Once the peirs are in place, the cracks (vertical ones) need to be ground out and filled with backer rod and sealant. 

You can see the plywood sheathing, evidence of past/present water damage, coping replaced by some sort of spray foam sealant, etc -est repair $10,000. 

However, please make sure they put sealant on all the nails of the dish and around the base of the dish.  

The felt alone is $20/ 4 Squares, Cheap shinges will start at $55/square, drip edge $1/ LF, Flashing, sealant, nails, nail caps,  Labor will start at least $75/square if you buy the material.  

We have tried multiple different things short of digging up the front yard but the water flow is strong enough to knock and sealants out of the way. 

Make sure you flash properly the roof to the wall and not just sealant. 

I think you over thinking this in general and not worth it.A  non-curing butyl sealant. 

They have mostly been sealed with a caulk or other form of sealant.

GOOD sealant goes a long way.

As far as I know he didn't test the water heater with it actually ignited.I ordered an OEM ignition system for the hot water heater, and in the meantime put some gasket sealant on the plug, and hooked it back up.Well, 4 days later I get a call from the tenant saying the entire house smelled like gas again.