IBT Project Guidance (General Background)
To provide the NDoHS with guidance on how IBT projects can be implemented a package of guiding documents were developed. The main document Guidelines for Implementing IBT aims to assist government developers and professional service providers on the management and regulatory processes to ensure better quality homes are constructed.
Further guidance is provided through the dynamic IBT Database listing relevant certified IBT building systems that have thus far passed the NHBRC qualifying criteria after inspection of built homes using the Condition Assessment Tool. When a housing project is to be implemented it is crucial to provide comprehensive specifications for the tendering process for the scope, requirements and professionals to be appointed and therefore have provided an example of a Terms of Reference that needs to be modified in terms of the context of a project.
During the appointment processes of an IBT system owner, as the main contractor (if the main structural component is the IBT) an IBT Analyser can guide the selection process of a relevant IBT in terms of a project location.
Rational Designs (Background)
The National Building Regulations and Building Standard Act, 1977 (Act 103 of 1977) provides different ways for buildings to demonstrate compliance to ensure the health and safety of occupants. In the case of standard “brick and mortar” construction methods the deemed-to satisfy rules provided in SANS 10400 is one method of showing compliance.
However, in the case of non-standard construction (also known as innovative construction) other performance-based methods are required such as the Agrèment Certification or Rational Assessments (Rational Assessment or Rational Design). It is to the discretion of the NHBRC to ascertain whether an Agrèment Certificate or NHBRC Rational Design Approval will suffice when in doubt. Normally, an Agrèment Certificate is preferred for more complex innovative building systems for which the properties or behaviour of a house is unknown.
In the event of NHBRC agreeing to follow the Rational Design Approval process for a residential structure it is important to define what a rational design is. A rational design is any design involving a process of reasoning and calculation that is based on the consistent application of appropriate national or international standards, and engineering codes or other relevant, authoritative and published technical literature.
The purpose of rational designs is to ensure “fitness-for-purpose” of the elements covered by the design. Rational designs are required in respect of housing systems or components, which comprise of materials and/or elements whose properties, characteristics and behaviour may be known or unknown.
A competent person is required for the design of the structural stability to complete the rational design as defined in SANS 10400. In most cases the NHBRC will require a competent person to produce a rational design as defined under the Engineering Profession of South Africa Act, Act 114 of 1990.
Documents and Publications
The Housing Innovation Hub was established in 2005 at Thorntree View (Soshanguve A) in the Tshwane Metropolitan Municipality area in Gauteng in response to the challenges faced in government’s subsidised housing sector. The objective is to provide a platform where the quality of building work can be enhanced.
There are currently interrelationships of functions that contribute to improving building work of which one part comprises of the Innovative Building Technology show houses, while the other parts consist of the Construction Testing Laboratory (Geotechnical and Civil) and the Training Centre.