repair or replace exterior door sill?

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Old 11-06-19, 09:33 PM
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repair or replace exterior door sill?

On my back door, there is a bit of deterioration on the front of the door sill itself. I haven't poked around at it yet, so I'm not sure if this is just some caulking that was applied by the previous owner or a seal of some sort. What should I do?
 
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Old 11-06-19, 09:43 PM
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Looks like a mess. I think someone tried to bend a piece of vinyl siding under the door as a way of flashing it. This is the sort of thing that can't really be fixed very well unless you pull the whole door out. And if you pull the door out you might as well replace it. But you would want to get an aluminum sill nose extension that will clip into the front of your new door sill that will cover that area under the door better. And before you set the door in you will need some custom flashing bent to take the place of that vinyl. Or maybe a Suresill sill pan would work there. Then the door gets set in a bead of sealant when you go to install it
 
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Old 11-07-19, 06:48 AM
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Hard to tell exactly from the picture but it looks like there is a 1x4 running under the AL threshold that is deteriorating, that would be the first thing I would remove and see what is behind!
 
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Old 11-07-19, 07:02 AM
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Yes get in there and cut/chip or whatever that calking out of here so you can see what is going on.

Could be it is OK (no rot) and it is just a sloppy calking job.

I do see that your decking is very close to the sill. Also that the nails are further back so I am assuming that the joist is further back. If this is correct then I would cut the decking back an inch in front of the door,
 
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