Old homes pose dangers.

• Position: Remodeling

As spring warms up and building projects around the house become more plentiful, the National Association of the Remodeling Industry, Des Plaines, Ill., reminds homeowners to keep environmental hazards to a minimum during construction efforts.

Some potential contaminants include lead, mold, asbestos, and radon. Regardless of the part of the house in which a project takes place, there are good work practices that a professional contractor will use to help minimize or prevent circulation and other indoor problems.

Following is a summary of some common contaminants that may be uncovered during construction:

Lead: Old paint is the most significant source of lead exposure. Dust and chips are dangerous when inhaled or swallowed. Be sure lead-based paint is properly removed from surfaces. Dry scraping, sanding, or open-flame burning can be harmful.

Mold: More than 1,000 species are common to the U.S., although only a handful pose any health threats. Mold needs two things to grow: a food source and moisture. Wood, drywall, and ceiling tiles, among other building materials, are available sources of food. Excess moisture in the form of...