UPVC French doors on a slope

10 Jul 2014
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United Kingdom
I'm replacing our garage door with UPVC French doors.

The bit under the doors is concrete (the edge of the garage floor) and has a slope to let water run away to a drainage channel in the driveway. So it slopes down away from the garage.

The slope is only about 15cm wide, but this is the exact location that the doors will go.

Will I be able to fit the French doors on this sloped area?

How should I measure the height of the opening? To the top of the slope? Or the middle?
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Thanks :)

Will the bottom sill of the French doors sit OK on the slope? Or do I need to somehow raise/flatten the slope?
The back edge of the cill will sit on the concrete, the front will need supporting possibly on a mortar bed
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If this is part of a garage conversion then surely the floor will have insulation etc - raising the cill height accordingly?
Also if a garage conversion building regs will probably want a footing under the door.

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