Interior damage caused by faulty roof installation

[Shawn M Hannan]

Hello All,

I'm wondering to whom I should turn for guidance in the following scenario.  I had a roofer do a tear-off and new roof installation of a flat roof on a 3-story townhome in Chicago last summer.  As far as we know, the roof performed satisfactorily for several months, but winter precipitation has brought two leaks to light.  There has been some significant interior damage as a result of the poor roof installation.  My question is who to bring in to determine the full extent of the damage.  Of course there are obvious issues with both wall and ceiling drywall, but I don't know to what extent we should "tear things open" to find less obvious damage.  Do I hire a "public adjuster"?  A general contractor?  Someone else?

Thanks BP Community!

Shawn