They can reinforce any bad areas and install it right over the existing shingles.

This will reinforce that you are the guy to go to.

If your base mat foundation was properly reinforced (engineered to account for surcharge pressure from expansive soil), the rigidity of the foundation will minimize the displacement of the structure due to vertical and horizontal movement of the clay.

I have just listened to "The Richest Man in Babylon".It was very good, story, lessons and it reinforced alot of good ideas.Highly recommend it.

A longer answer would get into group psychology, about how a group reinforces self serving ideas, Collective rationalization, Stereotyped views of out-groups, etc...

Like an athlete it is good to reinforce the fundamentals but I don't ever buy the upsell.

The friendly, reinforcing community you have grown is a watering hole of knowledge and a web of networks; a true gem. 

Also, reinforce framing at inside corners with screws.

It never cease to amaze me how screwed up this industry is sometimes so I would like to reach out to all BP members and reinforce that one's reputation is like fine china, once its broken, no matter how well you put it back together it will never be the same.A few years ago, I had a discussion with someone how told me that they really hated real estate people because they all lie and mislead you.

"The wall will continue to move if it isn't reinforced, but may take decades to actually cause a structural issue.