Home Improvement Questions? Ask a Handyman for Answers
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Looks like you have a beam above the existing post. Will the door fit under the beam?
Ok, my question was related to not messing with the beam. If you need to cut the door down that's up to you. The new post on the other side would not be structural so you only need it for nailing. Best way to secure it at the base/slab is to let it sit on top of the slab and use a String Tie angle bracket to secure it. I'll find you a link to a typical one give me a few.
Here is one optionhttp://www.homedepot.com/p/Simpson-Strong-Tie-3-1-4-in-18-Gauge-Gusset-Angle-GA2/100375243
Yes, drill into the cement and use TapCons (blue cement screws). Probably best to put a square post on either side since the post I see is far from square. You only need posts on either side of the jamb.
The posts on either side should be the depth of the jamb (looks like a ~6" jamb) so you can use doubled up 2 X 6's on either side. Other than securing the posts top (into the beam) and bottom (with the angle bracket) it's just like any other pre hung door. I assume you've hung pre-hung doors before. You'd make the opening at least an inch bigger so you can shim the door plumb.
That's eaxctly how you do it. With the Strong tie brackets. They are more than enough.
Of course you want you posts to fit tight to the floor and beam
The last thing you want to do is bust into the slab. Those TapCons are far from flimsy. I don't know what size you use but no way you break off a #12 Tapcon. I've put in much bigger doors than this. I'm not going to argue the point. You asked for expert advice and that's my advice based on 40+ years in the building & remodeling business.
Do you have more questions?
Ok, fair enough.