How to... concrete?

10 Jul 2014
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United Kingdom
The edge of our concrete garage floor where it exits the garage has a 15cm sloped section, to help water run away from the door.

We're replacing the door with a PVC French door and I need to straighten up the sloped bit.

My only concrete experience is pouring it into a hole to support the rotary dryer!

Can someone try to give a description of how I would do this job? Or a link to a good tutorial for something similar?
Like... how do I build a frame to pour the concrete in, so the wet concrete doesn't leak out of the bottom, and so it's level with the existing floor?
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7 Mar 2016
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The key to your question is where does the 150mm slope come in relation to the garage door jambs? A photo would show this relationship.
Is the new frame going from brick side jamb to brick jamb? Or is it going into the old wood(?) frame jambs.
If you are converting the use of the garage then any domestic floor should be
above external ground level, & safe from water ingress.

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