Water dripping down from the ceiling is an obvious sign of leakage. But
sometimes damage from moisture may not be immediately visible to the
eye; it occurs behind the cladding. A moist, dark environment is an
ideal breeding ground for mould, which can go undetected for a long time. Yet
whether it grows behind the wall, or on the wall or ceiling: mould can cause
serious health problems for people living in a leaky home. This is in
addition to the risk of damage that damp and mould cause to the building
structure.
Respiratory problems, nausea
and skin irritations from toxic spores
Damp living conditions affect many people and can worsen the symptoms of
illnesses such as asthma, bronchitis and other breathing disorders.
Damp also encourages the spread of dust mites which can further
worsen these disorders. Damp insulation within the wall framing
dramatically reduces the insulation value, making rooms harder to heat. The
combination of cold damp rooms and the presence of some types of mold will worsen
respiratory problems for the very young and very old.
In addition to these problems, some fungi which grow within wet wall
cavities are toxic. In particular the Stachybotrys mould produces
spores which carry chemical toxins known as mycotoxins. These may
cause flu like symptoms. They particularly affect the young, the old and
those with weakened immune systems. (CB)
Dormant evil behind the wall
If mould is present but invisible, it is not an immediate health risk. Many
toxic moulds grow only inside wall cavities. However, if it spreads to walls
and floors and is visible, or if wall cavities are opened, the spores can be
released.
For example: Stachybotrys can be present within a damp wall cavity with no
obvious signs or ill effects, but once exposed the fungus will produce airborne
spores which can be inhaled by those in close proximity. If
Stachybotrys is found, occupants will probably need to leave the home while
repairs are made. People working on the removal of affected timber have to wear
protective gear. (CB)
Please note: Other factors not related to the leaky buildings syndrome can also
cause mould: excessive internal moisture from poor ventilation, use of unflued
gas heaters, lack of exhaust fans in kitchens and bathrooms, all of which lead
to condensation build-up on walls and ceilings.