Step 4: Doing It
If you're up for doing a lot of cutting and going back and forth you can carefully measure your crawlspace, work out a little diagram, and cut it piece by piece.
* Use the drill to make holes in the concrete. Hold up the furring strips and use them as a template for your drilling.
* Apply a bead of silicone along the top of your concrete blocks, this will be a watertight gasket that will keep the humidity rising out of the Earth down under the barrier.
* Arrange the tarps so that once they are screwed in place behind the furring strips they will drape down the wall and onto the ground.
* Spread everything out evenly and cut away excess in as big of pieces as possible. These pieces we ended up using in patching holes where needed.
* You'll want to overlap any cuts by at least 1 foot. In many instances I ended up with 2 feet. You can use HH-66 to seal the joints, but I chose not to. I know that the water line running into the house has been in the ground since the early '60's and that the huge old cast iron drain will need to be replaced so I didn't want to have to cut and patch later. You can use housewrap tape if you wish, but my overlaps were so big that I didn't bother with either.