Building a new home provides the opportunity for preventing indoor air problems.
However, it can result in exposure to higher levels of indoor air contaminants if careful attention is not given to potential pollution sources and the air exchange rate.
Express your concerns about indoor air quality to your LEED architect or builder and enlist his or her cooperation in taking measures to provide good indoor air quality. Talk both about purchasing environmentally friendly building materials and furnishings that are low-emitting and about providing an adequate amount of ventilation.
The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) recommends a ventilation rate of 0.35 ach (air changes per hour) for new homes, and some new homes are built to even tighter specifications. Particular care should be given in such homes to preventing the build-up of indoor air pollutants to high levels.
Here are a few important actions that can make a difference:
There are many actions a homeowner can take to select products that will prevent indoor air problems from occurring - a couple of them are mentioned here.
First, use exterior-grade pressed wood products made with phenol-formaldehyde resin in floors, cabinetry, and wall surfaces. Or, as an alternative, consider using structurally insulated panels(SIP) made from agricultural by-products
Secondly, if you insist on installing wall-to-wall carpet on concrete in contact with the ground, especially concrete in basements, make sure that an effective moisture barrier is installed prior to installing the carpet. Do not permanently adhere carpet to concrete with adhesives so that the carpet can be removed if it becomes wet.
...but you know how I feel about carpeting!!
- Provide proper drainage and seal foundations in new construction.
- Air that enters the home through the foundation can contain more moisture than is generated from all occupant activities.
- Become familiar with mechanical ventilation systems and consider installing one.
- Advanced designs of new homes are starting to feature mechanical systems that bring outdoor air into the home. Some of these designs include energy-efficient heat recovery ventilators (also known as air-to-air heat exchangers).
- Ensure that combustion appliances, including furnaces, fireplaces, woodstoves, and heaters, are properly vented and receive enough supply air.
- Combustion gases, including carbon monoxide, and particles can be back-drafted from the chimney or flue into the living space if the combustion appliance is not properly vented or does not receive enough supply air. Back-drafting can be a particular problem in weatherized or tightly constructed homes. Installing a dedicated outdoor air supply for the combustion appliance can help prevent backdrafting.
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