Answers

Guild Quality is a 3rd party review platform that requests reviews from homeowners. I would imagine you set up a warranty through Owens Corning. They have recently partnered up with GQ to get the homeowners' unbiased opinion on how their experience was.

They have a excellent educational center 

Valarie they dont make them in white but you can get them in a mill finish for under $10

I am not familiar with Chula Vista Roofing Pros, but I am familiar with West Coast Roofing, Alex. He is always accomadating and takes the time to ensure his team is always giving each job big or small the best service they can.  

I agree with what Yuri said and would like to add that it is imporatant to have it removed properly so as not to cross contaminate. Mold spores are microscopic in size and easily dispersed if not handled correctly.

The leak and mold are time sensitive. Mold can be hazardous to your health. Dealing with mold properly means removing the sheetock and insulation once the leak is fixed. Don't let anyone tell you they can seal it in place and paint ove it. It must be removed. The foundation work can get vey expensive if you wait too long so don't put that off too long.

Hope this helps.