Cornell shingled my mansard roof in Oct 2010. Several weeks ago I noticed that some shingles had fallen out and slid down into my eavestrough exposing the roof deck.
With rain in the forecast I realized this repair should be done sooner rather than later to avoid more serious damage and higher repair cost.
After contacting Cornell several times I got a return call requesting exact address so they could repair the damage on Monday.
To make a long story short nobody showed up on Monday and despite many additional calls and emails Cornell did not return my calls or respond to emails.
Two weeks later after having another company repair the damage I've still not heard from Cornell.
The company making the repairs reported that whoever installed the shingles had not nailed them down in the proper spot and that was the reason why they came down.
Poor quality installation and no response for followup service.
I would definitely not recommend this company or ever hire them to do any work in the future.