Your attic is not a storage space—it's a thermal battleground. In Houston, summer attic temperatures can reach 150°F, cooking your HVAC ducts and shortening shingle life. The solution? Proper soffit ventilation calculations that balance intake and exhaust. At Houston Roofing & Gutters, we turn attic math into measurable energy savings.

Soffit vents are your roof's intake system. Without enough intake, exhaust vents (ridge, box, or power vents) pull air from attic floor cracks—not from outside. This depressurizes your home, pulling conditioned air into the attic.

The calculation (simplified):

• Net Free Area (NFA) formula: 1 sq ft of ventilation per 150 sq ft of attic floor space (1:150 ratio per IRC).
• Intake vs. exhaust split: 50% intake (soffit) / 50% exhaust (ridge or cans).
• Example: 2,000 sq ft attic → 13.3 sq ft total NFA → 6.65 sq ft soffit intake.

Houston-specific adjustments:

• High humidity → add 15% more intake to prevent moisture pull from living spaces.
• Dark shingles → increase exhaust by 10% to shed radiant heat.
• Vaulted ceilings → use continuous soffit strips instead of individual circular vents.

We also check for blocked soffits (insulation or rodent nests) using a bore scope. Even perfect calculations fail if airflow is physically obstructed.

Your soffits aren't decorative—they're your attic's lungs. Calculate them right, and your AC works less. Calculate them wrong, and you're burning money.

Soffit ventilation calculations are the foundation of attic temperature regulation. Houston Roofing & Gutters designs balanced systems that lower energy bills, extend shingle life, and prevent ice-dam formation (yes, even in Houston).