Chattanooga sits in a humid subtropical climate: long hot summers, high moisture, a spring severe-weather season that brings hail and straight-line wind, and enough freeze-thaw cycling in winter to find any weakness in a roof's details. That combination rules some materials out and makes the trade-offs between the rest fairly clear.
Architectural asphalt shingles
This is the default for most homes here, and for good reasons rather than lazy ones. They are dimensionally thicker than three-tab, carry meaningfully better wind ratings, handle thermal cycling well, and are straightforward to repair — which matters more than people expect, because a repairable roof is one where storm damage does not automatically mean replacement.
Best for: nearly every residential roof in the Tennessee Valley. Watch for: ventilation. An under-ventilated attic cooks asphalt from underneath and is the most common reason shingles here fail early.
Three-tab shingles
The older, flatter, single-layer product. Cheaper up front, lower wind rating, shorter service life, and visibly plainer. There are situations where it is the right economic answer — a rental, a short hold, an outbuilding — but on a house you intend to keep, the gap in cost between three-tab and architectural is usually small relative to the gap in performance.
Standing seam metal
Genuinely excellent in this climate. It sheds water and debris, handles wind well, reflects heat rather than absorbing it, and lasts far longer than asphalt. It is also the most expensive option by a wide margin, it needs installers who do it regularly, and repairs are less trivial than swapping a few shingles.
Best for: homes being kept long-term, low-slope sections where shingles are marginal, and buildings where the look is wanted. Watch for: hail. Metal handles hail structurally, but softer panels can dent cosmetically — worth discussing given how our spring seasons run.
Corrugated and exposed-fastener metal
Cheaper than standing seam and common on outbuildings, barns, and shops. The fasteners penetrate the panel, and their washers are a maintenance item over time. Fine for the right building; not the same product as standing seam despite both being "metal roofs" in conversation.
What we do not generally recommend here
- Wood shake — beautiful, and a poor match for sustained humidity and this fire environment. Maintenance is relentless.
- Clay and concrete tile — heavy enough to require structural verification, and unusual enough locally that finding qualified repair later is genuinely difficult.
The thing that outranks material choice
Installation quality and ventilation matter more than which product you pick. A premium shingle installed over an unventilated attic with reused flashing will fail before a mid-range shingle installed correctly. When we quote a roof, the ventilation calculation and the flashing plan are part of the conversation — not because it sells more, but because it is where roofs in this climate actually go wrong.
Ask any roofer what intake and exhaust ventilation your attic has now, and what it should have. If they have not looked, they have not designed a roof - they have priced a pile of shingles.
