Although most commercial buildings use flat roofs, there are several different commercial flat roof types. When shopping for a home or considering an upgrade, the pitch of a home's roof won't gain as much attention as, About Blog Roofing Testimonials Contact. Home Advice. Box Vents Box vents are considered static vents since they have no moving parts. Soffit Vents Soffit vents are installed in the eaves of your roof. Roof Ridge Vents These vents, as the name implies, run the entire ridge of your roof.
Turbine Vents Unlike box and ridge vents, these vents are not static. Connect With us. Types of Commercial Flat Roofs: Your Options Although most commercial buildings use flat roofs, there are several different commercial flat roof types. How to Calculate Roof Pitch When shopping for a home or considering an upgrade, the pitch of a home's roof won't gain as much attention as, Contact Us We're Here to Help! Though they sound similar in name, an off-ridge vent is only similar to a ridge vent because they both sit close to the crest of your roof.
Overall, off ridge vents are not a very popular style of vent and not one we recommend when compared to other, more effective exhaust roofing vents. Off ridge vents are not as effective as full ridge vents because they are much smaller and do not sit as high on the roof.
Their size prohibits them from expelling a large amount of hot air and their location restricts their ability to vent the absolute hottest air, like a ridge vent. The most popular off ridge vents on the market are approximately 4 feet in length. Often made of galvanized steel,installation involves cutting a hole the size of the vent itself into the roof approximately one foot below the ridge line. Off ridge vents are advantageous when the actual ridge line of the roof is small.
This can happen with complex roofs and homes that do not have one long, continues ridge line for a traditional ridge vent to run across. If your home has lots of peaks, valleys, and dormers, then this may be a type of vent to include in your ventilation system. This will not always be the case however, so make sure you speak with a trustworthy roofer before making the call.
As a roofing contractor, Roof Hub is not the place to buy any attic roof vent products. Home Depot and Lowes both have a selection of common roof vent types, but we suggest browsing roofvents. They have roof peak vents, roof intake vents, and many more options that come in a variety of sizes.
If you need it, it looks like they have it! Though we have not used this retailer ourselves, they seem to have great reviews and in-depth product information.
One of the main similarities to an off-ridge vent is that the first step for installation is cutting a hole in the roof for the vent to sit over. Another similarity is that box vents are generally installed in bunches across the roof in order to add extra ventilation.
Just one or two box vents is not nearly enough to vent your entire roof! The most common sized box vent on the market today is 18 inches by 18 inches. Their small size is mostly a drawback, but does offer some versatility when compared to a ridge vent. Like with off-ridge vents, using a box vent makes sense for more complicated roof lines that have lots of different sections. But if you have a larger roof line, then a ridge vent is most often much more effective.
However, off-ridge vents are very commonly used on hipped roofs and if you have a hip roof, then these are a great option. Powered attic vents, also known as powered attic ventilators or attic power vents, are electric-propelled fans that help pull stale air out of an attic space. They work much like a box fan placed in a window on a hot summer day. They can effectively pull the hot air out, but come with a tradeoff of higher electricity costs.
Overall, one of the main reasons for attic ventilation is keeping your attic at a constant temperature when compared to the rest of your home. In the summer the space may be a little warmer and a little cooler in the winter, but what we are trying to avoid is extreme temperature fluctuations from season to season. This is important to note when discussing powered attic vents because their power can often be either detrimental to a ventilation strategy, or not powerful enough to make a difference at all….
However, the impact over the cooling season is fairly modest with well insulated attics. This suggests that the powered vents could actually be pulling cooler air up through the main floors of the home and out of the attic, thereby increasing energy costs and forcing the air conditioning unit work harder. Finally, Parker and Sherwin note that the existing homes in the study did not originally have a exhaust ventilation, like a ridge vent. This is a major point because the addition of any exhaust to a system lacking one would be beneficial, whether that vent is powered or non-powered.
According to other homeowner reports, weaker power vents have a tendency to circulate air rather than expel air. On top of the apparently complex downsides mentioned above, you have the electricity costs.
Though the added costs may be small over days or weeks, the increases start to add up over the course of months and years. Higher operational costs is a substantial reason why traditional hard-wired systems have transitioned to solar power over the last few years. Simply removing electricity costs does not change the way the unit operates. The fans are often either too powerful, or not powerful enough. More is not always better!
For these reasons, it is best to use more natural, time-tested methods of exhaust for your roof. If you already have proper venting in your attic, then you are better off without the addition of a powered fan, even if it is run on solar panels. Whirlybird is a fun word to say, and we consider this a significant benefit to owning a roof turbine. Even on days with lots of wind, the strength of whirlybirds as a ventilation tool is questionable. They are often smaller than a box vent or off-ridge vent, which limits the amount of hot air they can pull out of the attic space.
Whirlybird roof turbines may not be the most effective way to ventilate your roof, but there are some benefits to using them. First, they eco-friendly and green because they do not require electricity. With the exception of occasionally lubing of the unit, there is little to no maintenance or upkeep required with ownership.
And unlike the power vents mentioned earlier, they are quite silent even on a windy days where gusts exceed 20 miles per hour. Cupola vents are one of the least common types of roof vents because of their cost, complexity and because not everyone has the primary problem they were designed to solve.
The origins of cupola vents stem from use in barns. In their original form, cupola vents acted as both an exhaust and intake. In modern day roofing and design however, one of the main reasons to use a cupola vent is to allow extra light into an area underneath the vent. Cupola vents come in many different shapes and styles. Ideally, you should also add one internal ceiling grille, to allow any hot or moisture-laden air inside your home to pass into the roof cavity where it can be exhausted to the outside.
Solar Star recommends one V model is adequate for roof with less than m 2 of space whereas the RM is capable of extracting M 3 of air per hour. The recommended number of ventilators for the Solar XVent on a regular shaped roof is one vent is sufficient for around 90m2 based on a ceiling to ridge height of 1.
Builders and designers became aware of the need for adequate roof ventilation in the mid 20 th century. Increasingly effective sealing and insulation in roof cavities and internal walls trapped hot humid air in the summer and cold damp condensation in the winter.
That moisture build-up can damage timber framing, gyprock ceiling panels, electrical wiring and trigger a dangerous growth of harmful mould. Without adequate ventilation the hot summer air in the roof space forces your air conditioning to work harder to achieve the desired levels of heat extraction and will increase your electricity bills and running costs as well as shorten the lifespan of the AC units. Modern insulation and building practices create such as well sealed structure that adequate roof ventilation is needed more than ever.
Roof ventilator installation is typically very straightforward and cost effective. Some models take as little as 30 minutes to install for a qualified installer. Ventilation Quick Links. What are the benefits of roof ventilation? How does roof ventilation work? What's the best type of roof ventilation for my roof? Roofs without ventilation How much does it cost? What about installation? Roof ventilators can eliminate these negative impacts. This is especially true when your AC units are ducted into the roof cavity.
Roof ventilation works by regulating the temperature and humidity levels in your roof cavity. In simple terms, roof ventilation works because hot air rises. We supply all types including: Wind-driven Whirlybirds Solar powered Roof Vents Electrical roof mounted fans Passive ridge ventilation One of the most critical questions to ask is does your chosen option provide enough ventilation for your given roof space?
You can read more about how to work out this requirement for your home lower down the page. Vent-a-Roof is one of the first concealed ridge ventilation systems in Australia. Vent-a-Roof is simple to install and delivers real cost-savings on installation and labour.
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