DIY Tip of the Day: Caulk Storage Shelf. Caulking tubes can be difficult to store—they fall over if you stand them on end, and roll away if you lay them flat. Drill 1-in. diameter holes 2 in. apart in a scrap of wood, and screw the shelf to a flat surface with space below. The weight of the caulk at the tip of the tube keeps it upright.