21.   This will kill the mildew, which, if moisture is not trapped behind the sheathing, may not grow again.

22.   You may have no trouble if you do it the other way, but there is always the possibility of trapping moisture between the paper and the floor.

23.   Decaying straw and leaves trap moisture and keep out most weeds.

24.   Fog developed in areas of the Great Lakes and upper Mississippi Valley where low level moisture was trapped.