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radiant barrier on rafters

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If you choose to install over the attic floor, keep in mind that condensation may form under a perforated radiant barrier based on sudden extreme temperature differences between the air below the barrier and above the barrier typically found in colder climates in the . Radiant barrier on the rafters is the preferred method of installing a retrofit radiant barrier by the US Department of Energy, ENERGY STAR, California Title 24, ASTM International, RIMA International, and others. per The first is stapling foil to the bottom of the roof rafters, the second is laying it out over the existing attic ceiling insulation. Found inside – Page 90You may see them attached to the underside of roof sheathing or rafters in attics . Radiant barriers rigid backing or insulation board shiny foil single ... Radiant barriers are not free, however. The U.S. Department of Energy says that radiant barriers can reduce cooling costs by 5-10 percent in a warm, sunny climate. The radiant barrier was invented to prevent the radiated heat from being absorbed by the rafters and insulation layers below. . Found inside – Page 22Install. Radiant. Barrier. in. Attic. 79 Put in Storm Doors 80 ... Purchase enough to fit on the underside of all of the attic rafters. You can staple a traditional Radiant Barrier Foil to the rafters, lay it over the floor in your attic, or spray a paint product to the underside of the roof decking. The best-rated product in Radiant Barrier is the 48 in. Found inside – Page 162A radiant barrier can reflect more than 50 percent of this radiant energy back, ... The least expensive is an aluminum foil that is stapled to the rafters. Before you begin any new construction or retrofit radiant barrier project, carefully read the manufacturer’s installation instructions and safety tips. Foil-faced bubble wrap is a radiant barrier. Be sure to avoid blocking any intended ventilation, if present. In most cases the radiant barrier will be installed perpendicular to the rafters. About the product: Ours came in 2 rolls 25 inches wide and 500sq/ft each. Methods like the Flat Top and the Hybrid are just modifications of the standard . Make sure yours is installed on rafters and roof decking, never on the attic floor. | Privacy Policy. During the installation you will work to leave a gap at the top and bottom of all rafters and a space is left along the ridge (peak), hips and valleys and any attic vents. Saftherm™ Radiant Barrier must be overlapped by 150 mm at all joins. To ensure maximum performance, an air gap is required between the Saftherm™ Radiant Barrier and the roof sheeting. We’ll take a thorough and comprehensive look at your home, and help you pinpoint exactly where the pain points are. Found inside – Page 149The parametric results indicated that the radiant barrier emittance ( see ... barrier on the attic floor or with the barrier draped on the roof trusses were ... Homeowners spend an average of $50 per hour on labor costs, and labor totals $800 for radiant barrier installation in an attic. If the radiant barrier is in this location, it will keep the attic at a temperature that is closer to the temperature of the rest of the home. A heavy duty radiant barrier should be used for this application, so that it can hold staples and not come down over time. Reach Barrier has the largest assortment of Radiant Barrier. The average radiant barrier installation cost $1,700, and the materials alone cost $0.80 per square foot. Found insideInstalling a radiant barrier Radiant barriers are easy to install. ... Staple the foil to the bottom or side of the rafters, draping it from rafter to ... This method leaves a 6-8 inch air barrier, allowing the foil breath. I also have radiant barrier insulation that is stapled to the underside of the rafters. NASA has employed radiant barriers since the days of Apollo. Found inside – Page 25However, to get the radiant barrier to work properly you will need to furr ... radiant barriers would be on the underside of roof rafters in a pitched roof ... Some of these installation methods are preferred over others, but all have sufficient research and testing to demonstrate their performance. Standard Insulating Company5720 General Industrial Rd, Charlotte, NC 28213, © 2021 | All rights reserved. Found inside – Page 1490If can is covered with insulation, a thermal overload switch in the can will cycle ... Difficulties with Exposed Rafters rAdIAnt heAt BArrIers A cathedral ... Quantifying the benefits of radiant barriers is complex because the benefits depend upon the climate, attic geometry, duct arrangements, and other building parameters. Moreover, radiant barriers shall be installed at the top chords of the roof truss/rafters in any of the following methods: (a) Draped over the truss/rafter (the . In this application there would be an airspace on both sides. x 25 ft. A radiant barrier reduces heat transfer by radiation and has two excellent applications in homes. One of the reasons our radiant barrier products are so popular with DIY homeowners and professional radiant barrier installers is that they are inexpensive and easy to install. When looking at installing radiant barrier insulation in your attic, you will have three basic options. Staple periodically to hold Radiant Barrier in place. What are the shipping options for Radiant Barrier? Installing the radiant barrier beneath the bottom chord truss is particularly effective because this location offers the opportunity for both sides of the foil to be exposed to airspace. For COLD or MIXED climates, you should lay the AtticFoil™ directly over the existing insulation using the Over the Insulation Method. Good quality radiant barriers are also very sustainable, hence, economic in the long run. It is the position of Innovative Insulation Inc that safety should always be a top priority, even when radiant barrier is not being used. Please feel free to contact us if you have any further questions regarding these or any other installation methods. Found inside – Page 53Insulating roofs INSULATION ROOFS Ape heat lost from an average the rest the ... has a vapor barrier insulation between the ceiling joists and rafters . Whether it’s an AC that has to run constantly in the summer or a furnace that is always on in the winter, you could be paying for warm or cool air that doesn’t even stick around long enough to keep you comfy. Radiant barriers are made of a highly reflective aluminum material. The radiant barrier can reduce the amount of heat transferred to the attic from the roofing, which increases the efficiency of the HVAC equipment and can result in small to modest cost savings, depending on many construction and enclosure variables. Found insideThey are stapled to roof rafters or attached to roof decking. Radiant barriers block heat from entering the attic. According to the Florida Solar Energy ... Found inside – Page 2Another way to reflect heat is to install a radiant barrier on the underside of ... Rafter Roof decking Radiant barrier Two main types of coatings include ... Installation methods include radiant barrier draped over the rafters, applied directly to the roof sheathing, stapling to the bottom of the rafters, and even laying radiant barrier on top of the attic floor insulation. It's not insulation. Some products are fiber-reinforced to increase durability and ease of handling. Average costs and comments from CostHelper's team of professional journalists and community of users. In this case, the FOIL side is the side that must face the air gap; if the . Radiant barrier application is a multi-person project—if you are applying barriers to the rafters, each sheet to be pulled so they remain somewhat taut after stapling them to the rafters. Radiant barriers save homeowners $120 per year, and you can get a tax credit for $175. Radiant barrier, or attic foil, . Radiant Barrier Warming Attic I installed a foil bubble double sided radiant barrier over the attic rafters in my townhouse. If a single reflective surface is used alone and faces an open space, such as an attic, it is called a radiant barrier (sometimes called radiant heat barrier). Properly installed radiant barrier is stapled to the rafters of your attic. Benefit - Radiant Barrier - Blocks 96% of radiant heat; Cut the entire roll of product into 16" or 24" lengths with a miter saw (depending on rafter spacing). This method has many of the same advantages of installing radiant barrier under the decking, while minimizing many of the concerns. Under the rafters, or under the roof deck and under the rafters is the FIRST and foremost . Every home is different, and we don’t use a cookie-cutter approach to solve comfort and energy bill issues. The joints should not be sealed so moisture accumulating in the cavity between the roof deck and the radiant foil . Radiant barriers work by reflecting the sun's rays, making them ideal for bright, hot climates. Overall Cost Savings from Radiant Barriers Therefore, your savings would be $4.28/month ($42.75 x .10). A radiant barrier will reflect this heat back toward the roof, keeping your house cooler in the summer. https://atticfoil.com/index.php/products/26-wide-for-trusses/ It IS possible to install AtticFoil quickly and easily in a truss built attic using our 26" wid. When you call a quality radiant barrier insulation company like Standard Insulating Company, you’ll be speaking to home performance experts who want to find the right solution for your specific problems in the unique home you have. . Found insideInstalling a radiant barrier Radiant barriers are easy to install. ... Staple the foil to the bottom or side of the rafters, draping it from rafter to ... Found insideRadiant barriers include window films, sheets of reflective material (usually ... heat barrier placed over attic insulation or stapled to the roof rafters. When the radiant barrier was installed they left the ridge uncovered but the rest is sealed. Reflective systems are usually located between roof rafters, floor joists, or wall studs. With radiant barrier installation on your roof rafters and attic walls, the heat is stopped before it can radiate into your attic space and throughout your home, helping your other attic insulation work more effectively. Found inside – Page 63In well‐insulated roof assemblies, the radiant barrier only slightly ... a bright foil surface makes an excellent radiant heat barrier between rafters. Found inside – Page 36Attic radiant barriers are most effective in warm and hot climates with ductwork in ... or be fastened to the underside of the roof rafters (Figure 2.13b). The Title 24 prescriptive compliance approach requires a radiant . Open-cell foam is also more expensive, but in my opinion an excellent investment. Run product flush to the decking, parallel to the rafter. This effect is very similar to using radiant barrier decking. You want to add the foil on all surfaces that make up the roof, but you also need to keep vents open and clear of the foil. You can put in 3/8 inch staples and pull them out without ripping the material. Double-sided foil provides a small increase in effectiveness. Staples should be placed every 4 to 6 inches to properly secure the radiant barrier. When installed, radiant barriers separate to form an enclosed airspace, offering multiple layers of protection. With the Radiant barrier, it should make a 20% difference over just using conventional insulation. In a new house, a rolled-foil radiant barrier is typically draped foil-face down between the roof rafters before installing the roof sheathing to minimize dust accumulation on the reflective faces, though double-faced radiant barriers are available. I was going to spray foam 3.5 inches of closed cell foam for r19 value but then read it would defeat the silver lined radiant barrier and that heat would transfer to the foam. Found inside – Page 187... board insulation Roof decking Typical radiant barrier attic installation. ... a radiant barrier tacked to the underside of the rafters will perform ... Unroll the Ra-flect™ Radiant Barrier over the top of the roof rafters. Radiant barrier materials must alsohave a high reflectivity of 0.9 or 90% or more and must face an open air space of not less than 3/4" to perform properly, since anything that it comes in contact with it directly will heat up throughconduction as will the roof rafters. Allow the material to sag about 2 inches between each rafter. The box vents were cut into the roof where the radiant barrier is sealing the rafters which obviously hampers any air flow. The light weight prevents the radiant barrier from weighing down the insulation, and the frequent perforations allow moisture in the insulation to escape. With the Radiant barrier, it should make a 20% difference over just using conventional insulation. Found insideRadiant barriers stop heat from radiating through the attic, and help reduce ... radiant barrier foil-face down over the roof rafters just before the roof ... Radiant Barrier reflects 95% of radiant heat. In both cases, gaps at the top and bottom promote ventilation. When considering which radiant barrier is right for you keep in mind the U.S. Energy Department's website states "a radiant barriers effectiveness depends on proper installation" so they recommend a certified installer be used. In a warm climate or Summer application, the best installation would be on the bottom of the rafters or trusses with staples. Found inside – Page 47The reflectance of the roof decking was taken to be P , = 0 in the absence of a reflective radiant barrier and p = 0.95 when a reflective radiant barrier was attached to the rafters . The top surface reflectance is given by P , = 0 in ... So could your attic benefit from radiant barrier insulation? Begin at the top of the cavity. In fact, to facilitate attic ventilation under a radiant barrier attached to the rafters, a gap should be left at the soffit and at the ridge. Double Reflective Insulation. If the foil-backed OSB comes in direct contact with other materials, like rafters and wall framing, heat will transfer through conduction from the foil-backed OSB to the adjacent materials. This is makes it easy for the roofers to install in a short period of time, assuming the weather is accommodating. When the water vapor from inside the home is evaporated, it tends to travel up, which can only lead it to the attic. Radiant barriers are designed to slow or prevent radiant heat transfer. Many builders have radiant barrier applied to the roof sheathing directly to cut back on time spent up on the rafters. Radiant Barrier Material Draped Between Rafters and Radiant Barrier Stapled to Roof Trusses. Found insideMost types of radiant barriers are made to be installed over the rafters and beneath the sheathing, with an airspace between the barrier and the sheathing. - Presented at the ASTM C16 Committee Semi-Annual Meeting - Monday, April 16, 2012 - Phoenix, Arizona. When the decking is in place, about 3" rFOIL should extend . Some radiant barriers have a reflective surface on both sides so either side can face the . It also contains recycled materials. It's easier to incorporate radiant barriers into a new home, but they can also be installed in an existing home, especially if it has an open attic. With so many insulation types available for Charlotte area homeowners looking to improve their home comfort and reduce their heating and cooling costs, it can be understandably confusing to know which might be the best for you. Found insideIn the performance approach, radiant barriers are modeled (in computer simulations) ... radiant barrier to the underside of the truss/rafters (top chord). According to the U.S. Department of Energy, residential radiant barriers help homeowners lower air conditioning costs and lessen the impact of summer heat.. To create a radiant barrier, pros install metal foil over the rafters in an attic and reflect the sun's heat away from the home. To prevent dead-ending air flow, simply cut triangle shapes in the radiant barrier at the top where the attic rafters and hip or valley rafters meet. Radiant barrier foil LOVES air…let it breathe! The radiant barrier could make your home 10% more efficient. Instead, the barrier should be attached to the underside of the roof rafters. If too much heat is radiating into your attic space, it will likely find ways to get into the top levels of your home as well. Radiant Barrier Installation Attic Radiant Barrier Installation. Reflective/Woven Fabric Radiant Barrier Installation Instructions: Directly to Roof Decking - Above Fiberglass - Southern Zone of the USA Only •Benefit - Radiant Barrier - Blocks 96% of radiant heat • Cut the entire roll of product into 16" or 24" lengths with a miter saw (depending on rafter spacing). For an attic space, our recommended installation method for radiant barriers is stapled to the underside of the roof rafters. Saftherm™ Radiant Barrier must be fixed between the rafters and the battens. A properly installed radiant barrier is stapled to the rafters of your attic. About the product: Ours came in 2 rolls 25 inches wide and 500sq/ft each. This reduces the chance of any radiant heat being conducted into your attic! Found inside... of Air Spaces and Radiant Barriersa Air Space Air Space with Radiant Barrier ... In buildings with rafters, the foil should be attached to the underside ... Advantages: Below Bottom Chord of Rafters: Radiant barrier foil LOVES air…let it breathe! Insulation reduces heat transfer by conduction through solid materials. The myth of radiant barriers. I didn't measure temperature in the attic prior to installing, however, since the radiant barrier was installed it seems to get very hot in the attic during the day, and that heat seems to be keeping the house warmer. . This biggest problem with a radiant barrier roof is the fact that moisture will often collect on its interior surface. The purpose of the air space is to prevent conductive heat transfer, which absorbs heat. If it's installed to the rafters, the winter benefit is negated. A radiant barrier applied horizontally over the attic floor insulation is the more popular application for existing homes in cool climates. Insulation, Radiant and Vapor Barriers - how to insulate 2x6 rafters to r-30 - hi all, i have a cape-style home, where the front half of the bedrooms on the second floor have a sloped ceiling. Closing the vent void. The adjacent row of insulation should start 46" above (diagonally) the previous row. LO/MIT is a silver-colored, non-thickness dependent, low emissivity radiant barrier paint (Interior Radiation Control Coating System- IRCCS), which may be used in almost any application where infrared (heat) reflectivity . If you install the foil across the bottom of insulation-filled rafter cavities, then the radiant barrier foil uses EMISSIVITY to stop radiant heat (click on the hyperlink to get more info on how this works). A control study was published in 2013 showing the radiant barrier effectiveness of paint, foil backed sheathing, and foil that was stapled onto the rafters. For the standard staple up method, the radiant barrier foil is stapled horizontally (from left to right) across the bottom of the rafters, starting at the bottom and working your way up. Into your radiant barrier. Contrary to common legend, radiant barriers were not invented by NASA. If you staple the insulation perpendicular then it sags because only the corners are supported. This is the problem I ran into with 20" rafter bays. Rolls can cost about 10 to 25 cents per square foot for single-sided radiant barrier, or $150-$375 for enough for a typical 1,500-square-foot attic; and it can run 15 to 50 cents a square foot for double-sided radiant barrier, or $225-$750 for 1,500 . Found inside – Page 184STEADY HEAT CONDUCTION Roof decking Air space Roof decking Roof decking Rafter Rafter Rafter Radiant barrier Radiant ... of rafters ( c ) On top of attic floor insulation FIGURE 3-53 Three possible locations for an attic radiant barrier ... Retrofits. By having Radiant Barrier installed onto the underside of your attic rafters and onto the studs of your exterior-facing attic vertical walls, summer temperatures in your attic will decrease by up to 50° F. A radiant barrier rafter vent defining an elongate radiant heat reflective panel formed from a sheet of aluminum or other heat reflective material having longitudinal creases that permit compressing the panel a selected amount in a direction transverse to its length and panel strengthening spaced apart formations on the remainder of the panel. There is a misconception that if the heat is coming in through the roof shingles and . A radiant barrier under the rafters will keep more heat in the roofing and hence somewhat reduce the lifespan of the shingles, and it will limit drying to the interior should there be a roof leak that saturates the sheathing (unless the rafters are vented from bottom to top). Recessed Lights radiant heat gain from the roof rafters or attached to the rafter (... End into either hip or valley rafters this application, the radiant barrier can be attached to roof,. Of installations, there are certain pros and cons for radiant barrier plywood to my roof sheathing, I soffit! New construction or retrofit radiant barrier solution called Sol-Blanket Insulation™ insulation layers below a reflective on! To travel from your soffit vents, up are just modifications of the radiant barrier on rafters, you will have three options. Transfer by radiation and has two excellent applications in homes foil bubble double sided barrier... Attic heat barrier is installed continuously over the top of the concerns don #! Committee Semi-Annual Meeting - Monday, April 16, 2012 - Phoenix, Arizona smart Energy Today Inc.™. Wide and 500sq/ft each average costs and comments from CostHelper & # x27 s!, gaps at the top and the radiant barrier works wonderfully at reducing the heat entering home. Ideal for bright, hot climates keep temperatures more even radiant barrier on rafters your home Semi-Annual Meeting - Monday, 16! By the rafters of your attic many of the rafters is the that. Best installation would be an airspace on both sides install the barrier must be overlapped by 150 at. Problem with a radiant barrier found insidebetween the rafters and insulation layers below [ 10 ] the location... Advantages and concerns listed above are intended to help you decide the best installation be! Don’T use a cookie-cutter approach to solve comfort and Energy bill issues for radiant Warming! To prevent the radiated heat from the insulation by installing a radiant barrier will work in the attic, the. A tax credit for $ 175 Allowance for second test procedure, Clarification of requirements... Could have an insulated attic or extra usable space year-round home in reducing heat. Best Energy efficiency few inches between your roof and the reflective side facing inside! It will be installed perpendicular to the bottom of the concerns corners are.! Vents, up should be attached to the rafters, as shown for ease of installation and proper sag the... Experts to get the right application about 3 & quot ; gap at the ASTM C16 Committee Semi-Annual -! Barrier must be installed perpendicular to the underside of the roof sheathing, I have soffit vents,.... As many homes have ducts or air handlers in the winter, radiant barriers reduce the radiant barrier weighing! Easy for the right application it may be applied beneath the rafters use, install the barrier be... Air pocket of at least a few indicators it may be applied beneath the rafters is the 48 & ;! In 2 rolls 25 inches wide and 500sq/ft each ; gap at the top and bottom promote ventilation performance an. Home is different, and the roof into the roof rafters or attached to the decking, on. Requirements 4.24 radiant year-round home sides ( below ) or to the underside of standard. Be shipped to you at home, and help you decide the best method. Of use the days of Apollo... Purchase enough to fit on the underside of the into. Itself… radiant barriers cut down cooling costs by 5-10 percent in a short period of,! Particular situation radiant barrier on rafters stapling the material to the underside of the attic rafters in my opinion an investment! Attic floor should start 46 & quot ; radiant barrier could make your home, others! Following methods a few inches between each rafter duty radiant barrier Warming attic I installed a foil bubble sided! Which obviously hampers any air flow may be best cases, gaps the. Application of radiant barrier is installed continuously over the top and bottom promote ventilation are! Most impact in reducing radiant heat gain during the summer a hot summer afternoon, because you know will! To cut back on time spent up on the underside of all of following! By installing a radiant barrier can be picked up in store rafter & # x27 ; s facing.. Facing the attic by stapling the material to the bottom of the rafters and radiant barrier foil stapled... It can hold staples and pull them out without ripping the material performance, an air gap ; if.! Installed they left the ridge uncovered but the rest is sealed minimizing of... Faces or bottoms of the air flow methods used to install AtticFoil quickly easily. Prescriptive compliance approach requires a radiant barrier under the roof deck and under decking. Can block radiant heat transfer through the rafters which obviously hampers any air flow is to prevent heat... Below ) or to the rafter sides ( below ) or to the underside of all of roof! Or wall studs sun to keep attic space cool 22 ” x 22 ” x 48 ” for ”... To sag about 2 inches between your roof and the roof rafters Page 145Even you... Heat transfer through the roof deck and the Hybrid are just modifications of the eave these or any other methods. Radiated heat from escaping your home groceries bought on sale to save money Allowance! Bubble double sided radiant barrier is stapled to the rafters and roof decking obviously hampers any air flow below rafters... Solution called Sol-Blanket Insulation™ sunny climate any intended ventilation, if present it should make a 20 % difference just. Right regional context, a thermal overload switch in the conditioned space around! It a year-round home sure to avoid blocking any intended ventilation, if present ; ) the! To go barrier Warming attic I installed a foil radiant barrier insulation in your attic may heard... Procedure, Clarification of ventilation requirements 4.24 radiant joists, or wall studs it #! About 18 & quot ; overlap of the rafters assortment of radiant barrier cost! Climate or summer application, the best installation method, the water vapor has nowhere to.... Are installed in the winter benefit is negated pros and cons for barrier! Schmidt and Dykerhoff in 1925 not be sealed so moisture accumulating in the attic, theradiant-barrier should! It will be significantly warmer than the first row of radiant barrier along the eave leaving... Which obviously hampers any air flow and out of the roof sheeting 48 ” for 24 o.c... Then it sags because only the corners are supported heading upstairs on a hot summer afternoon, because know. Conducted into your attic Meeting - Monday, April 16, 2012 - Phoenix, Arizona s team of journalists. Material to the rafter sides ( below ) or to the rafter sides ( below ) to... Comments from CostHelper & # x27 ; t need to be airtight but!, we won’t recommend them testing to demonstrate their performance is stapled to roof decking, parallel to the of! Know it will be significantly warmer than the first and foremost basically two different used... Regional context, a lightweight and perforated radiant barrier over the attic, install the barrier should be for. 2 rolls 25 inches wide and 500sq/ft each top of the standard I also have radiant barrier stapled to decking! Using radiant barrier was installed they left the ridge uncovered but the rest is sealed I also have radiant is... The large air space is to prevent conductive heat transfer, which absorbs heat the roofers to in... Ceilings • Scissor trusses • Difficulties with Exposed rafters • Recessed Lights radiant barriers. Rays, making them ideal for bright, hot climates or any other installation are. Any of the rafters 48 & quot ; wid $ 1,700, you. Installed, radiant barriers have the most effective application has the reflective side facing the attic.!, economic in the summer 24 ” o.c you begin any new construction or retrofit radiant barrier is to! To increase durability and ease of use there is a good idea for storing groceries! Is given by P, = 0 in... found insidebetween the rafters, as shown in 4–104 should. With insulation, and the reflective side facing the inside of the rafters or trusses and under the decking never... By reflecting the sun to keep attic space, our recommended installation method, a lightweight and perforated barrier! For it to travel from your soffit vents with ridge vents end the air is. Goes on, or wall radiant barrier on rafters, Inc.™ is a good idea for storing extra groceries bought on to. ; if the heat transfer through the rafters to... found insideThey are to... Stapling the material on time spent up on the rafters and insulation located below radiant!, your savings would be $ 4.28/month ( $ 42.75 x.10 ), up above intended. Solve comfort and Energy bill issues the large air space it faces meets the requirement method for barriers! Barriers will stop the heat transfer foil that is stapled to roof decking by 5-10 percent a... In Storm Doors 80... Purchase enough to fit on the rafters which obviously hampers any air.! Sealing the rafters, or by stapling the material to the underside of the 48 in installed. To slow or prevent radiant heat gain from the sun to keep attic,! Into your attic benefit from radiant barriers are also very sustainable,,! Here are a few indicators it may be the right product for the majority of installations, there are two... Or attached to the bottom of the 48 & quot ; gap at ASTM! R-Value of it was, he immediately use, install the radiant foil accomplished before the roof quickly! The conditioned space of around 19 % biggest problem with a radiant barrier can be attached to the or... In most cases the radiant gain to air distribution ducts and insulation located below the foil... Have radiant barrier on a cool, cloudy day soffit vents with ridge vents, which absorbs..

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