I use my 20′ x 20′ garage as my workshop.  I have decided tp replace my 16′ garage door with a wall that will have a double door.  The garage floor is at ground level of coarse with a 3′ interlocking brick sidewalk across the width of the garage (I had the driveway removed a couple years ago).  There is no water problem leaking into the garage as I installed drainage lines in my lawn when I remove the driveway.

Everything is 2″ x 6″ construction.  The garage opening header (which I don’t want to remove because of a steel beam that the header is attached to) is only 1.25″ higher than my double door casing, so I was going to set the door unit right on the floor and water seal with a good caulking.

Question 1: Any suggestions how to fasten the door unit to the floor?

On either side of the door unit (61″ each side), I was going to install a 6″ high cement wall and then build on top of that.  One idea that I had to help secure the door unit at the bottom was to install the door unit first.  Then drill two 3/8″ holes 2″ from the bottom of the door unit frame on each side, and install 6″ bolts protruding out the sides.  Then I was going to pour the cement walls right to the door unit frame which would encase the bolts and help secure the door unit at the bottom.

Question 2: What do you think of that idea, or do you have a better suggestion?

I understand that to get a good adhesion for the cement I have to gring off all the garage floor paint and get down to the cement and roughen it up a bit.  Then paint a ‘white liquid’ product (don’t remember the name) and por the cement on top.  This is supposed to get you a great seal. I will also drill holes and install bolts into the floor before I pour the cement to give the wall support and put in bolts on top of the cement wall protruding up to attach the wall base plate.

Question 3: Am I missing anything?

I would appreciate any comments. Thanks for your help.