The obvious question is; what were you doing storing something in the crawl space under your home? And, if it was something other than a fine vintage wine then the fact that it has a musty smell doesn't surprise us.

While we suggest that you make every effort to keep the crawl space under your home dry, it would be unrealistic to assume that this area is too damp just because something that you have stored there smells musty. Furthermore, although clever, we believe that the plant moisture meter may not be the most reliable testing device in this situation, especially since you are dealing with such a vast area. None the less, the fact that the moisture meter measures eight is not alarming. Excessive dampness in the crawl space could result in mold or mildew on the walls in your home especially if there is poor air circulation throughout the house.

Since your home is less than one year old its' construction was subject to current building codes. Hence, there should be adequate ventilation in the crawl space to minimize the amount of moisture there. However, even with proper ventilation there are several other steps that you must follow in order to keep the space dry.

First, make sure that all of the soil that surrounds the perimeter of your home is graded or sloped away from the foundation for at least three feet. This will prevent surface runoff from traveling under the home. Secondly, if your home doesn't have rainwater gutters we suggest that you make this one of your pre-winter home improvement projects and install them around the entire house. It's also important that all rainwater downspouts be connected to a drainage system that will take the water out to the curb and into the city storm drain system. And finally, be conscious of your watering habits around the perimeter of your home. Too much water or sprinklers that spray up against the house will keep your crawl space damp due to capillary action. If you do the preventative maintenance as we suggest above your entire home, and not only your foundation, will be better for it.