Couple minor repair questions:
Backdoor to porch has a puncture that looks like some idiot opened it into their knee. The previous owners didn't patch it up so whatever is filling the door is now rotted and squishy. I was going to patch the fracture(it's plastic) with silicone, just wondering if there's anything else I should do before that.
The aluminum siding panel where it meets the flashing at the porch is loose. You can see loose pieces of styrofoam and plant matter underneath the panel. Anything I can besides sealing it up with silicone? Worried about trapping plant matter in there, but I'm not sure how to clean it out with bending the siding a lot and removing whatever's left of the styrofoam.
Confused by the door part. Nearly all wood doors that would rot have no plastic, unless around a window casement. All metals doors have plastic around the same casement but usually lack much wood to rot except at the sides for support/stability. Most used to use a cardboard corrugated core , now many use foam. Either way you can fill in that void some is you can access the inside of the door through a hole or whatever and use a NON EXPANDING foam. Do not use expanding foam. Use the kind meant specifically to fill voids without expansion pressure or you will buckle the door. Then seal up.
On a properly built house you will have at the sill plate( wood secured to foundation for framing of the house these layers. Studs/Sheeting which is ply, brick board or foam board, house wrap, additional insulation if siding ( much thinner than the first ) then finish cover which is board, siding,brick, rock.
The reason it is loose is all siding is nailed at the top. There SHOULD be a nailing strip the bottom of that panel snaps into it. Either they skimped on it, or it has fallen off or simply come undone. It will basically look like a 2-3 inch piece of metal at the same level as the bottom of the siding nailed into studs. The siding snaps onto it preventing it from being loose.
Now if it is just flashing and was never there, then that was some piss poor work done by the siding guys, but not all that uncommon, these days I've seen it all.
Vines and plants grow up underneath stuff like that all the time, simply cut and pull out what you can, what remains will eventually rot away if the growth is thick ( >1/4 inch thick ) you will want to remove it simply from crimping/damaging the siding. It is meant to be flat to the wall.
As far as securing it without a nailing strip, exterior adhesive may be your best bet, like liquid nail or along those lines and keep plant growth from reaching it again.
Mko, it is hard work. I find a 2 or 3 lb sledge works best( the short smaller version of the murder weapon ) unless you do like I did last week and miss the chisel and hit your hand, in which case I suggest explosives.