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5
UNIT 1
Table 1. Building materials.
Material Availability Use Properties Problems/
Durability
Came, leaves
vine, bamboo,
palm-fronds
Warm-humid
zones
Roofs Light; does
not store
heat; allows
free passage
of air
Relatively short life
span; deteriorates
rapidly due to termite
attack; highly
combustible
Grass Intermediate
and subtropical
zones
Roofs Light; does
not store
heat; allows
free passage
of air
Relatively short life
span; deteriorates
rapidly due to termite
attack; highly
combustible
Hardwoods
and softwoods
Tropical and
subtropical
zones (not hot-
dry zones)
External
woodwork
Extremes of climatic
conditions cause
dimensional changes,
producing cracks, splits
and warping; wind-
blown sand and grit
gradually erode timber;
liable to wet and dry
rot; attacked by termites
and beetles
Earth Hot-dry lands Walls;
roofs
Low thermal
conductivity;
brittle; does
not withstand
tension well
Termite damage may
require frequent repair
work
Concrete Hot-temperate Structure;
foundation;
floor slabs
Low
resistance to
passage of
heat
Salts cause corrosion of
reinforcement and
spelling of cover; rapid
evaporation and
shortage of water can
result in low strength
cracking and high
permeability
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