We have an 1899 Eastlake Queen Anne on a pier-and-beam foundation in the northeast part of Texas. A foundation inspection by a structural engineer unsurprisingly indicates a need for re-shimming. He also recommended completion of a plastic sheet ground moisture barrier that currently covers about half of the area under the house. However, multiple foundation contractors have told us that the moisture barrier is not necessary and may even be detrimental as it prevents the soil from drying fully. To cover or not to cover, that is the question!