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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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Gypsum-sisal conoid

KEYWORDS:

Special properties

Innovative material and design

Economical aspects

Low to medium costs

Stability

Good

Skills required

Special training

Equipment required

Simple wooden framework

Resistance to earthquake

Good

Resistance to hurricane

Good, if protected from rain

Resistance to rain

Low

Resistance to insects

Good

Climatic suitability

Dry climates

Stage of experience

Experimental

SHORT DESCRIPTION:

· This is an experimental unit, developed by Prof. Roberto Mattone and Gloria Pasero at the Turin Polytechnic, Italy.

· The conoid unit has a shape which makes it suitable for use as roofing as well as wall components.

· The aim was to produce a strong, versatile component from gypsum and sisal (which are abundantly available in some regions), using simple formwork and equipment.

· Laboratory tests showed a good strength to weight performance, since the fibres have high tensile strength and bond well with the gypsum. Furthermore, resistance to fire and biological attack is good.

· The main drawback is the solubility of gypsum in water, which calls for a completely waterproof surface protection.

Further information: Prof. Roberto Mattone, Facolta di Architettura, Politecnico di Torino,

Viale Mattioli 39, Torino 10125, Italy; Bibl. 23.15.


Preparing the formwork: the timber frame is filled with broken bricks and stone, first large pieces, then small pieces and finally a fine sand, which is smoothed to the desired shape, and covered with a polythene sheet. On this the gypsum-sisal mortar is spread to form the conoid.


Potential assembly of the modules