Be sure foundation vent holes are usually not blocked by vegetation or hardscape. This could induce lack of air flow and result in higher humidity inside the crawl Area. The chemical DPC will enter precisely the same pores and capillaries that water would journey through. This varieties a waterproof barrier. https://dampproofing21100.tribunablog.com/the-smart-trick-of-rising-damp-that-no-one-is-discussing-46715913