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Weather-stripping, Caulking & Negative effects on Ventilation

You must pay attention to the possible sealing and caulking negative side effects.

See: Basics on Ventilation

Weatherstripping, caulking and ventilation

Since caulking and weather-stripping limit indoor-outdoor air circulation, sealing air leaks in homes without proper ventilation, will also seal their indoor air pollutants and sources of air pollution related with heaters and appliances (those that use gas, fuel oil, propane, wood...).

In other words: in some cases air leaks and gaps may act as a mean for supplying air to homes, acting as vent openings and contributing to ventilation needs. In this case, sealing the gaps and sources of air leaks will contribute to fix the energy loss problem but will also worsen the indoor air quality.

If you think that it may happen with your home, contact your local utility company, or a ventilation or energy professional, before sealing your gaps and air leaks.

See:
Weather-stripping
Caulking
Basics on Ventilation

Sealing and backdrafts

Fixing air leaks – through caulking and weatherstripping - may also contribute to an increased possibility of backdrafts. Backdrafting is unusual but is dangerous and you should be aware of its possibility.

Backdrafts happen when gas, fuel or wood combustion appliances compete for air with exhaust fans. Exhaust fans may pull the combustion gases back into the rooms and living space, creating air pollution and potentially very dangerous situations.