The reasons your garage door has a gap in it could be.
Gap across bottom of garage door springs.
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This is not always the case though.
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.
Retest the door balance as you did in step 1.
Adjust the springs on both sides of the door the same way.
You may consider looking into what has caused the one side to settle.
Garage door sensors may not be aligned correctly 3.
If it was opening too quickly move it to the next lower hole.
Sectional doors and hinged doors are adjusted using a basic procedure for.
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Garage door opener malfunction or door has shifted.
If your garage has torsion springs across the inside of the door opening you need a professional to adjust the tension.
Start by disengaging the door from the automatic opener track so you can work on the cables.
Or you may be able to cut a taper off the otherside where the floor is high if you have enough door at the top to alllow it to drop that much.
If the door was closing too quickly move the spring to the next higher hole on the bracket.
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.
Garage floor may have cracked or shifted 2.
You will need to attach a taper shaped peice of wood to the bottom of the door unless someone knows of another product.
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.
First you need to see what has caused this to happen.
There are times and instances where the garage door will not quite seal to the driveway leaving a small gap.
This will help you create a flat and level surface so the gap will close.
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It s also actually easy to do.