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How to Install a Crawl Space Liner

So you’ve purchased a crawl space liner, and now need to install it.  Please understand we only guarantee the plastic film is of the highest quality.  We do not accept responsibility for the construction of the crawl space installation.  We simply want to provide tips to guide you through it.  One of our past customers made some incredibly informational videos we believe will help you get a better understanding of how to install your liner.

Once the crawl space is cleaned out and water issues are solved, the liner can be installed. The liner material comes folded and rolled on a core.   It is easier cut and size the material before you take into the crawlspace.  After the material is cut to size roll it up with the white side to the inside so that when you roll it out in the crawl space it stays clean.

Start with the walls. Attach the liner 4”-6” inches down from the top of the wall or sill plate with the 2 sided butyl tape (This is to leave a space for pest inspection). Do not remove the release liner on the exposed side until you are ready to attach the liner.  Remove the release paper from the butyl tape in about 4’-6’ increments.  The material should also be attached with some type of permanent fastener.  This can be accomplished using a Hilti or Ramset Powder Fastener or drilling a 5/16” hole and fasten it with Christmas Tree Ratchet Fasteners that press into the holes every 24” – 30”.  Install the fasteners thru the material and the butyl tape.

For the floor pieces measure and cut a piece of material wide enough to cover the floor from the wall to the 1st line of piers or supports.  Don’t forget to leave enough material to overlap the wall pieces 6”-12”.  Roll out and test fit the material.  Measure and cut the remaining floor pieces.  Again, don’t forget to cut the material long enough to overlap the piece next to it.   Roll out and test fit the remaining pieces.  Tip-at this point you can take off your boots/shoes to keep the liner clean or use set of disposable shoe covers to keep the material clean.

When you get to the piers or support posts you will cut and notch the material to fit tightly around the support.  Do this from both sides.  Again, don’t forget to leave enough material to overlap the piece next to it.  Wrap the piers or support post 6”-12” up from the ground.  Use the 4” white Vapor Tape to seal the material tightly around the supports.

Now smooth the material out from the supports to the wall and tape the seams with the  4” white Vapor Tape, making sure to overlap the seams 6”-12”.

This completes the liner installation.

 How to install a crawl space liner

How to install Foundation Pins

3 responses to “How to Install a Crawl Space Liner”

  1. Alan Janzen says:

    I have my main sewer line coming into the crawl space from under the foundation and running along the floor for about 20 or so feet before it gets to a branches up from an elbow connection. Its old cast iron sewer line. Should I lay the plastic floor liner on top of this and seal this in? Should I leave an opening for future maintenance needs?

    • Americover says:


      Thank you for your inquiry. We would recommend laying the vapor barrier under the pipe (if you can slide it under it) and notching the material around the pipe and securing it around the pipe with our butyl tape. This will give you access the pipe if you ever need it, hopefully you will not.

  2. Todd Goepferd says:

    Hello, My crawl space is only 24″ tall, and less than that where there are horizontal beams and ducts. As a result, I have to slide in the dirt to access the entire crawl space. I am concerned about pulling the liner out of place me as I crawl. Are there anchors that can be used to hold the liner to the dirt. I expect I would need to put tape over any perforations in the liner caused by the anchors.

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