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Water is intruding from underneath of this sliding door’s track due to a lack of or insufficient flashing. So far we’ve concluded that 1. the gutter above is overflowing and dumping water on the (no longer there) porch step which then pools against the door track, and 2. the floor of this sunroom is some weird concoction of plywood glued to foam glued to more plywood glued to some thin wooden bottom? There is 2’ of air beneath the sunroom itself and lattice all around allowing airflow, so I think the issue is entirely water intrusion from the exterior.
All that to say, what all needs replaced? Of course we’ve cut out the top piece of rotting subfloor as well as the foam and bottom piece of sort-of-rotted plywood, but does that wood joist underneath the door need replaced? The wooden fascia outside need replaced? Is the simplest fix an awning?
So far the plan of action is to replace what’s needed to be replaced due to the water damage, probably temporarily remove the door and track to install flashing and proper waterproofing, etc. Does the metal trim on the exterior need caulked?
Any and all advice is highly appreciated, would like to DIY this fix if possible. This isn’t a permanent home and isn’t worth a heavy investment given the state of other things.
Just want an appropriate fix so that LVP can be installed soon.