Step-by-Step Pictures and Instructions For Installing Baseboard Molding

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Problem 1: Wavy Walls and Built-Up Corners When you lay baseboard against a wall and see gaps between the top of the trim and the drywall, it’s usually because of a misaligned stud or a built-up ridge of taping compound over a joint. Both will create bulges that cause gaps. You’ll also find the problem at outside and inside corners, again caused by built-up taping compound. While you can scrape off small lumps with a putty knife, you can’t move studs or sand off the bulge of compound without creating a huge mess. It’s almost always easier to adjust the trim rather than to attempt any wall fixes.