Gap under sliding patio door

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JustinV

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Nov 27, 2017
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Hello all. :) I'm new to the forum and need some help/suggestions with a particular issue.

I recently had two new sliding patio doors installed in my second floor condo (built in 1979 if that's of any help). When taking out the old frames (while I was at Lowe's trying to get the hardware that was missing from one of my doors :mad:), one of the installers accidentally broke apart the concrete gap between the patio floor and the door. Here's what the other concrete gap that didn't get busted out looks like: https://photos.app.goo.gl/g3veiaSDuapfgOI62

Here's pictures of the gap in question:
https://photos.app.goo.gl/H0lldXYUTee3l6y73
https://photos.app.goo.gl/O9DVV0Cle7m0WYs12
https://photos.app.goo.gl/4rmIBRIkAOCeVeMP2

Here are some measurements:
https://photos.app.goo.gl/fTy9K023qQutz6Mv1
https://photos.app.goo.gl/G3PxF4qb1Am4ze7o1
https://photos.app.goo.gl/UJhyMq9kQAaLELIg1

The gap is about 2 1/2" deep, almost 1 1/2" high and across the whole door (6 feet). The installers told me to just slap some concrete under it. At the time, I thought it would be fairly easy to do, although I've never worked with concrete before (I have laid tile, hung sheetrock, etc). My major concern (as I read up about concrete) is expansion and contraction between the new concrete, the old concrete (patio floor), and the bottom track of the new doors.

I'm, also, concerned with getting the concrete all the way up to the bottom of the door's track for support, as I recently realized the static door doesn't have much support under it right now. The questions that I can't seem to find answers to would be: Should I use mortar or concrete? What type and brand of it should I use? What's the best way to install it so I don't end up with air gaps under the door (for support)? I wouldn't need any rebar in this small of a gap, would I?

Any suggestions would be a HUGE HELP AND GREATLY APPRECIATED!!

Thanks so much and have a great day,
Justin
 
Last edited:
I go back to lowes and demand the part they broke talk to the manager and then the district manager. that's what I had to do on a window they shattered.
 
I'm new. I didn't know whether to put it under the door thread or concrete thread, so I put it in both. Is that wrong?

It just adds confusion and people ask questions that have been answered already or make the same points as others with out knowing. :welcome:
 
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