Hurricane Garage Door Wind Load Post The top has a metal piece that is bolted to the wall above the garage door. The bottom has a post that goes into a hole in the floor that needs to be drilled in the concrete. There are 3 other pieces with pins and steel loops that secure it to your garage door. The only thing holding a garage door to the house that is not reinforced is the tracks. If the tracks give out with the door compressing and compacting, your garage door blows out. It needs something behind the garage door to reinforce it to keep it from coming out of those tracks. That is what this wind load post does.