Stick a thermometer in a typical Houston attic in July and you'll see something between 130 and 150 degrees. That heat isn't just uncomfortable — it's actively shortening the life of the roof above it and costing you money every month on the electric bill.
Here's the mechanism. Shingles are designed to shed heat upward and outward. When the attic below them is superheated and the air is stagnant, the shingles cook from both sides. The asphalt dries out, loses its flexibility, and starts to curl, crack, and shed granules years earlier than it should. We've pulled 12-year-old roofs off badly ventilated houses that looked like 25-year-old roofs.
Proper ventilation is a balanced system, and that word matters. You need intake — usually soffit vents along the eaves — and you need exhaust up high, typically ridge vent, turbines, or static vents. Air enters low, picks up heat, and leaves high. If you only have exhaust and no intake, the system pulls conditioned air out of your living space instead. If you only have intake, nothing moves at all.
The most common problem we find isn't missing vents — it's blocked intake. Insulation gets blown into the eaves during an attic upgrade and seals the soffit vents completely. From outside the house it looks perfectly ventilated. From inside the attic, nothing is moving. Baffles fix this and they're inexpensive.
The second most common problem is mixed exhaust types. Ridge vent and turbines on the same roof plane fight each other — the turbine pulls air from the ridge vent instead of from the soffits, and your intake never engages. Pick one exhaust strategy per roof plane and commit to it.
There's a warranty angle here too. Most shingle manufacturers require code-minimum ventilation to honor their warranty. If your roof fails prematurely and the manufacturer's inspector finds inadequate ventilation, that claim can be denied. It's worth knowing where you stand before you need to find out.
Attic ventilation is one of the cheapest meaningful upgrades you can make to a roof, and we assess it free as part of every inspection. Call (210) 668-6263 and we'll measure your intake against your exhaust and tell you exactly where you stand.