Company: Freyssinet Posten (Pty) Ltd
Tel: (09 264) 61-4261
Address: Timber Building Systems (Pty) Ltd
Reappraisal No 1
The Wigwam system consists of:
- a cast in situ surface bed with a thickened edge, or a steel base frame on concrete blinding;
- external wall panels of a single GRC skin bolted to steel angle columns;
- internal walls of gypsum plasterboard, brickwork or panels with polyurethane foam insulation which is plastered;
- roofs with steel beams and purlins; the beams are bolted to the columns;
- conventional profiled roof sheets of galvanised steel.
The following improvements can be made to houses to upgrade them:
- lining the walls and insulating the cavity (eg with a glassfibre blanket);
- installing ceiling panels of Kulite or profiled sheets with Sisalation.
Mantag Certificate 1991/M34 (Reappraisal 1995) covers the use of the Wigwam system in selected areas in all climatic zones of Southern Africa for the erection of simple, single storey buildings for the following uses:
- detached houses and ancillary free-standing buildings such as toilets;
- non-residential school structures.
However, calculations show that small houses (ie with a floor area of 30 m2) will not meet Agrément South Africa`s minimum thermal criteria in all climatic zones unless they have ceilings and lined walls. They can therefore only be regarded as temporary shelters until ceilings and wall linings have been fitted.
Mantag certificates are a distinct type of Agrément certificate, based on acceptable safety and health criteria for houses and related outbuildings, non-residential schools and primary health-care centres in areas where the local authority is of the opinion that the type of construction is appropriate, given that in these areas it is of paramount importance that buildings be erected at the lowest possible cost.
If the conditions of this Mantag certificate are complied with, Agrément South Africa is of the opinion that the Wigwam system will be fit-for-purpose, and can therefore be regarded as complying with the functional requirements related to safety and health contained in the National Building Regulations. In general, however, Mantag criteria permit a lesser level of performance than would be expected from buildings erected in accordance with the deemed-to-satisfy rules contained in SABS 0400-1990, The application of the National Building Regulations.