When the time comes to replace your roof, you’ll have a lot of decisions to make. One of those decisions will be what type of ventilation you want with your new roofing system. Since most homeowners are not roofing experts, we commonly get asked, “What is the best ventilation system for a roof?” We want homeowners to feel knowledgeable and confident when making decisions about their roof replacement, which is why we created our Learning Center. This article will explain the difference between box and ridge vents, why ventilation is essential to your roof, and our recommendation.
Roof Ventilation Methods
Before explaining the difference between box vents and ridge vents, let’s first break down the types of ventilation methods. To properly ventilate your roof and attic space, cold air must be brought into your attic, and hot air must be expelled through vents. Because hot air rises, vents are typically placed near the peak of your roof for the most efficient process.
There are two types of ventilation systems – passive and active.
– Passive ventilation relies on natural forces – such as convection or wind, to operate. As cool air moves in, hotter air is pushed to the top and ultimately out of the vent.
– Active ventilation works by force. Active ventilation pulls in cooler outside air and pushes hot air out of your attic. Most forms of active ventilation will require a power source – whether solar or electric.
What is a Box Vent?
Box vents are a type of passive ventilation system. They are square-shaped vents that sit over a hole in your roof and are secured by nails and caulk to prevent leaks. Box vents have no mechanical parts and require no maintenance (aside from annual roof inspections to ensure they function properly). The exact number of box vents you’ll need will depend on your roof’s square footage.
The downside of traditional box vents is that they are more prone to leaking than ridge vents and offer small critters a way into your attic.
What is a Ridge Vent?
Ridge vents are a form of active ventilation. They are cut directly into a roof’s ridge line, which makes them extremely low profile. Ridge vents blend in with the rest of your roof and are much less noticeable than box vents from the ground. Their unobstructive nature makes them very popular among homeowners. Additionally, ridge vents are now manufactured out of durable plastic or aluminum, meaning they won’t rust over time.
Ridge vents are more expensive than box vents, but the cost may end up being very comparable. This is because ridge vents are so efficient that more box vents will have to be installed to achieve the same ventilation effect. A rule of thumb is that 40’ of ridge ventilation equals 18 box vents.
Box vs. Ridge Vents – Our Recommendation
Now that you know more about box vents and ridge vents, you’re probably wondering – “Which is best?” While both roof ventilation systems will get the job done, we recommend ridge vents to our homeowners. Remember, one ventilation system isn’t necessarily better than another, and each home is unique. However, ridge vents have superior functionality and a less intrusive appearance than box vents. Many homeowners also find their prices comparable, as many box vents are required to do the same amount of ventilation as one ridge vent.
If you have a complex roof with varying ridge heights and interconnected attic spaces, ridge vents would most likely be the most efficient option for your roof. Alternatively, ridge vents would not be an option if you have a flat or low-sloped roof.
Ventilation is critical to your roof
uring hot Louisville summers, attic temperatures can soar to 170 degrees or higher. Your roof’s ventilation system lets hot air escape and prevents damage from extreme heat, such as dry rot. Dry rot can severely compromise your roof’s most critical components, including the decking.
Now that you understand why ventilation matters, here’s a more complete list of roof ventilation options beyond standard box and ridge vents:
Active Ventilation:
- Ridge vents
- Solar-powered vents
- Power vents
Passive Ventilation:
- Turbine vents
- Box vents (also called turtle vents)
Choosing the right ventilation system depends on your budget, home features, and preferred appearance. While proper ventilation is essential, hiring the right Louisville roofing company is the most important decision you’ll make during a roof replacement.
What is my Roofing System Made of?
Your roof includes much more than shingles and ventilation. Each component works together to form a complete roofing system. During a roof replacement, your contractor should replace these elements to ensure your new roof performs properly and lasts for years.
Decking: The roof decking forms the base layer. Contractors fasten shingles to OSB sheathing or plywood.
Underlayment: This layer sits between the shingles and deck, providing the last line of defense against leaks.
Ice & Water Shield: Placed on top of underlayment, it seals nail holes and protects leak-prone areas.
Drip Edge: Metal flashing along the roof perimeter directs water away from fascia boards.
Ventilation: Proper ventilation prevents overheating, protects your roof and decking, and extends roof life.
Pipe Boots: These seals wrap around plumbing vents to keep water out.
Shingles: Shingles form the visible part of your roof and often draw the most attention from homeowners.
Flashing: Flashing channels water away from vulnerable spots and into gutters. Replacing flashing during a roof replacement is more efficient and cost-effective than doing it later.
When all these elements work together, your roof functions as it should. A routine roof inspection ensures every component performs correctly. We recommend inspecting your roof annually to prevent leaks and maximize its lifespan.
Louisville Roof Repair and Replacement
Make sure your roof replacement is done right. Finding a trustworthy Louisville roofing contractor can be difficult. We walk you through best hiring practices and red flags to look out for with roofing contractors on our Learning Center and Youtube.
AIC Roofing and Construction has served the Louisville, Lexington, and Richmond communities since 2003. We are proud to be in the top 2% of roofing contractors to hold the GAF MasterElite certification and are an Owen’s Corning Platinum Preferred contractor. If you’re looking for a top-rated Louisville roofing company – we’d love to see if we would be a good fit for your project. Contact us today to schedule your free, no-hassle roof inspection.
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