All the wood used in the house has been sprayed with a solution of sodium borate and water at a ratio of 120 grams of sodium borate per liter of water. When I visited last September, most of my time was spent in spraying all the posts and beams used in the first floor of the house. Now, we are doing the same treatment for all the wood used in the roof structure. Sodium borates are naturrally occuring salts that result from the combination of two elements: oxygen and boron. The are found as mineral deposits around the world. They are considered benign for human health and have proven to be effective in preventing attacks from wood-pests and fungi.