitchen and bathroom.

  • INITIATIVES UNDERTAKEN BY NHBRC TO PROMOTE IBT

  • Product Innovation:Innovation in Foundation Solutions

    The Modulo System

    Designed for Strength

    Foundations built using a permanent formwork in recycled polypropylene that creates a system of pillars and arches that will permanently support the ground floor slab once concrete is poured on.

  • Innovation in Foundations

  • Innovations in Foundations

  • Product Innovation:Use of Lightweight energy panels

    Walls consist of a 150mm thick expanded polystyrene (EPS) beaded concrete core encapsulated both sides with a 4,5mm calcium silicate boardWalls are fixed together using an interlocking tongue and groove method between the panels and the use of mortar sizing liquid to bind and seal.Internal walls are made of a similar panel but 120mm thickThe roof consists of light gauge, structural steel trusses.Ceilings are always fitted as part of the system and are insulated

    Interlocking EPS walling system

  • Product Innovation:Use of re-cycled concrete blocks

    Recycled concrete blocks

    Concrete masonry units produced using recycled concrete have a lower embodied energy.The blocks are manufactured using