It s possible that the concrete floor of your garage has settled over time leaving a gap between it and the bottom of the door.
Gap across bottom of garage door springs.
There are times and instances where the garage door will not quite seal to the driveway leaving a small gap.
Retest the door balance as you did in step 1.
Garage door opener malfunction or door has shifted.
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Start by disengaging the door from the automatic opener track so you can work on the cables.
If your garage has torsion springs across the inside of the door opening you need a professional to adjust the tension.
First you need to see what has caused this to happen.
This is not always the case though.
If it was opening too quickly move it to the next lower hole.
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If the door was closing too quickly move the spring to the next higher hole on the bracket.
Garage floor may have cracked or shifted 2.
Garage door sensors may not be aligned correctly 3.
It s also actually easy to do.
Sectional doors and hinged doors are adjusted using a basic procedure for.
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If this has happened to you you can add more concrete to the floor in order to bring it back up to the right level.
When a garage door is installed and for the lifetime of your garage door it should close and the bottom should seal to the bottom of your driveway.
This will help you create a flat and level surface so the gap will close.
If there s a gap at the bottom of your garage door when it s closed or the bottom edge is uneven when you close it you can correct the problem by adjusting your garage door cables.
Garage door seal may be damaged 4.
Adjust the springs on both sides of the door the same way.
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You may consider looking into what has caused the one side to settle.