Step 1
Measure the height of your baseboard heater with a measuring tape.
Step 2
Turn the bookcase on its side on a work surface. Measure the bottom of the case with a measuring tape.
Step 3
Purchase hanger-bolt-equipped furniture legs that are at least 3 to 4 inches taller than the top of the baseboard heater.
Step 4
Purchase a 1/2-inch gypsum panel the same size as the bottom of the bookcase. Have the panel cut to size at the home improvement store when you purchase it.
Step 5
Fasten the gypsum panel to the bottom of the bookcase using a drill and drywall screws long enough to pass through the panel and into the base of the furniture. Drive a screw every several inches, leaving the corners free so the screws won’t interfere with placement of the furniture legs.
Step 6
Measure the length of the hanger bolts on the furniture legs with a tape measure. Drill holes the same depth in the corners of the cabinets using a drill and drill bit that has a slightly smaller circumference than the hanger bolt. Make sure the holes extend through the gypsum panel and into the bookcase.
Step 7
Screw the furniture legs into the holes you drilled.
Step 8
Lift the bookcase, then right it before carrying it to the wall. Lift it to reposition, if necessary. Hanger-bolted legs are strong enough to support weight that bears straight down, but they may loosen if you drag the bookcase or tilt it on the legs.