Crawl Space: Step By Step How To

Step # 1 : Measure your crawl space length, width (in feet) and wall height (in inches) before placing your order. You can also contact us for help figuring out the square footage if odd shaped or just needing help.

Step # 2 : Clean out all debris, remove old plastic liner (if on floor), tie up loose or hanging cords, clean cobwebs and loose dirt from walls and floor joists.

Step # 3: Make sure the top of the sump pit (if in place) is the same level as the floor. Cut down if needed.

Note: Now is a good time to add drain holes in the pit or if you have drain tile to make sure water is entering the pit and to check the pump for proper float level and operation. Remove any debris from bottom of pit.

Step # 4: Make sure area is clean and as level as possible before installing the optional Drain Fabric and/or Liner.




Note: If installing the optional Pro Plus 100mil Drain Fabric, this is the time to install it. The drain fabric will help any water trapped under the liner to drain to the sump pit easier. Cut out around sump pit and foundation supports (piers) so that the drain fabric can lay as flat as possible, overlapping of Drain Fabric is not needed.

Step # 5: Roll out the STS Pro Shield Plus Liner on the floor along one wall with the foil side facing up (if installing by yourself you may need to work in sections, 10’ - 15’ or 20’, this will make it easier to move the liner into place). Starting from one corner (over lap about 1 foot around corner), lift the liner up and hold it against the wall with the foil side facing into the open crawl space. Place the top side of the liner as close to the top of the foundation wall as possible. Using the supplied concrete drill-bit, drill your first hole aprox. 2 - 3 inches from the top through the Liner and into the foundation wall, staying about 6 inches to 1 foot away from corners. Push in push pin (supplied) and tap in place with a hammer if needed. Some cutting may be necessary at the bottom of corners to allow the liner to lay flat on floor.

Step # 6: Continue drilling and installing pins along the top of the liner and foundation wall about 4 - 5 feet apart. Once the section is secure at top, start drilling and installing pins at the bottom of the foundation wall (6 inches off the floor is good) keeping the liner as smooth to the wall as possible. Let the excess liner lay on top of the floor. Over lap about 1 foot when going around corners. Making your corner seams at least 4 - 6 inches away from corners, makes it easier to apply the Foil seaming tape. To create a second and stronger seal on liner seams, apply optional STS Seam Lock between the overlaps of the liner before applying the Foil seaming tape.

Step # 7: After finishing all the walls, you are now ready to apply the Super Bond sealer along top of liner around foundation and piers. Fold down the 2 -3 inches above the top push pins and apply a 1/4 inch bead of Super Bond sealer, pressing the liner on to the sealer as you go.



HINT: Use the 1/4" drill bit ( provided ) to gage the hole size needed when cutting the tip of the flow tube for the STS Super Bond. This is a good guide for the bead size needed of the STS Super Bond to be applied.

Step # 8: You are now ready to roll out the liner (foil side down) for the floor. Over lap the excess wall liner that is laying on the floor aprox. 4 - 6 inches from the bottom of the foundation. This makes it easier to apply the optional STS Seam Lock and White seaming tape. Roll out the length of the crawl space floor, cutting around obstacles as needed. Make cuts as close to objects as possible making it easier to seal later. You can apply the optional STS Seam Lock and White seaming tape as you go or roll out the liner covering the entire floor and then seal with the optional STS Seam Lock and White seaming tape. Check to ensure all seams and specialty cuts are sealed.

Note: Overlap 6 inches on each row of liner you lay down on the floor. This allows room to apply the optional STS Seam Lock in seams before sealing with the White seaming tape.

Step #9: You have just completed sealing your crawl space and started improving the indoor air quality of your home. You can now enjoy the new addition to your home. It’s a clean, dry, mold free, insulated area that can now be used as additional storage space in your home.

Tips: There are several ways to work around objects such as pipes and piers (floor supports), but always make the cuts as close as possible so sealing is easier. Cut the liner around piers so that 6 inches or more is going up the pier. This makes it easier to seal and tape. For piers you could also cut the liner in to 2 foot strips long enough to go around the pier. Place liner so that1 foot is on the pier and 1 foot is on the floor, cutting the liner from the bottom of each corner of the pier out on the floor so that the liner will lay flat on the floor. Then over lap the floor liner, seal and tape.

When working around sump pit discharge pipe or other objects that maybe you can not cut, you can put a slice in the liner from one edge of the liner over to where the pipe or object is. This way you do not need to cut the pipe or move the object. Another way (if the sump pump discharge pipe is in the middle of the width of the liner) is to unplug the sump pump, cut the discharge pipe and position the liner over the sump pit and cut the hole out. Reconnect the discharge pipe with a rubber coupling (not included) or repair with a connector (not included) as required. After discharge pipe is reconnected plug in the sump pump. This is also a good time to replace the check valve (sold separately). Replacing an old and possibly leaking check valve could save you money in the long run. A leaky check valve allows the water in the discharge pipe to leak back into the sump pit causing the sump pump to cycle more often than necessary. Always use caution when unplugging or plugging in electrical devices in wet or damp areas! NEVER CUT A PIPE, CORD, CABLE OR OTHER OBJECT IF YOU ARE UNSURE WHAT IT IS OR UNSURE HOW TO REPAIR IT. CHECK WITH A LOCAL CONTRACTOR IF UNSURE OR JUST CUT THE LINER TO GO AROUND IT.

Our “STS Quite Clear Check Valve“ fit’s a 1-½ inch PVC pipe and needs to be glued in place with PVC glue. Remember to always use PVC cleaner and primer before gluing. Always use caution when unplugging or plugging in electrical devices in wet or damp areas!

There is also a video of this process you can view.

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