Rotten Door Threshold Repair Question

[PottedMeat]

I need to fix a rotted out external door threshold on concrete/brick and ran into this:

The builders built up a ~1" high concrete mound to put some split brick so the aluminum threshold would transition to brick to the ground. The mound goes all the way across the door. So there's a ~1" deep channel between the mound and the flat indoor foundation ( I don't know if it goes around the house ). It was filled with dirt/mud/insects when I took the old sill out. There doesn't seem to be any way for trapped water to escape. Can I fill it with concrete or expanding foam?

 

[ric0chet06]

Concrete for sure, the foam will just absorb and hold water forever. I just did some work under a house, apparently their kitchen sink was leaking and about a 3' x 3' area of spray foam insulation was soaking wet from the leak, soaking everything it touched.

 

[PottedMeat]

Concrete for sure, the foam will just absorb and hold water forever. I just did some work under a house, apparently their kitchen sink was leaking and about a 3' x 3' area of spray foam insulation was soaking wet from the leak, soaking everything it touched.

damn, didn't think the foam could soak up water.

any other suggestions? i'll get wood epoxy and cut some bits of pressure treated lumber to fill in the rotted sections too.

 

[x-alki]

Some foam will absorb water. A closed cell foam wont. I wouldnt use foam though. Are you handy enough to clean the area up, level it out and use bricks?