Next step is to prepare the liners for the holes. The major purpose of the liner is that it you will be able to take out the bees when they are hibernating, inspect them and clean them up. Mites are also a problem amongst the Mason Bees. You will sometimes have to clean the holes of these pests when there is major infestation. The use of liner facilitates all that. You can pull the liners easily from the holes, open them, and clean up if needed and then place back again. You can also have the dormant bees tucked inside the liners and ship them off to friends who would want them, or you can sell them off. Because we are using liners for the holes, we drilled holes that are slightly bigger in size that are recommended, so that when we place the liners, the final hole size is perfect for the Mason Bees.
One of the best recommended liner is the Reynolds Parchment Paper. There are other liner papers that often have waxes on them but they are often chewed by the bees and defeat our purpose of using them. There have been no reports of other problems when using Ryenolds Parchment paper. Buy the size that is 15" wide so that it can be cut into 3 pcs of 5" x 6 1/4" sections.