Roof ventilation is one of the most consequential, and most overlooked, components of a residential roofing system in Baton Rouge. An unventilated attic in Louisiana’s climate can exceed 150°F during summer, which accelerates shingle wear, drives up cooling costs, and traps the moisture that causes mold, mildew, and decking rot. High attic temperatures also cause asphalt shingles to deteriorate faster than they should, shortening the useful life of an otherwise sound roof.
If you’re planning a roof replacement, understanding how ventilation works, and what your home actually needs, is just as important as choosing materials. The four questions below cover what every Baton Rouge homeowner should ask before signing a contract.
How much roof ventilation does a home need?
The industry standard is one square foot of net free ventilation area for every 300 square feet of attic floor space, split evenly between intake and exhaust. Homes without a vapor barrier require double that, one square foot of ventilation for every 150 square feet of attic floor space.
That 50/50 split between intake (typically soffit vents) and exhaust (ridge, gable, or box vents) is what creates the convective airflow that pulls hot, humid air out of the attic. Without that balance, ventilation underperforms regardless of how many vents are installed.
What types of roof vents are available?
The main types of residential roof vents are ridge vents, soffit vents, gable vents, off-ridge (box) vents, powered attic fans, and wind turbines. Each functions as either intake (bringing fresh air in) or exhaust (letting hot, moist air out), and a balanced system uses both.
Ridge and soffit vents are the most common pairing on modern Louisiana homes because they create continuous airflow with no moving parts to fail. The right choice for your home depends on roof design, attic layout, and existing ventilation, there’s no single “best” vent, only the best fit for the specific roof.
How do I know which roof ventilation system is right for my home?
The right ventilation system is determined by three things: your roof’s slope and structure, the size and layout of your attic, and the condition of any existing intake vents. A qualified roofing professional should evaluate all three before recommending a system.
The goal is balanced airflow, enough intake at the soffits to feed enough exhaust at or near the ridge, that manages heat and moisture and supports the long-term performance of your roof. Pelican Roofing’s project managers run this assessment as part of every replacement quote so the ventilation plan is matched to your home, not estimated from the curb.
Can I mix roof ventilation types?
You can mix roof ventilation types, but combining multiple exhaust vents, for example, a ridge vent and a powered attic fan, or a ridge vent and gable vents, is generally not recommended. When two exhaust openings share the same attic, one tends to short-circuit the other: instead of pulling fresh air up through the soffit intakes, the higher exhaust draws air directly from the other exhaust opening.
The result is twofold. The convective airflow ventilation breaks down, leaving parts of the attic poorly ventilated. And in heavy weather, the underused exhaust can become an entry point for wind-driven rain or moisture. The accepted best practice is to pair continuous soffit intake with a single exhaust type, sized correctly for the attic.
Get the Right Ventilation System for Your Home
Pelican Roofing handles ventilation as part of every full roof replacement in Baton Rouge and across Louisiana. Every project gets a dedicated project manager who evaluates your attic, sizes intake and exhaust correctly, and matches the vent system to your roof’s design so the work gets done right the first time.
Schedule your free consultation to get a clear picture of what your home’s roofing system needs.