Answer: There are several methods out there to tape plastic sheeting to a concrete foundation wall when working in a crawlspace. What we recommend is taping (using double sided Butyl tape) the plastic sheeting (Dura Skrim films, Crawlspace 1800 or Vapor Block Plus 20) to the wall, then using a 1/4" drill, drill a hole through the vapor retarder, tape, and into the concrete or block, then tap a foundation wall pin securely into the hole. The plastic sheeting choice depends on several factors and the condition that exists in your crawlspace. Best bet is to give us a call, so we can help you decide what is the most cost effective method to use keeping your goals in mind.