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close this bookAppropriate Building Materials: a Catalogue of Potential Solutions (SKAT, 1988, 430 p.)
close this folderExamples of roof materials
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Soil brick roof

KEYWORDS:

Special properties

Simple self-help prefabrication system

Economical aspects

Low to medium costs

Stability

Good

Skills required

Average construction skills

Equipment required

CINVA-Ram block press, formwork for beams

Resistance to earthquake

Low

Resistance to hurricane

Good

Resistance to rain

Depends on finishing coat

Resistance to insects

Good

Climatic stability

Hot climates, highland climates

Stage of experience

Experimental, numerous houses built in Tunisia

SHORT DESCRIPTION:

· This roof construction method was developed by the Swedish Association for Development of Low-Cost Housing, Lund University, Sweden, for a pilot project in Rohia, Tunisia, based on "organized do-it-yourself building".

· Apart from the self-help aspect, the aim was to design a strong roof (that could be walked on), using local materials other than timber, which is in short supply and expensive.

· The principal material chosen was the local soil, called Torba, a finely grained soil, containing 60 % CaO (lime). This was used to make soil-cement blocks with a CINVA-Ram block press.

· The slightly sloped roofs were constructed with precast concrete beams placed very accurately in parallel, at a distance just sufficient to place two soil-cement blocks such that they lean against each other (for which the blocks were made with one short end slanting). The block pairs were bonded with a lime-cement mortar. The completed roof received a coat of cement slurry and later a roughly 5 cm thick layer of compacted soil-cement, which was finally whitewashed.

Further information: SADEL, Arkitekrur 1, P.O. Box 118, 221 00 Lund, Sweden, Bibl. 00.01.