I’ve got a 9 ft wide lift and slide door to install over a concrete slab, and the slab slopes about 1/8″ over that width in that location. Would you grind the high side or fill the low side in this situation? My primary concern is that the slab will eventually be polished as the finish floor, so nothing to hide a sloppy joint there. Thanks
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With the information given.
Trim the bottom of the sliding door and slide in the direction of the low side.
or, hang the door 1/8 out of level. In 9’ even I wouldn’t notice.
By the way, what’s a lift and slide door?
https://www.google.com/search?q=lift+and+slide+door
Since there is a base, it really would depend on what kind of base you will install? If the base is selected to be inset into the floor, then cutting will be needed anyway.
If the base will sit on top of the floor, you have a choice.
Polishing the floor will involve lots of grinding anyway. The end result will look better if you grind it level before installing the door. Finishing will have to address the edge in any case. Trim or a neat bead of sealant may come in handy at the edge of the track.
If you plan to have a service polish the floor, discuss with them and see what they suggest.
Hey there,
Most exterior doors are setup for installation on a wood subfloor so the bottom frame or threshold is high enough to receive the additional height of the finished floor. Since you are essentially setting the door on the finished floor, the door frame itself will already be sitting higher than normal.
I would install the door shimmed level on the slab, then make a small reducer to make up the height/gap. If this is an aluminum frame like most of the European lift and slide units you could have something made up in aluminum. If you are trimming the interior of the door with wood, than a simple wood reducer would be fine as well. Polishing first would be preferable and could make up some of the out of level condition depending on how much of a cut the floor needs. Either way though, I think you'll want/need a reducer at the bottom.