Old house, with poorly installed exterior door on top of renovated old garage which leads to deck. I'm installing a waterproofing system, and I could probably flash in almost every place but not sure how I would in the door threshold area. I assume most properly-installed (or preassembled doors) flash as part of the installed threshold and the overhang of the door install. I don't have this. Don't think they make a sill pan or threshold (biggest I've seen is 7 13/16) that would fit this. Do I have any options to flash my deck at this threshold or do I have to do the non-flashing-but-not-watertight install method of the waterproofing system?

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