Is it necessary to put down a waterproof membrane on a dry cellar in Maine?
Waterproofing systems post-construction are very expensive - almost triple the cost, so I would usually recommend it.
Where are they suggesting the waterproof membrane goes? And what system are they suggesting?
If it is for hydrostatic pressure (water entering from below the ground) and you live in a high water table area, ABSOULTELY.
If they are suggesting to coat the walls with a tar-membrane, save your money because these usually only last about 5 years.
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