A: Insulation alone will probably not solve your moisture problem. In fact, modern houses usually have more problems with moisture, molds and indoor pollutants than older homes because they've been insulated mostly for energy conservation purposes and they restrict ventilation - the exchange of fresh air from outdoors.

You need to determine how and where the moisture is getting into the house-do you have a leak, a drainage problem or just too big of a temperature difference between inside and outside without enough ventilation? Also check to see that your lifestyle (i.e. more frequent or longer showers in an unventilated bathroom) is causing the problem.

Once you know where the water is coming from, you can start to solve the problem. This could include new drainage in the yard to divert water away from the house, a sump pump under the house, adding fans to the attic, bathroom or kitchen, adding more attic vents, or a combination thereof. It could involve a process of elimination, trying one thing at a time and waiting to see if it works before trying another step.

You can always use more insulation in your home-in the walls and attic (blown insulation in the walls and attic are the only way to retrofit an existing home) but you cannot and should not install a vapor barrier over existing insulation. Consult a local insulation contractor for specific advice about how much to install in your home.

If you still have moisture problems after that, try to find a conscientious general contractor who specializes in home repair or water damage restoration who would be willing to research the source(s) of the moisture and take steps to prevent it from accumulating in the house.

To locate reliable home improvement specialists, visit Home Advisor and be matched with the ideal service professional in your area.

by Kathy Maynard, reprinted courtesy of HomeAdvisor.com