Valley leaks
Where two roof slopes meet
Skylights reach a point where reflashing is not enough — a rotted frame, a failed sealed unit with moisture between the panes, or a unit old enough that compatible flashing is no longer made. Replacement is roof work as much as window work, because the flashing kit and its relationship to the surrounding courses is what keeps water out. A new unit fitted with old or improvised flashing leaks exactly like the one it replaced.
Normal gets the full range — freeze-thaw cycling through winter, severe convective storms with hail and straight-line wind in spring and summer, and enough temperature swing between them to work every joint on the roof loose. Freeze-thaw is the quiet one: water finds a hairline gap in flashing, freezes overnight, expands, and opens it slightly wider, repeating through a McLean County winter until a joint that was watertight in October is leaking by March. Spring brings the loud damage, and derechos have put straight-line wind through this region at speeds that take ridge caps and whole shingle courses. Housing stock here is older than average, which means a lot of roofs where the flashing has already been through several decades of that cycle.
Normal has a population of about 52,736, and the housing stock here sets the pattern for what fails first on a roof.
On some units yes, where the sealed unit is a serviceable part and the frame is sound. On older or sealed-frame models the whole unit is the replacement item.
The courses around the opening have to be lifted and reinstated regardless, so it is worth checking the surrounding area while access is there. On an older roof it is often sensible to do both together.
Where two roof slopes meet
Concrete and clay tile
Single-ply flat roof membrane
Rubber flat roofing
Bruising and granule loss
Clearing, repair and replacement
You will get a straight answer on whether Normal needs someone out today or whether it can wait — before anyone quotes you for anything.
Call (706) 696-1888