Doors – How to use to fill big gap around door frame

door-framedoors

door frame
A door was replaced (due to break in). The contractor insisted to go to a bigger size door. So we went from 32 to 36 inch (which is more widely available). Now I see a gap of near 1 inch between door frame and what appears to be the stud near the key hole. The door is screwed with some long screws into the frame.

Is this OK?

What do I do with the gap?

1- Fill with foam

2- Try to fit in with wood. What wood type will not cause expansion and deformation of frame of door?

3- ?

Also,
near the door step I see newly exposed vinyl flooring in bad shape (something was covering this portion up before). What do I use to cover it up?

Edit:

In retrospect that gap was a very bad thing. Exterior is Hardie plank and we needed a storm door to protect this door from the elements. That storm door cannot be screwed to Hardie, it needed a stud behind the exterior. So fill the gap with equivalent of stud before installing the door.

enter image description here

Best Answer

With the deadbolt on the door, it appears to be an exterior door, so the space in the jamb should be insulated, both at the top and the sides. No need for a full roll of insulation to be bought, there are smaller pieces that can be bought such as fiberglas pipe wrap, or ask a person you know that may have a little on hand. It won't take much.

The drawing below will explain a bit on what to do about sizing material for the trim to cover the gap. Perhaps other trim that is throughout the house will give an idea how to treat the door. enter image description here

Perhaps the trim in your place looks like this? The sides of the door in this pic looks like the trim will fill the footprint in your flooring. enter image description here Carpet trim is what I Googled to find the strip to cover the edge where the flooring is cut at the door.enter image description here