Aluminum threshold is off

[blaubner]

I just installed a storm door and the existing aluminum threshold is short by at least an inch. What are my options here? Should I remove the existing threshold and install a new one? I don’t think I could move the existing threshold and still have a seal on both doors.

[A. Spruce]

Look for a rubber sweep that can be attached to the door to cover the gap. You may have to find a specialty door supplier, it isn't likely that the average big box will have what you need.

I have the same problem with my security screen door, this was the solution:
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I also have to say that this repair was not done by me, so I don't know where the sweep was found, it could have been modified, I do not know, but it at least gives you something to look for or maybe find something to modify on your own.

[Shannon]

I had that same problem a few years back (but not that big of a gap) I found a door sweep that screwed to the inside face of the door and filled the gap. You may have to get creative and stack two together to get that to cover?

[blaubner]

Both good options. Thank you. Shannon, did the additional sweep interfere with the closer arm? I’m waiting to install the arm until I figure out this gap.

I’ve also thought about “extending” the threshold by installing a piece of wood on the deck flush with the exterior wall. Not sure how that would look though.

[Shannon]

In my case it did not, you have adjustment in the closer for some extra needed closing speed if needed.
You could do that with wood just keep it to a min. as it may be kind of a toe stubber for most people