Place a piece of weatherstripping
First you need to cover the latch. Cut a portion of weatherstripping and place it behind the handle.
In case it stuck when the door closes then you need to cut out the extra piece. You can do this with the help from snap-blade cutter of you can simply turn it.
Apply brad nails to attach
Next you need to attach the weatherstripping to the door. You can do this with the help from brad nails which are formed from 18 gauge wire.
Cut weatherstripping to place around handle
After applying brad nails, you need to cut pieces of weatherstripping and place on the side and top of the handle.
Apply pry bar
Place a pry bar under the wood edges around the door. Remember to put the pry bar from inside the house.
Spray foam sealant
Next you need to spray the foam sealant. Do it in the area between the door and the wall.
Follow the instructions on the sealant to apply and then leave it to dry.
Flush the dry foam
After spraying the foam sealant between the door frame and wall frame, you need to cut the excess foam. You can do this with the help from snap-blade cutter or you can also cut the excess with knife.
Replace the trim
In the end you need to change the trim. You can do this pressing the nails back to their original positions.