The prevailing stock is 1970s through 1990s tract housing — bi-levels, split-levels and modest two-stories — plus older postwar sections. Economy three-tab shingles were the norm, and three-tab has one structural weakness that architectural shingles do not: the cut-out tabs. Each tab is an independent flap held down by a seal strip. When the seal strip loses grip through age and heat cycling, wind uplift gets under individual tabs and they crease and snap. A creased tab looks intact from the ground and is functionally finished.
Hail on aged three-tab produces the classic pattern we photograph here: circular bruises with granule loss and a soft, dented feel under thumb pressure, plus fractures radiating from the impact. On a roof already shedding granules from age, an inexperienced eye reads it all as wear. The difference is the mat — storm damage bruises the mat, and age does not.
A Stacker analysis of NOAA data found Cook County averaged roughly 78 severe weather events per year between 2010 and 2020, including about 17.7 hail events annually. On thin, aging three-tab, that frequency is why so many Streamwood roofs reach end of life abruptly rather than gradually.