CertainTeed offers a reduced warranty of 10 years when their shingles are used on unvented roofs: http://www.certainteed.com/resources/GeneralAsphaltShinglesWarrantyEnglish.pdf. This phenomenon occurs regardless of whether the roof is vented or unvented in the absence of a vapor barrier between the asphalt shingles and the roof deck. An array of lights provided the solar heating. Asphalt shingles are a reservoir for water and behave similarly to traditional wood shingles and cedar shakes in that regard. BSC made discoveries on unvented roof behavior in hot humid climates during field implementation; several of these roofs were built in the Houston TX area circa 2001 (IECC climate zone/CZ 2A). Since these factors can affect how a shingle ages, it may be reasonable for manufacturers to limit or exclude warranty coverage on unventilated roofs. Some fiberglass reinforced underlayments have permeances as high as 28 (type of test not specified). In ASHRAE Fundamentals (2001), 15-lb asphalt felt has a wet-cup permeance of 5.6 and 15-lb tar felt is 18.2 perms. Roofing shingles and materials, plus factory-certified roofers (including ratings from real homeowners!) Thus asphalt shingles form a water reservoir not unlike wood shingle … The shingle maker has to agree that the ventilation is up to its standards. Asphalt shingles are an American invention by Henry Reynolds of Grand Rapids, Michigan. Turning off the heat lamps led to rapid cooling (the testing facility is air- conditioned) and condensation. In fact, as you might guess from that quote, just having the roof ventilated may not be good enough. 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. There are typically no supply or return registers fr… However, ventilation affects not only shingle temperature but also the level of moisture in the roof assembly, as well as the melting and refreezing of snow on the roof. Frankly, asphalt shingle warranties from ALL companies contain so many limitations and exclusions (for example, labor exclusions) that roofing … Since this product is hydrophobic, its permeance will not increase when exposed to high moisture loads. S. heet # 155. Asphalt shingles store water from dew (condensation due to night sky cooling) and rain. ft.) Roofing Starter Shingle Roll with 112 reviews and the GAF Marquis WeatherMax Charcoal 3-Tab Roofing Shingles … This inwardly driven capillary water is the source for the wetting of the roofing underlayment and roof sheathing. The driving forces for this phenomenon are extremely large, as indicated by the psychrometric chart (in fact, the vapor pressures are off the pyschrometric chart and steam tables must be consulted). Asphalt roof shingles are the most popular roofing material used on homes across North America, and with good reason. An impermable roofing underlayment will control the transmission of moisture through the roof assembly eliminating both the shingle buckling and the moisture drive into the roof deck. The roof is over 15 years old and showing wear and … When constructing unvented roofs with asphalt shingles in hot humid climates, a vapor barrier must be installed between the asphalt shingles and the roof deck. Contributing editor Ted Cushman responds: With few exceptions, installing shingles on an unventilated roof … For more information, see "RR-0411: Vent on Venting". Wetting of the shingles followed by heating increased moisture in the insulated cavity. Malarkey Highlander 4. CertainTeed has funded a lot of research on the causes of shingle failure, including some long-term studies at university sites in three different climates. They might give out a little sooner than shingles on a ventilated roof, but probably not enough to notice. BSC has identified a low permeability roofing “paper” that decreases the migration of moisture through the unvented roof assembly (see http://www.flexia.ca). Building Science Consortium partner Advanced Energy Corporation (AEC) reproduced the phenomenon of solar driven moisture in the laboratory. This causes the roofing paper and shingles to buckle. This product is cost competitive with standard roofing underlayment but has a permeance of only 0.56 perms (dry cup method). The right roofing can boost the curb appeal of any style of home, from rustic to urban, colonial to contemporary. Asphalt shingle installation: This article discusses best roofing practices for the installation of asphalt roof shingles, including installation temperature, shingle sealing methods, shingle course offsets, asphalt shingle nailing location and specifications, low slope and steep slope limits for asphalt shingles, and roof … The typical roof assembly was asphalt shingles, roofing … Now, there are metal shingles and panels that imitate materials like slate, tile, wood shake and even asphalt. With traditional wood shingle and cedar shake roofs, a receptor for this moisture is typically provided. Unvented roofs in the snow belt may still need some type of venting to keep the roof cold and prevent ice dams. What are some of the most reviewed roof shingles? The research indicates that high temperatures do cut the lifespan of shingles, but only marginally; and it shows that roof ventilation doesn’t have much of an effect on shingle temperature anyway (shingle color and roof orientation are more important). Asphalt shingles on a roof with insulation at the roof deck and no ventilation are hotter than shingles on a vented attic. Asphalt shingles are quite impermeable to the passage of liquid water directly through them. You’ve got to decide if you want to trust them. Clear Matt 100% Acrylic Shingle Shield Roof Coating Is highly recommended. In these studies, shingles were applied on ventilated and unventilated cathedral roofs side by side. FSEC did a literature review of the research on the need for attic ventilation and found that shingle … When constructing unvented roofs with asphalt shingles in hot humid climates, a vapor barrier must be installed between the asphalt shingles and the roof deck. Copyright 1997-2020, buildingscience.com Corporation| Our Privacy Policy | Editorial Policies and Conditions of Use, RR-0306: Unvented Roofs, Hot-Humid Climates and Asphalt Roofing Shingles, Building Performance and Enclosure Consulting, RR-0104: Solar Driven Moisture in Brick Veneer, BA-1511: Field Testing of an Unvented Roof with Fibrous Insulation, Tiles, and Vapor Diffusion Venting, BA-1001: Moisture-Safe Unvented Wood Roof Systems, BSD-149: Unvented Roof Assemblies for All Climates, BA-1409: Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-Humid Climates. The cost of an asphalt roof per square— a square is 100 feet of surface area, which is how roofing … In vented roofs, this is often manifested in the buckling of shingles early in the morning as the moisture migrates in to the roof deck sheathing and the joints close. Working at heights on a roof presents fall … Atlas Pinnacle 8. VITAL COAT 5 Gal. When a moisture reservoir is heated by the sun, water is driven inwards1. If that changes, we will update this post to include their ranking. Warranty on Unvented, Insulated Decks T. echnical. With traditional wood shingle and cedar shake roofs, a receptor for this moisture is typically provided. Asphalt shingles are a reservoir for water and behave similarly to traditional wood shingles and cedar shakes in that regard. I. nformation. It was the perfect coating for my flat shingle roof. This receptor is an air space that can be accomplished in a variety of ways. Almost no roof is put on perfectly; and if you’ve deviated from the manufacturer’s instructions in any way, your claim can be denied. This is because asphalt roofing materials store water from dew or rain. Residential and commercial roofing, shingles, slate, roof ventilation, roof underlayments, asphaltic and TPO roof … Figures 3a-3c illustrate the phenomenon of intermittent bucking of shingles due to solar driven moisture. As the OSB or plywood roof sheathing absorbs moisture, the sheathing expands and decreases the space between adjacent sheets. History. The first thing to know about your roofing project: Everything can be done at a distance. A.Contributing editor Ted Cushman responds: With few exceptions, installing shingles on an unventilated roof deck will void the warranty. Asphalt shingles are commonly used on sloped roofs, single homes, and … Unfortunately, shingle warranties provide little protection, whether or not your roof deck is ventilated. from North America's largest roofing manufacturer. Some of the most reviewed roof shingles are the Owens Corning 7 in. We can even help you find a professional to install it. x 33 ft. (20 sq. Asphalt shingles store water from dew (condensation due to night sky cooling) and rain. The field of participants include: 1. In typical roof assemblies, this moisture is driven inwards through vapor permeable roofing papers/felts into plywood and OSB roof decks, and subsequently through the other side of the roof deck into the attic space. Asphalt shingles are one of the least expensive roofing materials, and they are available in a wide variety of colors. When constructing unvented roofs with asphalt shingles in hot humid climates, a vapor barrier must be installed between the asphalt shingles and the roof deck. The material properties of shingles change under elevated temperatures and moist conditions due to their hygroscopic nature. AEC constructed a mockup of a roof assembly with the insulation installed directly under the roof sheathing. Owens Corning produces high quality asphalt coating, asphalt sealants and adhesives for asphalt shingles While asphalt shingles don’t have the lifespan of ceramic or slate shingles, the affordability is unmatched. (See Figures 1a, 1b, and 1c). The fact that your local building department okayed the installation probably won’t help: As one warranty (from the Canadian firm EMCO, which makes Esgard shingles) states, "Where local building codes have specific [ventilation] requirements that differ from the National Building Codes, the more stringent requirement must be followed.". This is followed by relaxation and opening up of the roof sheathing later in the day—the buckling disappears. Continued solar heating gradually drives moisture out of the sheathing and the buckling disappears. Thanks to digital technology, all of your decisions and interactions — from selecting the right roofer, to choosing a shingle… The preferred method is to prevent the moisture from entering the roof deck material via the installation of a vapor barrier. Asphalt shingles still dominate the US roofing industry, accounting for more than 70% of all residential, sloped roofs including new construction and replacements. And some roofing manufacturers won’t honor warranties if their shingles are … However, metal roofing is surging in popularity as more aesthetic options become available. Pabco Premier 3. Since dew can provide enough moisture to create shingle buckling, the process is repeated daily at certain times of the year. This WUFI Pro modelling shows, that in climate zone 6 - unvented R49 asphalt shingle covered roof can be build without foam, and have a sufficient amount of reserves that enable it to cope with some … 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). Experience the total Owens Corning Roofing System and high quality roofing shingles. Certainteed Landmark Some of you may be wondering why GAF Timberline is not listed here. To keep moisture out of the roof assembly, a roofing … A. This receptor is an air space that can be accomplished in a variety of ways (see, for example, Cedar Breather®). Ted Cushman is a contributing editor at JLC. You’ll find the perfect asphalt roofing shingles for yours in one of IKO’s four collections: … Unvented Roofs and Shingle Warranties While the IRC has approved the use of certain "hot" unvented attics, it seems that asphalt-shingle manufacturers still recommend that their shingles be installed over vented roof … Self-adherent waterproof roofing membranes have proven effective under a wide variety of roofing materials. One of the major concerns of shingle manufactures is that un-vented roofs will increase the temperature of the roof sheathing and shingles, which would lower their life span. Owns Corning Duration 6. We reached out to GAF to see if they were interested in participating in this study, but they did not respond. If you start with a good shingle, what you lose in shingle life (if anything) you probably more than earn back in energy savings from the added insulation thickness. There are additional important considerations and construction details when using unvented attics in hot-humid climates. The most important factor in longevity isn’t the level of ventilation; it’s the quality of the shingle. A U.S. National Board of Fire Underwriters campaign to eliminate the use of wood shingles … Step one in any roofing project is always safety first. IKO Dynasty 5. And even if a warranty is honored, the money you’ll get won’t begin to cover costs like tearoff, disposal, or labor. Bill Rose of the University of … In the end, it comes down to trust: If manufacturers want to back the product up, they will, and if they don’t, they won’t. The better brands of fiberglass shingles are the ones labeled as passing ASTM Standard D-3462. AEC’s roof mockup is shown in Figure 2a – 2d. Asphalt shingles store water from dew (condensation due to night sky cooling) and rain. Asphalt shingles require special attention when installed on unvented roof assemblies in hot-humid, mixed-humid, and marine climates due to inward vapor drive. All roof shingles can be shipped to you at home. Figure 2a (above left): Roof with shingles; Figure 2b (above right): Roof with solar array, Figure 2c (above left): Roof wetting; Figure 2d (above right): Roof insulation. 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Tamko Heritage 7. Asphalt shingles are a reservoir for water and behave similarly to traditional wood shingles and cedar shakes in that regard. Asphalt shingle roofing is a dominant material for residences. With unvented roof assemblies, this inwardly driven moisture must be addressed. Unvented roofs with asphalt shingles in hot humid climates require a vapor barrier between the asphalt shingles and the roof deck. With traditional wood shingle … They were first used in 1903, in general use in parts of America by 1911 and by 1939 11 million squares of shingles were being produced. The real question is, how will the shingles hold up on an unventilated roof deck? At least one manufacturer, CertainTeed, will honor its warranty on an unventilated roof deck, although for a reduced term of ten years (prorated from year one, and with no wind speed rating). The large vapor pressures resulting from incident solar radiation and the changed material properties are sufficient to drive moisture inward through the shingles. They are designed to protect a home through decades of weathering with minimal … That’s probably why you’re here – asphalt shingles … Roofing felts or underlayments vary greatly in their permeability to water vapor; the typical underlayment used under asphalt shingles in residential construction is quite permeable. This phenomenon can typically be ignored in climates other than hot humid climates because the combination of extensive dew formation and solar heating at high outside ambient temperatures is not common. However the geometry of their installation allows wicking at overlaps. If the warranty excludes installations with "improper ventilation," that language may be enough to deny a claim. Many products can be used as this vapor barrier. Let Owens Corning help you determine when it is time for a new roof and then let us help you choose the shingles for your roof that are right for you. If we don’t ventilate under the roof sheathing, what happens to our asphalt shingle warranty? BP Vanguard 2.
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