Why Hollow-core Doors Should Be Replaced

Hollow-core doors are too easy for burglars to break through. You want a door that presents a solid and sturdy front to your home. Even solid wood doors less than 1 and 3/4 inches thick may not provide enough of a deterrent to a determined thief. Better choices are solid wood doors approximately 2 inches thick or metal reinforced doors--metal is the superior choice. Metal-clad doors are the most secure because the steel exterior over the wood makes it very difficult for intruders to bust down. When you're replacing your front door, don't forget to take a good look at side, garage, and back doors as well. A strong front door might not be any help if you have a flimsy back door.

Reference: Replacing Hollow-Core Doors