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Heat - Insulation - Conduction - Buildings.
Loft Insulation, water tank and pipes.
The space between the roof and the ceiling
is called the loft.
Glass fibre is laid across the
loft to reduce heat transfer out of the roof.
Glass fibre traps air like woollen clothing.
The glass
fibre with trapped air is a very
poor conductor
which reduces heat transfer from the ceiling to the loft.
The room in the house stays warmer
for longer (see costs).

Glass
fibre can also be used to insulate a hot
water tank and pipes.
The fibre is put inside a cloth container
and wrapped around the tank and pipes.
This type of insulation is called lagging.
The lagging may also have an
inside shiny surface
to reduce heat loss by radiation.
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