On 8/18/2018 3:11 PM, Davej wrote:
....

My thoughts are to cut off the bottom several inches of the 2x10's and
fill that with something like polyurethane caulk. Then install a new
threshold on the basement-side of the floor crack, and then a new door
frame.

I'd try to get the remnants of the ends out of the holes and then fill
with sand mix. If just fill over the ends will end up w/ a cavity to
pond water.

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