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What
are the common indoor air pollutants generated from renovation
works causing IAQ problems?
*
dust from polishing, sanding, or grinding of building
materials; and
*
volatile organic compounds (VOCs) from paints,
solvents, and adhesives etc. leading to irritating odour.
.
How
do I know if there are IAQ problems during renovation?
*
If you smell irritating odour or experience symptoms
such as nasal and eye irritations, headache, dizziness,
nausea, or breathing problem at or in the vicinity of the
areas under renovation, there may be potential IAQ problems.
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What
are the possible causes of IAQ problems during renovation?
*
The work areas are not isolated properly resulting in
spreading of pollutants to other non-renovated areas.
*
Dedicated local exhaust is not provided leading to
accumulation of air pollutants in the work areas.
*
No barrier/enclosure is provided to contain dust
emission during cutting and drilling processes.
*
Use of building materials such as paint, adhesive,
lacquer, and thinners etc. that contain high solvent content.
*
Materials such as paints, solvents, clean-up materials
are not properly sealed, stored or disposed of after use.
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What
are the tips to reduce IAQ problems during and after
renovation?
The
following are some good practices that can help minimize the
IAQ problems during and after renovation:
During
renovation
*
Schedule the renovation work during periods of low
occupancy or non-office hours.
*
Isolate the renovated areas from other areas by
installing physical barrier to minimize cross-contamination.
*
Arrange dedicated local exhaust with suitable control
devices in the work areas to reduce dust and other
contaminants.
*
Seal off the inlets and outlets of the ventilation
system in the work areas within air-conditioned premises to
minimize the spread of dust and other contaminants to adjacent
areas.
*
Inspect and change the air filters of the
air-conditioning system more frequently than usual to allow
for higher dust load where renovation works take place.
*
Conduct dusty processes in areas enclosed by partitions
or plastic sheets, and dampen the surfaces with water before
sanding, cutting, and drilling, or, if possible, conduct all
these in off-site workshop.
*
Use environmentally friendly low-emitting materials to
reduce off-gassing of VOCs, e.g. water-based paint,
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low-emitting
carpet/wallpaper/floor tiles, formaldehyde-free adhesive, or
any products with green label.
*
Use pre-fabricated furniture and off-site manufacturing
products as far as practicable to reduce generation of
pollutants during renovation work.
*
Minimize demolition/disturbance of existing finishes
through careful specification of appropriate materials and
innovative installation techniques.
*
Read and follow closely the instruction of the
manufacturers in handling paints, adhesives, cleaning agents,
and other VOC products.
*
Store building materials properly.
After
renovation
*
Clean up the renovated areas and supply large amount of
fresh air to purge them for a period of time prior to
occupation.
*
Maintain a higher rate of ventilation during the first
few months of occupation to help reduce pollutant levels of
the renovated premises.
*
Select furniture with low emissions of formaldehyde and
other VOCs when it is necessary to replace the old one.
*
If new furniture containing formaldehyde adhesives is
used, air them out for at least several days or weeks before
they are admitted indoors.
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