The cheapest option to just fix the gap would be grind out a channel in the concrete, near the center, to allow the door to fully close into this channel. Wear a respirator or mask. Grinding down the whole hump would be unnecessary to close the door, and its a lot of material to grind.
Check the cables on each side of the door and make sure that they are not frayed or damaged. If one of them is frayed then it will cause an uneven pull when opening and closing. The door will gradually shift to the side with the greatest amount of tension.
Your garage door should sit flush with the ground when closed, allowing no light to enter from outside. If yours doesn't, you can consider a few different ways to adjust the gap at the bottom of your garage door.
If your garage door leaves a gap at the bottom, this is an invitation for rodents and insects to make a new home inside your garage. A gap under the garage door will also allow cold draughts, melted snow and rainwater to enter your garage while the warmth from your home escapes through that same garage door gap.
DIY Techniques to Fix Garage Door Alignment
Use a screwdriver to loosen the screws that hold the tracks to the door frame. Align the track with a rubber mallet so it is perfectly vertical. Retighten the screws and complete on the other side.
Your Door is Misaligned
If you notice that your garage door appears loose or uneven while opening or closing it, this could be a sign that it has come out of alignment. Misalignment can result from broken springs or frayed cables on one side of the door and requires immediate repair.
You can use a pair of pliers or a hammer to help straighten the track, but make sure not to apply too much pressure as it may cause it to break. Once you have successfully straightened the track, check its alignment using a level. If it's still slightly uneven, gently adjust it until it is straight and level.
Garage doors rely on various springs to help them open and close with ease. If one of the extension springs is broken, it can make the door go crooked so it doesn't close all the way on one side. A quick visual inspection should reveal whether any of your garage door springs are broken.
For gaps along the bottom of your garage door, the problem may stem from worn-out or chewed weatherstripping. You can find weatherstripping kits at your local hardware store. Measure the trimming twice to ensure it fits the length of your garage door, then cut it to size and install it following the instruction manual.
On average, homeowners can expect to pay anywhere from $100 to $500 for a garage door adjustment service.
Loosen the outer nut (the nut closest to the garage door) until the chain droops below the base of the rail, then loosen the inner nut to allow room for the chain to be tightened. To add tension to the chain, tighten the outer nut. With every turn of the outer nut, the chain will rise slightly.
Misaligned tracks. Garage door tracks guide the rollers to open and close within the door frame. If the tracks aren't perfectly aligned, it'll place stress on the door, causing it to bend.
Force Adjustment controls are located on the rear panel of the Opener. The force adjustments regulate the amount of force required to open or close the door.
Fixing a Misaligned Garage Door
Binding garage doors: A binding garage door happens when the door is nearly impossible to operate. To fix a binding door, begin by loosening the screws that secure the track to the garage door frame. Then, use a rubber mallet to reposition the track to its proper placement.
Check Alignment: Use a spirit level to ensure the door is straight. Secure Hinges: Tighten the screws with the shims in place to hold the door firmly.
Alignment. Your garage door can get out of alignment in several ways. It can happen on its own naturally over time, or something may bump into the door and make it unbalanced. If your garage door needs an adjustment, this service will cost about $150 to $300 on average.