If you're looking to take care of a garage door that's in need of repair, it's important to know how many C4 charges you'll need. Depending on the size and weight of the door, as well as the extent of the damage, you may need anywhere from 2-6 charges.
For a standard sized garage door, two charges should be enough to cause significant damage. If the door is particularly large or heavy, you may need three or more charges for optimal results. And if the door is already damaged or weakened, it may only take one or two charges to cause serious destruction.
In any case, it's always best to err on the side of caution and use more charges than necessary. This will ensure that your garage door is completely destroyed and will not pose any further danger or inconvenience.