What is the Best Ventilation for a Roof?
There are many different types of roof ventilation, which makes it difficult to narrow down the selection to a single best roof ventilation unit. Ultimately, the best roof vent for your home is the one that properly calculates your home’s airflow and the roof’s design to remove the most cubic square footage of attic air space the most effectively. There are many different types of vents. These vents include box vents, wind turbines, power vents, ridge vents, off ridge vents, cupola vents, soffit vents and more.
How is Roof Ventilation Calibrated?
Let’s set up a scenario. A builder needs a venting system for his roof. The builder will select a reputable, licensed roofing contractor to assess the roofing structure and thereby suggest a ventilation system. In an ideal scenario, the roofing system is built with the venting system in mind. Over time, blockages and other factors can dislodge or inhibit the ventilation system. When this happens, there needs to be a re-check and re-calibration of the roof vents.
How Much Ventilation Does a Roof Need?
Generally speaking, most codes use the 1/300 rule for minimum residential attic ventilation recommendations. This translates into some common-sense requirements. For every 300 square feet of enclosed attic area, one square foot of ventilation is necessary. Depending on how large the enclosed attic space is, there will be more or fewer vents. For example, with a home that has 2,000 square feet of attic floor space, calculations must be made. Ultimately, there will need to be 6.66 square feet of attic insulation. Because the system needs to be balanced, this figure will need to be divided into two so that half of the ventilation is dedicated to intake, and the other half, to exhaust.
Do Roofs Need to be Vented?
Essentially, building condensation problems evolve over time when moisture is trapped in a space that is not properly vented. This moisture tends to build up over time and cause serious structural issues, not to mention mold and mildew. Ventilation allows the flow of air through a system of intake and exhaust. Understanding why roofs need to be vented is actually a fairly new innovation, dating to the early-to-mid 20th century. During that time, the American Society of Heating, Refrigerating & Air-Conditioning Engineers recognized that accumulated moisture stemming from poor roof ventilation was causing serious building problems.
How Do You Know if Your Roof is Properly Vented?
Determining if your roof is properly vented can be diagnosed. The process is fairly straightforward. First, ascertain whether or not your attic floor is sealed. Next, the top plate insulation needs to be investigated. In a properly vented home, enough bulk insulation is installed above the top plate so that its R-value (the capacity of an insulating material to resist heat flow) is at least as high as that of the wall assembly.
How Roof Ventilation Works
Roof ventilation is an important and necessary part of your roof system. Roof ventilation occurs through the continual flow of air through the attic space, maneuvering the overheated air and moisture out of the roof system. Roof ventilation reduces the impact of changing temperatures and moisture conditions both inside and outside the home.
What is the Best Roof Ventilation System?
The best roof ventilation system will be balanced. This means that an equal amount of intake and exhaust throughout the periphery of the roof. Warm, moist air needs to be able to exit the roof system, while cool, dry air needs to be allowed to enter. This system is best managed through a 50% intake and 50% exhaust attic ventilation system. If for some reason this balance cannot be negotiated, it is better for there to be more intake than exhaust.
Roof Ventilation With No Soffit
If your attic is poorly ventilated, you will experience increased moisture and heat throughout the home. Venting your attic will continue to be important both for the integrity of your roof and for decreasing energy bills and overall home satisfaction. If your home happens to have no eaves or soffits, the most common way to add ventilation is to install air intakes in the soffits and put an outlet at the gable of the house.
How to Improve Roof Ventilation
Do you need to improve your roof ventilation? If so, there are a number of ways that you can accomplish this goal.
- Install roof vents.
- Install soffit vents.
For a roof or soffit vent installation, please call a local, trusted roofing contractor. He or she will be able to give you an estimate and further accurate details concerning your roof that will improve your overall attic ventilation.
If you think you need roof ventilation in Oklahoma City, OK, call Covenant Roofing at 405-720-6200 to speak with our staff about making an appointment today!