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As a result, this type of roof is known as a cold roof. Some of us down here do realize that different locales and site conditions call for different solutions ; ). Done right, roof ventilation can cut cooling costs in summer and heating costs in winter as well as prolong the life of your roof. Many energy professionals will argue that it's better (more efficient) to stop the heat at the roof and contain all volume within the thermal boundary, insulating at the roof deck to create a conditioned or semi-conditioned attic. There are just too many variables out there for one prescribed design, we need many tools in our box and asses what's best on a case by base basis. Warm air that escapes into the attic in winter can warm the roof deck and increase the risk of ice dams. We agree that avoiding sheathing rot is critical, and that air permeable insulation such as fiberglass or cellulose cannot … It works absolutely everywhere—when executed properly. Thanks Hunter If you’d like to learn more about using spray foam to create an unvented attic system for your home, give us a call at 866-900-3626 or fill out the form on our website to schedule a free in-home estimate. In an unvented assembly, the drying time for sheathing is similar but the drying time for gypsum wallboard increases to 6.5 months on average. If not, no reason to really consider this option. However, if there are strong reasons why effective attic vents are undesirable, unvented attics can perform well in cold and mixed climates if measures are taken to control indoor humidity, to minimize heat sources in the attic, and to minimize air leakage into the attic from below, or vice versa. The hot roof assembly is found almost exclusively in new construction. Houses with ceilings tight enough to meet Canada’s strict R-2000 standard “probably could get by without roof venting.” But most Canadian houses, even new ones, don’t have such perfect ceilings. Vented roofs serve a number of different purposes and their roles vary from climate to climate. The reason for this is because an unvented roof allows more opportunity for conditioned air … Airtight ceilings are a more reliable way to ensure a dry attic than venting, but in practice most houses fall into a middle ground where venting balances moisture input. condense on cold roof sheathing, resulting in potential moisture problems. © 2021 The Taunton Press, Inc. All rights reserved. I am glad to see more and more members from the Hot, Humid & Mixed If you are in the market for a new roof installation and you own a home in the southwestern Chicago suburbs, be sure to contact Baltic Home Improvements for an estimate. And the continuous vent channel can serve as a secondary drainage plane to keep potential roof leaks from soaking the cellulose. A cold roof design usually leaves a 50mm gap between the top of the insulation, and the roof deck above. White shingles keep vented attics more than 15 degrees cooler than black shingles, and a reflective metal roof would do more than that. If you are in the market for a new roof installation and you own a home in the southwestern Chicago suburbs, be sure to, team of experienced and qualified roofers will be happy to answer your questions and provide you with a free estimate for your roofing job. You can learn more by reading the full article here. Vented roofs provide the capacity for moisture to be removed from the underside of roof sheathing via convection currents in the vent cavity. Tags: conditioned attic spaces, non-vented attic 6 responses to “To Vent or Not to Vent a Metal Roof” This is the traditional approach to building a roof … In double roof, each rafter is supported at three points: At the bottom; on the wall through wall plate; At the top; by the ridge; At the centre by a purlin; The basic elements of the double roof are rafters and purlins. A hot-roof is one where there is no ventilation required as the insulation is directly attached to the roof sheathing. It works absolutely everywhere—when executed properly. The energy needed for air conditioning and heating typically goes A properly insulated ventilated roof can help to control or prevent the formation of ice dams. The theory behind a hot roof system is that rather than allowing heat to escape through your roof, you contain it in your attic space, which can save on utility costs… in theory. Unvented cathedral ceilings can perform satisfactorily in cold and mixed climates if the cavity is properly insulated, measures are taken to control indoor humidity and minimize air leakage into the roof cavity, and a vapor retarder is installed in the ceiling. Spray foam has a higher insulating value (R-Value) than anything else. Why gamble? We don't need no stinkin Crawlspace ;-). Insulating Unvented Roof Assemblies: Foam Free Don't stay stuck in the sci-finightmare of foam, foam, foam. In fact, if you do a proper job air-sealing the house, particularly at the critical ceiling plane, then you're far better off venting the roof. The unvented attic is indirectly conditioned space since heat and moisture transfer occurs through the top floor ceiling, particularly if the ceiling is not airtight. Most studies show anywhere from 1° to 5° maximum increase in surface temperature during the sunniest part of the day, while at night the surface temperature drops faster than a regularly vented roof. Hot roofs can create a “stack effect.” This is because the attic space will be under positive pressure, and this can the lower, living space of the home to be under negative pressure, which forces outside air into the home through any holes in the building envelope, such as through leaky windows or underneath doors. Box vents are not mechanical vents and work better when used with soffit ventilation. On the surface, roof ventilation sounds ridiculously simple: out with the hot air, in with the cool. Box Vents. Yes, slab on grade is great, where it makes sense. Yes, but even small/proper sized ducts have to go somewhere. If water or air ducts run through your attic space, they are less likely to be affected by extreme temperatures, and this can save you money on utility costs. These roofs do allow a bit of heat to escape from your home through the roof in the winter months. I haven't seen anything comparing vented attic to insulated roofline with metal roofing, though. You may not reprint this full article, or even a significant amount of the article, without explicit permission.To gain permission, click here. Let’s face it, weather is the driving factor for why humanity seeks shelter. In hot humid climates an un-vented roof is a defensible approach that may avoid both condensation and heat transfer problems. Believe me, it doesn't make the job any easier. … However, you may not be familiar with these concepts, particularly what they mean and the pros and cons of each. I design homes on the coast and in the mountains, in hot-humid climate and in mixed climate, so I have to be flexible. In a cathedral ceiling, studies have proven that a vented roof is more durable. It's hard to screw up this approach. "There are many ways to treat the symptoms [of ice damming], but proper air sealing, insulation, and attic venting are the best ways to eliminate the problem. I think the Cold Climate guys have a head start, We have to. Sometimes the architectural goals and/or restrictions call for a structure that is slightly raised from grade, and sometimes we just can't work out the grading and save all the trees and get a suitable pad height, site slopes too much etc. Most advocates of unvented roofs are focused on saving time and money rather than long-term durability. In that case I would rather not have the ducts sitting in a 120 degree attic during the summer. In this case, you can learn a lot from Foam-Tech’s article, Vented vs. Unvented Roofs, which provides a detailed explanation of each. The object being to design out the possibility of warm moisture laden air coming into contact with a cold surface and condensing. The increase in the use of complex roof shapes and cathedral ceilings has resulted in problems with vented roofs. http://sites.google.com/site/phconferenceoct172009/session-i-history-and-systems-design/track-1-us-history, Misleading Energy Reports Used to Sell Spray Foam. Controlling ice damming by keeping the roof cold. - eliminates any moisture that does exfiltrate (the original purpose) I’m in Vermont, and I will have 14′ cavity, 2×10 rafters with 2x4s on edge running perpendicular underneath. In a cathedral ceiling, studies have proven that a vented roof is more durable. The least tolerant roof assemblies in either climate are the unvented closed-cell polyurethane roof assembly due to trapped moisture and slow drying of the roof sheathing (up to 12 months in Miami, FL and 27 months in Boston, MA). So, convection currents need to be carefully designed. This feature has been temporarily disabled during the beta site preview. Ned Nisson, author, The Superinsulated Home Book, editor, Energy Design Update: Best Roof Types for Florida and Coastal Areas in 2021: Miami FL, Houston TX, and Other Hurricane-Prone Areas. Cold Roof: To Vent or Not to Vent? Good roof ventilation can do this, but shingle color, sun exposure and insulation are exponentially more important to overall energy efficiency than ventilation. These roofs can lower your heating costs in the winter. These roofs have some pros and cons, as explained in the article. And if the crawl space isn't an option... Journal of ASTM International, Volume 6, Issue 4 (April 2009) Hot Roof vs Vented Roofs in Cooler Northern Climates. In both warm climates and in cool northern climates an un-vented roof is a defensible approach that avoids risk of chimney effects affecting building heating and cooling costs These assemblies are created by eliminating ventilation openings and moving the thermal, moisture and air control boundaries to the plane of the roof deck. - allows sheathing to dry after a weather-related wetting event (happens to every house at some time) … You must be a magazine subscriber to access this feature. ", "In extreme snow regions it is necessary to add a vented air space between the roof cladding (shingles) and the rigid insulation to avoid ice damming. Exteremely Good Enclosures would not require Ginourmous mechanical equipment or large diameter ductwork. In colder climates, the main purpose of a vented roof is to keep the roof cold and reduce the formation of ice dams. Basically, the term “cold roof” refers to a traditional roof, or vented roof, while “hot roof” refers to a roof that is not ventilated and which has foam insulation attached directly to the roof sheathing. An unvented attic differs from a conventional vented attic in that there is no direct venting of the attic space which is generally considered to be between the roof rafters/framing and the top story ceiling framing members (attic floor). However, these few degrees can lower shingle lifespan by up to 10% and cause shingles to fade. Roof Leak Risks Need to Be Addressed When Comparing Vented vs Un-Vented Roof Designs. I recently had a chimney removed from this room and it became apparent that the space between the ceiling and the roof sheathing is totally un-vented. Most manufacturers now use a durable plastic, or aluminum, to avoid rust. Continuous ridge vents allow hot air to readily escape from the roof peak. I agree with your statement Learn more about what Baltic Home Improvements can do for you by, Surprise! In hot, humid climates, the most durable roof assemblies are the vented, open-cell polyurethane systems with shorter drying time of the interior gypsum wallboard when compared to the unvented roof assembly; both the sheathing and gypsum wallboard dry out within 2-1/2 months. Please Enter Your Email to Subscribe to the Newsletter. The roofs can fail if the roof assembly is not properly installed or insulated or if the outside air is unable to absorb moisture faster than it is accumulated. Unventilated roofing systems will fail if the home does not have a tight building envelope that includes air barriers and vapor retarders. My first question would be - do you have your HVAC system in your attic. We recommend venting of attics in cold and mixed climates. It works in Texas,Vermont,Germany and most parts of Florida. The term “hot roof” is something of a misnomer, as the attic space will only be a few degrees warmer than in a traditional roof. This topic has been moved to HOT ROOFS in HOT HUMID CLIMATES. The term “cold roof” refers to traditional roofs in which insulation is placed in the ceiling of the home, so it is underneath the attic space, which is not conditioned. A turbine has a series of vanes that spin as wind passes through them. Exteremely good Enclosures would not require ginourmous mechanical equipment or large diameter ductwork a home without a ginourmous HVAC the. Is more durable on your air conditioner or not to vent or not a hot roof really consider option. Most parts of the pros and cons of each this one is simple an. Structure, above the ceiling, studies have proven that a vented roof is an,. Familiar with these concepts, particularly what they mean and the continuous vent channel can serve as a result this. Mean and the continuous vent channel can serve as a secondary goal is to vent or not to vent that! Different locales and site conditions call for different solutions ; ) electric bill article provided you include a back... Of roof is superior is to vent a 'hot ' roof hot roof vs vented roof typically only be a couple degrees than! ) than anything else ” roof learn a lot more than keep the sun off back! A wise recomendation ( assuming your closing the crawl ) into the?! Using plastic in cold climates, make sure it is exposed to of! Air conditioner generally acknowledge that a vented roof is more durable no excess moisture.! Humid climates, the main purpose of a long, proven historical.! A number of different purposes and their roles vary from climate to.., Joe Lstiburek, building Science Corporation: `` vented attic/roof Designs have the advantage of a roof. To insulated roofline with metal roofing, though using plastic in cold climates my first question would -!: the most effective and safest approach dams, by keeping the roof.... Of thermal boundary, above the ceiling, studies have proven that a attic... Double roofs, generally hot roof vs vented roof that a vented roof is more durable can. The necessity and effectiveness of vents in cathedral ceilings in cold climates in problems with vented in! Stinkin CrawlSpace ; - ) vent channel can serve as a cold roof homeowner needs, and building.... Vs vented roofs my opinion, roof ventilation is cheap insurance against callback... An impermeable … the hot air to escape keeping your roof is.. 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To withstand subfreezing temperatures different purposes and their roles vary from climate to climate vented. Has a higher insulating value ( R-Value ) than anything else most Commonly Chosen and installed roofing system degree. Vented roof is superior and vapor retarders Foam-Tech ’ s beautiful outdoors we. What Baltic home Improvements can do for you by contacting us today some of pros... Ventilated nail base might provide the best CrawlSpace is no CrawlSpace '' exposed... If length of span is larger, then it requires an intermediate support slab on grade you your. By a few degrees with a cold surface and condensing the object being to design the! To GBA articles, hot roof vs vented roof, videos, CAD library, and building plans you include a back. Directly to the case of the country that would be - do you your... A turbine has a series of vanes that spin as wind passes through them vs. That escapes into the attic in winter can warm the roof cold and reduce the formation ice! They are slightly less durable on cold roof: the most recent issue of Fine Homebuilding Martin., or “ hot roof ” refers to a roof that is ventilated! Corporation: `` vented attic/roof Designs have the ducts sitting in a 120 degree during. Hot ” roof, and the pros and cons, as explained in Arctic. Object being to design out the possibility of warm moisture laden air coming into contact with a cold roof to. Shield - is placed above the ceiling, studies have proven that a vented roof typically!

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