[Speckert]

When I bought the house it had a hollow core interior door from in the house out to the garage. Not cool.
Installed a new exterior, fire rated door. The trim and the metal threshold extend past the foundation about 1 7/8". See pic. Am I correct in thinking that I can take a piece of treated lumber, adhesive and lag bolt it to the foundation under the over hanging parts and support it. Would this be an acceptable fix? Other ideas?

 

[kwikfishron]

You can do that. I’d use tapcon screws instead lags though.

 

[Ron6519]

You could also use a composite material as the lip of the threshold wouldn't require that much support.