Weatherizing your house is a chore worth attending to. The average unweatherized house in the United States increases the heating bill by 25 to 40 percent, according to the Rocky Mountain Institute, in their book, Homemade Money, How to Save Energy and Dollars in Your Home. Here are some tips for weatherizing your home without adding manmade chemicals, called volatile organic chemicals (VOCs), that can cause a wide range of health problems.
The safest caulk to buy, according to John Bower, author of The Healthy House, is 100 percent silicone, available in most hardware stores. When it dries, it is inert. You can also buy 100 percent silicone “rope” caulk, useful for some big cracks. Make sure to read the labels to make sure there are no added fungicides, as found in products labeled for use in kitchens and bathrooms.