Cracking Floor Along Overhead

[EB.Bldr]

Was wondering if I may ask for some advise as to how to repair the concrete under and around where the overhead door meets the floor. The concrete has just had it's 30th birthday and the cracking condition was apparent when we moved in and the damage is progressing as the years go by.

My belief is that in the winter months the melting snow off the car is running down to the door and re-freezing and breaking up the concrete.

Here are some pics. Any help would be much appreciated.

 

[folgers]

It looks like the root problem is the lack of a expansion joint between the driveway and the garage floor. The long cracks that run parallel to the door are caused by the driveway moving up and down while being in contact with the garage floor. Those small cracks let water and salt from your car get under the surface of the concrete and do more damage.
Someone on here can probably recommend a product to patch the damage you have but you're going to have to saw a better joint between the two slabs so they move independently.

 

[EB.Bldr]

That does make sense. When we moved in here there was some major settling that had occured at some point. We plan on replacing the drive at some point should we remove a section of the garage floor too?

 

[folgers]

That does make sense. When we moved in here there was some major settling that had occured at some point. We plan on replacing the drive at some point should we remove a section of the garage floor too?

That wouldn't be a bad idea. I see your driveway has settled and cracked if/ when you remove it you'll find that the cracks in the garage floor run all the way through the slab and some pretty good sized chunks will fall loose.
It would be easiest to do in two pours.
You'd have to saw and jackhammer what you want to remove in your garage. Then drill re-bar in to the slab and use that to tie into and reinforce the new pour. After you get the garage done set up the driveway, but be sure to use a good expansion joint between the two.

 

[LegacyIndustrial]

Was wondering if I may ask for some advise as to how to repair the concrete under and around where the overhead door meets the floor. The concrete has just had it's 30th birthday and the cracking condition was apparent when we moved in and the damage is progressing as the years go by.

My belief is that in the winter months the melting snow off the car is running down to the door and re-freezing and breaking up the concrete.

Here are some pics. Any help would be much appreciated.

Check out this repair material, stronger than the concrete...
http://legacyindustrial.blogspot.com/2010/10/we-receive-many-requests-for-detailed.html

 

[EB.Bldr]

That wouldn't be a bad idea. I see your driveway has settled and cracked if/ when you remove it you'll find that the cracks in the garage floor run all the way through the slab and some pretty good sized chunks will fall loose.
It would be easiest to do in two pours.
You'd have to saw and jackhammer what you want to remove in your garage. Then drill re-bar in to the slab and use that to tie into and reinforce the new pour. After you get the garage done set up the driveway, but be sure to use a good expansion joint between the two.

Thanks. I'll deffinently keep this in mind. It was my thoughts that that would be the 'correct' way to do it.

My plans call for a good epoxy coat eventually. I really want to get everything set in place prior so the end result is perfect and last a long time.

The rest of the floor is in good condition minus a hairline crack and some small texturing in one are of the floor.

 

[EB.Bldr]

Check out this repair material, stronger than the concrete...
http://legacyindustrial.blogspot.com/2010/10/we-receive-many-requests-for-detailed.html

Good to know. I would assume we would need to assess how bad the damage is before we can make the repair/replace decision.

 

[EB.Bldr]

I do have one additional question if we are to cut and replace the area under the door.

I have seen in some garages that the area below the garage door is slightly lower, like a lip, below grade of the floor where the door rests. If we decide to replace this area should we keep the area where the door rests even with the floor or create that lower area?

If I am missing the proper terminology for this space I just dont know what to call it or its overall benefit. We dont have a current issue with water making its way from the outside back into the garage.

 

[folgers]

I have seen in some garages that the area below the garage door is slightly lower, like a lip, below grade of the floor where the door rests. If we decide to replace this area should we keep the area where the door rests even with the floor or create that lower area?

Yeah I'd call it a lip. The 6 or 8 inches of the floor that sets outside the overhead door.
We always slope it away from the door as a matter of practice to keep wind driven rain from puddling against the door's bottom. What we do is set the form board across the outside of the doorway at the same grade as the floor. Pour and strike off the concrete, then after it starts to set up a bit dig some of the concrete out along the form. Then use a hand mag to shape a slope up to the door. 1/2 or 3/4 inch of slope is all you need. It's not that hard but like everything a little experience helps.

Just to make sure that I'm answering your question... the door sits on flat concrete that's the same grade as the floor, any slope on the lip starts just past the outside edge of the overhead door.

 

[LegacyIndustrial]

Good to know. I would assume we would need to assess how bad the damage is before we can make the repair/replace decision.

If the slab is still good underneath and it's just the top I would consider repair.
If you hear hollow spots when tapping, it may be better to replace.