This is not a DIY repair site. You might hire someone to inspect and answer your questions. Besides how would anyone know what material is being used when they only have a photo to decide. Really?
With all of the problems you are having with your new home I would advise you to hire a local Inter-Nachi Inspector. Use Inspectorseek.com to find a qualified inspector in your area who can perform construction phase inspections on your project. You will be glad you did.