Pier and Skirting Foundations - Ground Cover

Detail ID 2.0202.3
Topic
Moisture
Subtopic
Ground Vapor Retarders
Desired Outcome

Minimize ground moisture vapor and soil gas with a durable, effective vapor retarder

SF Single Family Site-Built Housing
MH Manufactured Housing
MF Multifamily Housing

Specifications

  • SF
  • MH
Specification Objective

Remove all debris that can cause injury or puncture ground vapor retarder (e.g., nails, glass, sheet metal screws, etc.)

Minimize punctures

  • SF
  • MH
Specification Objective

Cover all exposed soil

Extend ground vapor retarder a minimum of 6" up all foundation walls and piers, but do not install in contact with non-treated structural wood

Cover all exposed soil

Extend ground vapor retarder a minimum of 6" up all foundation walls and piers, but doDo not install in contact with non-treated structural wood

Create a continuous ground vapor retarder layer that does not compromise wooden foundation materials

Create a continuous ground vapor retarder layer that does not compromise wooden foundation materials

  • SF
  • MH
Specification Objective

Select a 6-mil minimum ground vapor retarder of 0.1 perm or less

Durable material selected

  • SF
  • MH
Specification Objective

Overlap seams a minimum of 12" with reverse or upslope lapping technique

For wall to floor connection, install the wall vapor retarder under the ground vapor retarder

Keep bulk moisture under ground cover

  • SF
  • MH
Specification Objective

Fasten ground vapor retarder to ground with durable fasteners

Prevent movement of the ground moisture barrier

View Sub-Topic:
Ground Vapor Retarders