A roof is eight decisions, not one
Most roofing conversations start and end with shingle color. The shingle is only the visible layer. Underneath it, a roof is a stack of components that either work together or fail together.
It starts with the deck, the structural sheathing that every fastener depends on. Soft or delaminated decking will not hold nails to spec, and nothing installed above it can compensate. Then ice and water shield, a self-adhering membrane at the eaves, valleys, and penetrations, where meltwater backs up and concentrated flow overwhelms ordinary underlayment. Then synthetic underlayment across the rest of the field as the secondary drainage plane. Starter strips at the eaves and rakes give the first course of shingles a sealed, wind-resistant edge. Field shingles cover the plane. Hip and ridge caps close the intersections. And flashing handles every place the roof meets something that is not roof: step flashing woven into sidewall courses, counterflashing let into chimney masonry, drip edge at the perimeter.
That is eight separate decisions, each with a written spec. On tear-offs we walk the deck before anything new goes down and replace sheathing that will not hold a fastener, rather than papering over it. Water is patient. It finds the one decision that was skipped.
Ventilation decides how long the roof lasts
A shingle roof is designed to breathe from below. Intake vents at the soffits pull outside air in, and exhaust at the ridge lets it out. The two have to be balanced, because exhaust without adequate intake just pulls conditioned air out of the house through every gap in the ceiling plane.
Poor ventilation shows up differently by season in central Ohio. In winter, a warm attic melts the snowpack from underneath; the meltwater refreezes over the cold eaves and builds ice dams that push water back under the shingles. In summer, a sealed attic can run far hotter than the outside air, cooking shingles from below and aging them early. Year-round, household moisture that cannot escape condenses on the underside of the deck and slowly degrades the sheathing and insulation.
We calculate intake and exhaust areas for the actual attic, not from a rule of thumb, and we clear blocked soffit vents before the new roof goes on. A ridge vent only works when the ridge is actually cut open, so we verify the slot, not just the cap. Most shingle manufacturers condition their warranties on adequate ventilation, so this is not optional detailing. It is part of the system.
Wind and impact ratings, read plainly
Shingle wind ratings are earned in a laboratory and only apply in the field when the nailing matches the tested pattern: correct count, correct zone, correct depth, driven flush. A high-wind shingle nailed above the nailing line or overdriven performs like a cheaper one. We hold crews to the printed nailing spec because the rating is meaningless without it.
Hail is the other Ohio reality. Class 4 is the highest impact rating under the UL 2218 test, in which shingles must resist cracking under steel ball impacts. It is a measure of tested toughness, not a promise that a roof is hailproof; severe hail can damage any roofing material. Some insurance carriers take impact ratings into account when pricing homeowner policies, but terms vary and that conversation belongs between you and your carrier. What a rating reliably tells you is how the material behaved under a controlled test, which is more than most marketing language can say.
The paperwork is part of the roof
Manufacturer material warranties generally require that the product was installed per the manufacturer’s published instructions, with compatible components from the same system. An undocumented installation puts that coverage in question before the first storm arrives. So we treat documentation as a build step, not an afterthought: photographs of deck condition after tear-off, a written scope that names each component and its specification, and installation per the manufacturer’s documentation rather than habit.
Materials we specify include GAF shingle systems among others, matched to the roof’s exposure, pitch, and budget. The brand matters less than the completeness of the system and the discipline of the installation. Freeze-thaw cycling, humid summers, and spring wind and hail events will audit the work either way. We would rather that audit find flashing that was stepped and counterflashed correctly, a deck that was verified before it was covered, and a ventilation path that actually moves air.