How to level garage floor threshold?

[CelebrationSport]

I’m in the process of looking for a new roller door to replace the two singles I currently have. Before I get a new door installed, I need to sort the level of the garage floor at the threshold/opening.

Here the garage in question:



Sorry it’s not the best picture, but you can tell the LH door sits lower than the RH door.

Where do I start with trying to level it out? I would guess there is a 2-3inch difference in height from left to right. I’m thinking that grinding the RH side down to level the opening might be best? Dont want to add material if I can help it due to the upward slope into the garage.

Will get better pics if needed.

Edit to add more pictures.



Thanks!

Edited by CelebrationSport on Monday 22 April 19:24

[IJWS15]

I have seen roller shutter doors with a tapered bottom section.

You may also be looking at an industrial door to get the width and (my father has one) the big ones rattle when it is windy.

[CelebrationSport]

IJWS15 said:

I have seen roller shutter doors with a tapered bottom section.

You may also be looking at an industrial door to get the width and (my father has one) the big ones rattle when it is windy.

Roller door place I visited last week said they fit them square and don’t cut the last slat to suit floor level. There is a weather seal that will help with small undulation but much more than c.30mm. They recommend I carry out remedial works to level the floor.

Door opening is 4.769 x 2.319m. They said they said 5m is no issue.

Cheers

[M1AGM]

Where is the internal floor height in relation to the front, does it run true or follow the slope?

[CelebrationSport]

M1AGM said:

Where is the internal floor height in relation to the front, does it run true or follow the slope?

As in front to back? It’s pretty level. Beyond the threshold the concrete slopes down slightly into the drain gulley.

The garage was originally a single. The last owners converted it to a double. The result of which seems to be a slight difference in between the old floor (LHS) and new floor (RHS) which gives an a slight slope at the threshold.

Thanks

[M1AGM]

Gotcha.

If it was mine I would level the floors and build a threshold to that.

What about something like this to cover the gap?

https://www.stormguard.co.uk/stormguard-products/r...

[Simpo Two]

That threshold is comedy gold; I can't believe even a builder would do that. But they evidently did.

I would want a level threshold, so perhaps a man with a 12" petrol angle grinder and hammer/chisel could get the excess off, then screed to a good finish.

[OutInTheShed]

One option is to raise one side and lower the other.
That way it becomes two jobs of sensible dimensions.

Lowering the approach on the RHS by 30mm is much less than half the work of lowering it by 60mm.
Likewise raising the LHS.

A true bodger would raise the RHS by 20mm, lower the LHS by 20mm and taper the door by 20mm...

[Simpo Two]

OutInTheShed said:

One option is to raise one side and lower the other.
That way it becomes two jobs of sensible dimensions.

Lowering the approach on the RHS by 30mm is much less than half the work of lowering it by 60mm.
Likewise raising the LHS.

True but OP says 'Dont want to add material if I can help it due to the upward slope into the garage.'

[OldPal]

I know you’re reluctant to raise the left hand side but I think it would be easier to just raise it and sweeten the height away over the length of the drive. It would only be the same height as the rhs which would be hardly noticeable if swept over the longer distance of the drive