We built in 2006 and this is what our contractor found when he was replacing our sunken in steps and porch because they built it wrong. Most of my neighborhood is having issues with theirs.
They didn’t put any moisture barrier between the siding and the wall board! Of course it took years before it started showing major issues.
They know by the point you find it the warranty will be past. The repairs are in the thousands of dollars!
Product or Service Mentioned: Ryan Homes Building Service.