Our home was built in the mid 60’s and we need to replace the back door The only problem, I understand,is that we have a concrete threshold. Can a “standard” door be installed and still use the existing concrete threshold or must the new unit be installed with its own threshold on top of the concrete?
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Depends. MY GFathers house in Wildwood NJ had a concrete threshold, because the back bay could flood during 'canes. The 4" high step helped keep seepage at bay.
You have water issues or maybe a reason for the height?
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You need an exterior door to seal all the way around from weather and air. Most exterior doors come all pre-hung in their jambs along with a threshold/sill. It should be installed as a complete unit.
Beat it to fit / Paint it to match