Step 1 · Measure Banister Gaps

Using a tape measure, carefully measure the width of each gap between the vertical spindles of your banister, as well as any gaps between the spindles and the top handrail. Record these measurements to identify the largest gap, which will dictate the size of the material you'll need to purchase to ensure no child can fit through. Also, measure the total length of the banister that needs to be covered.

Tools and Materials