My father is installing a pocket door, and he has to narrow the doorway by 1 inch on the pocket side of the pocket door. He has 3/4" oak strips he'd like to use. He was thinking of using 1/4" plywood or
1/4" MDF to make up the difference (it won't be visible as the trim will cover it anyway). I'm wondering if either the MDF or plywood will rot/warp/fall apart over time, and how it should be treated prior to installation.Thanks
John