The cost of improving the airtightness of your home through caulking is low compared with the subsequent fuel savings and increased comfort.

Silicone caulking is ideal for metal, glass, glazed tile and plastic surfaces because it sticks, flexes and does not shrink over time.

Acrylic latex caulking is a general-purpose sealant that sticks best to porous materials like wood and concrete.

All-purpose caulking is good for both interior and exterior use, including bathrooms and kitchens.

Polyurethane caulking performs well on both porous and non-porous surfaces, is flexible, paintable, long-lasting and hard as nails.

A heat-resistant caulking should be used around sources of heat, such as chimneys, light fixtures and fan motors.

It is wise not to caulk in an area where the temperature is below 5°C (40°F), as the compound will become stiff and difficult to work.

Caulking should be used for its intended purpose only. For example, an exterior sealant can be a health hazard if used indoors.

To make sure caulking sticks well, clean the surface area thoroughly first and allow it to dry before you caulk.

When improving your home's airtightness, take into account the effect on ventilation.