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Our company performs this work in Long Island, and you can go to the Long Island Power Authority (LIPA) website to search for other participating contractors near you. Asked by Ralph Fumante Jr., Oyster Bay Cove, NY, Long Island Power Authority (LIPA) website. Overhangs that extend this far, especially on the south side, will significantly reduce the internal solar gain of your home during the summer, when the sun is higher in the sky. Blow in the fill between and over the joists rather than across them. You might also need to remove and replace the current insulation if it has become damaged over time from the exposure to outside air. Can I install batt insulation over it to increase the R-value?". You can buy them unfaced or simply remove the paper or foil backing. From types of insulation and materials to target R-values and installation, this guide breaks down what to consider when insulating your attic yourself. They come with or without a paper or foil facing that acts as a vapor barrier. To get the target R-value from the product you chose, use the number of bags your calculations showed that you needed to insulate your attic—never fewer. If you've reached your target depth but still have a few bags left over, keep adding the material at an even depth throughout the space until all the bags your calculations called for are empty. For DIY attic insulation, you've got two choices: loose fill or batt (the common term for blanket insulation). Insulating your crawl space will keep the area dry, clean, and pest-free. You can pour the fill in place and spread it manually, but the process is much more labor-intensive and the results won't be nearly as good. Dear Erik, I read your article with great interest. Make sure the fill's depth is uniform across the attic. The main factors that impact the cost are: Note: If you have to insulate around electrical boxes or cables, then support from an electrician might be needed as part of the process too. Ideally, cables should be clipped to the roof joists or gently lifted out of the way and then laid over the insulation once it is in position ... You’ll need to start laying with a minimum gap of 25mm between the eaves and the insulation to ensure a suitable air gap. Don't leave any gaps between batts and joists, obstructions, or abutting batts. Many people forget the roof when considering insulated sheds, but if inadequately provided for, … One important thing to remember is that insulation should never be pushed right into the eaves because it will interfere with airflow. Though some batts come with a paper or foil facing that can act as a vapor barrier, Tom Silva prefers to use 6-mil polyethylene sheeting, cut to fit between the joists and with seams sealed by foil tape, to prevent moisture from seeping into insulation. Adjoining batts should be butted snugly together, but not tight enough to compress them. The Department of Energy estimates that a properly insulated attic can shave 10 to 50 percent off your heating bill. That means drawing air … The present insulation is between the floor joists in the attic and it continues over the soffits of the eaves. Measure your attic's square footage. Here’s why… Heat – The Great Escapist. Owners of houses built before 1990 take note: If what you see is lightweight, grainy, loose-looking insulation with shiny flecks, it could be vermiculite from a mine with asbestos deposits. I guess that's possible, depending on what the access from the eaves and the loft is like, but I think you'd struggle to get rigid insulation in there neatly, and kept tight against the l & p. If you were to try this, I reckon you'd actually have more success with soft loft insulation, but you'd need to ensure it would stay in place and not slip and block the ventilation route. Insulation is an absolute necessity,… To be effective, insulation needs to provide a continuous barrier to heat loss. To provide ventilation in a roof that is insulated… However there are certain scenarios and reasons like sound proofing to insulate between floors. That’s why the 9/11 Commission comparison is relevant. Read Danny Kelly's Q&A "I recently had blown-in cellulose put in my attic. Loose-fill insulation is usually... Duct Insulation. Such ventilation keeps the roof cold in winter, which prevents ice dams that can damage your roof and even your house. If you're considering turning your attic into conditioned storage or living space, it's worth changing tactics to insulate between the rafters and wall joists instead of the floor. Ask our knowledgable panel of professionals. Covering up the soffit vents with loose fill or batts, which can happen if you stuff insulation along the eaves, is a huge no-no. Made of: Fibers from recycled denim cloth. Continue the insulation right to the edge of the ceilings but do not allow it to block the eaves’ ventilation. If you’re building a new... Cathedral Ceiling Insulation. Because it’s hard to insulate these areas, many Capes leak heat at the eaves—a recipe for ice dams. Thus, it is important to insulate a loft correctly but also to add vents in the right places. Whether using loose fill or batts, put the vapor barrier closest to the warm side of your installation, where hot, moist air would get in—facing the house's interior in cold climates (beneath floor insulation) and the attic's interior in hot climates (on top of floor insulation). In a perfect world, you'd hire an energy auditor to tell you exactly how much protection you're getting from the few inches of attic insulation you may already have and to pinpoint things like air leaks that you can seal to make sure your insulation will do its job well. Eaves can define the architectural style of a house, as well as be a functional detail. Eaves blocked by foam insulation: some older homes were super insulated during the energy crisis in the U.S. in the 1970's by pumping urea formaldehyde foam insulation (UFFI) into building cavities. To answer simply: no, your soffits should not be insulated, and there is a chance that your insulation has been damaged by this. But if the floor is covered in plywood, you can't stuff enough insulation beneath it to do the job sufficiently—not even in warm climates. To answer simply: no, your soffits should not be insulated, and there is a chance that your insulation has been damaged by this. I want to add more insulation to my attic. In open or unheated spaces, water standing in the pipes can freeze, breaking the pipe and causing water damage or flooding when the pipes thaw. A home warranty may help. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams, and the material will block that flow. Always use unfaced batts, both when laying product for the first time and to prevent moisture from becoming trapped between new and old layers of insulation. I would suggest opening Windows . Rather than trying to cut off the crawl space from the conditioned upper floors, you should bring the crawl space nearer to upper floors' temperatures by leaving off the underfloor insulation and by sealing the crawl space against outside moisture and temperatures. Fasten blocking around the hatch or door to allow the material to be installed around this area without escaping. Eaves ventilation should … The numbers are based on your house's location and climate zone. On a positive note, congratulations on having 24-inch eaves. Answered 5th Jan 2015 Like 4. In either case, get an extra bag or roll—you really don't want to run out when you're almost done putting it in. This phenomenon, known as wind washing, dramatically reduces the insulation's R-value and could permanently damage insulation material as well. Newer open celled (Icynene®) closed cell foams are in use today. Sure, you can dial down the thermostat and get used to wearing bulky sweaters indoors to cut costs. Overhangs that extend this far, especially on the south side, will significantly reduce the internal solar gain of your home during the summer, when the sun is higher in the sky. Some homeowners block this airflow with excess loft insulation. The problem with insulation extending into the soffits is that air getting sucked in through the soffit vents runs over the insulation. On a positive note, congratulations on having 24-inch eaves . Here are a few of the other advantages you’ll enjoy if you insulate your crawl space. As for your desire to add more insulation, I suggest you have a building analyst come over and inspect the situation. Blown cellulose insulation will require the installation of netting over the rafter pockets. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams, and the material will block that flow. Bottom line: Commonly used and inexpensive, but fibers can irritate lungs and skin (though less so than in years past, thanks to better manufacturing), and it's less effective at blocking airflow than other materials. To help the material achieve the right density as you install it, hold the blower hose parallel to the floor and the floor joists. Insulating between rafters will do no good, because the attic should be ventilated, and the rafter insulation would be between two unheated spaces. How Important Is Using Baffles in Attic Insulation?. Once you've decided which type is best for you, examine the material options and prices to home in on the right product. The Department of Energy recommends these minimum R-values for unfinished, unconditioned attics. Gaps in the attic or between the lower floors and the attic will let heated (or cooled) air escape to the great, unconditioned outdoors, making any insulation you add essentially useless. Here's the scoop on what you need to know about eaves. All insulation to be continuous to avoid thermal bridging. Yes it's cold but to exchange air that is what is needed airflow . This allows the loft to breath but keeps the home warm. Energy & Environmental Building Association's online bookstore. This directs air from the outside upwards, along the baffle, instead of across the insulation. Grab a tape measure and a flashlight to see what kind of insulation you already have in the attic and how deep it is. There's no getting around it: If your house is in a cold climate, keeping it warm in winter is expensive. Loose laid loft insulation should be laid: level, covering all parts of the ceiling; with all service holes sealed, and debris removed before laying insulation. Bottom line: Lighter in weight than cellulose or mineral wool, but it settles more than those materials, so you've got to put in a thicker layer to get the protection you need. If you’re going for a warm loft then you’ll need much more insulation to be able to cover the underside of the roof along with the gable and party walls. Instead, the thermal insulation should be installed more or less flush with the wall, so I need not fill the cavity entire. https://www.greenbuildingadvisor.com/article/insulating-tight-spaces-eaves The paper will fold over the rafter framing, thereby allowing for attachment with staples. Even narrow ones will let air escape. Keep reading for the details. Place a new layer of unfaced batts perpendicular to the old layer, to cover any gaps in the lower layer. Within the material, there is a lot of air that provides the R-value, and for this reason, batt insulation should be loose fitting. Having a Home Performance with Energy Star contractor perform the work makes you more likely to receive financial incentives or rebates and usually assures a quality job. Can I install batt insulation over it to increase the R-value? Bottom line: The most common blown-in material used, but it can rot and grow moldy if exposed to moisture. Air-sealing is always a good idea while you're making changes to the attic anyway; it will increase the lifetime of your insulation and minimize damage done by airflow. Then use the numbers in the chart at right to estimate its R-value. The insulation should be installed with the paper facing out and attached using staples. Most have second-floor bedrooms with 4-ft. kneewalls against the sloped ceilings. Use a piece of plywood as a cutting surface, and stand on a scrap 24 as a straightedge to guide your cuts. It could be that you only need to air-seal rather than adding insulation. Work from the perimeter of the attic toward the door or hatch so that you don't trample all over the insulation you just put in. Eaves consist of two main components — the soffits and the fascia — which work together to create an end cap on the roof that keeps out moisture and pests while regulating air flow through your attic. Batt insulation is typically made of fibreglass or mineral wool. Hope this helps. But those aren’t the only benefits. Eaves ventilation is important as it creates an airflow through the lower section of the loft and can help prevent condensation. Always check labels for specifics on whatever you buy. Always cut batts to fit around obstructions and penetrations. Fibretechs. Insulation shouldn't be laid over any electric cables. Made of: Fibers from rock or recycled slag from blast furnaces. If the first floor soffits open into the joist bays, these should be air sealed and insulated. Insulating the eaves of your roof is essential, and not doing so will seriously compromise the overall effectiveness of your insulation. But if you can't afford to shell out a few hundred bucks for this service, never fear: We've rounded up all the most important know-how about attic insulation costs, products, prep work, and installation right here. Bottom line: It's naturally fire-resistant, but the product is more expensive than others. So fitting insulation in your loft, attic or roof space is a great way to improve your home’s cosiness factor. On a positive note, congratulations on having 24-inch eaves. The major problem is that, it being a log house, the roof assembly may over time slide a little on the rafters down the top of the wall, as the wood loses moisture and settles. (Find a diagram of common air leaks here.) Always cover the tops of the ceiling joists to make sure the insulation is deep enough to reach your target R-value and to prevent thermal bridging, the heat loss that occurs through the wood framing. Because the simplest and cheapest way to insulate an attic is to add material to the floor. Shower thoroughly after you're done for the day to remove fibers from your skin, and launder your work clothes after one wearing. You add one or more layers to achieve the desired level of insulation. Some pros prefer it to utility knives because the large blade easily slices through the thick material. How to Better Insulate Eaves at Old Houses - StarTribune.com Loose-fill or batt insulation is typically installed in an attic. Roofing material of some sort would also be beneficial to insulating the roof. Phenolic foam eaves insulation: To BS EN 13166 or Agrément certified. Instead, cut a thin strip of the insulation you're using to size. And there’s even more good news: it lasts for more than 40 years and should pay for itself many times over in energy bill savings, as the cost of loft insulation is comparatively low. The … Stop using your attic for storage. Never lay heavier batts, such as cotton, over lighter ones, like fiberglass. When beginning a reroofing project, roof insulation should be at the top of your list! Insulation fibers are packaged in bags and blown in place to the desired depth and density using special machinery you can rent from a home center. Tip: Use a Chef’s Knife to Cut Batts. Pull up and dispose of any material that's compressed, water stained, or moldy—it's useless. Batt Insulation. The layer of insulation should continue over water tanks but do not insulate directly underneath – warmth from the rooms below can help prevent freezing. According to Home Advisor, insulating your attic can cost between $1700 to $2100. For batts or rolls, calculate the number based on the width and length of the product you're using. Here's a quick primer on fixing draft-prone spots. Most federal tax credits for weatherizing your house and boosting its energy efficiency expired in 2011. Should the soffits be insulated like this, or should insulation stop at the top of the exterior walls? Get it tested, and if necessary, call in a pro to remove and haul it away safely. And this illumination should be insulated as much as possible from partisan influence. The Department of Energy predicts that prices for natural gas and heating oil will rise again this winter compared with last—and that's after a year in which heating-oil prices rose sharply in most parts of the country. Attics with standard joist spacing, especially those with no insulation, Attics with few obstructions or penetrations to work around, Attics with sufficient headroom for maneuvering during installation, DIYers who don't mind cutting the material to fit around obstructions. They have some great books and builder's guides on home insulation and energy efficiency. How to Cut Batts of Fiberglass Insulation, Contractor or insulation installer’s fee, Attics with irregular or nonstandard joist spacing, Attics with lots of obstructions and penetrations to work around, Attics where there is existing insulation to be topped, since it fills gaps and joints well, Low-clearance attics with limited headroom for maneuvering during installation, DIYers who want to get the job done quickly and are comfortable working with power equipment, Made of: Recycled glass or sand that's melted and spun into fibers. "It's a DIY project you can tackle in a weekend, and the savings you'll get add up every year," says TOH general contractor Tom Silva. Why? Foam blocks airflow needs no vapor barrier and has a higher R-value per inch than loose fill or batts, so you'll get more protection with less depth. I recommend the. How much insulation should I have in my attic? To make it easy to eyeball how level the material is as you blow it in, screw depth guides to joists throughout the space. In either case I plan to add rafter vents. My question is , one side of my basement is about 50% out of the ground(the way it was landscaped to take advantage of the view), and should I insulate the ceiling near the wall that is out of the ground or should I make sure to insulate … Made of: Fibers from recycled post-consumer paper that are treated for insect and fire resistance. With the floor gone, you'll have to find a spot elsewhere for stashing those off-season clothes and that holiday decor. The ventilators allow air to flow in one side and out the other bringing in fresh air and exhausting the moist and damp air from above the insulation. ... the eave is the angle where the roof meets the outside wall—a good place for insulation, as long as it doesn't get into the soffit (the underside of the overhang). The idea is to condition the crawl space, much in the same way that you might condition other parts of your home. Installing baffles will let the insulation extend only enough to cover the top plate, no further. But your state's energy office or local utility may offer product rebates, discounts, or other financial incentives for insulating. How To Insulate a Cantilevered Overhang. Older Cape Cod–style homes may be charming, but they are often poorly insulated. Floor insulation Any one of the rigid board insulations will work, but polyioscyanurate has the best R-value (6 to 7 per inch). 3. Attic rulers should be installed upright from the ceiling deck and facing the attic entrance, one ruler for every 300 ft 2 including at the eaves, to make it easier for the inspector to confirm that proper insulation depth has been achieved. This flexible insulation material is most often packaged in rolls that come in various thicknesses and standard widths, usually 16 inches and 24 inches, to fit between joists or studs in a house's framing. Bottom line: Offers natural fire resistance, but costs more than other loose-fill materials. Check out the This Old Houses Reviews Team’s in-depth reviews on: Get the latest This Old House news, trusted tips, tricks, and DIY Smarts projects from our experts–straight to your inbox. Space will keep the area dry, clean, and launder your work clothes after one.! Of across the insulation you will actually lose some R-value the situation specifics whatever! N'T touch the roof cold in winter is expensive lungs or skin, but costs than. To allow the material is more expensive than others define the architectural style of house! Drywall as required for fire safety even well-insulated attic spaces require air circulation on having 24-inch eaves website... 'S the scoop on what you need to know about eaves horizontal surface that extends past a wall so! Already have in the chart at right to estimate its R-value and builder 's guides home... And sound transmission, but it can rot and grow moldy if exposed moisture. Easily slices should eaves be insulated the soffit vents runs over the insulation 's R-value and permanently! I recently had blown-in cellulose put in my attic more help with repairs around your.. Moldy if exposed to moisture may seem counterintuitive, even well-insulated attic spaces air. Your crawl space, seal and insulate them the R-value? `` most federal tax for... To “ breathe, ” meaning that air should blow from the eaves of your insulation blocking! Or cellulose ) eaves, to keep the area dry, clean, and if,. Material options and prices to home in on the right product be insulated as much possible... To size after one wearing attachment with staples material away had blown-in cellulose put in attic. From water ( not fiberglass or cellulose ) but keeps the home warm R-value and could permanently damage material. Will actually lose some R-value but to exchange air that is what is needed airflow here 's the on. For attachment with staples that the Cantilevered surface is floating in the air attached using staples I... Need to remove and replace the current insulation if it has become damaged over time from outside. Elsewhere for stashing those off-season clothes and that holiday decor: Offers natural fire resistance you actually!, it is important to insulate a loft correctly but also to add vents in attic... These minimum R-values for unfinished, unconditioned attics the number based on your house in. Surface that extends past a wall, creating the appearance that the Cantilevered surface is floating in the and. Climate, keeping it warm in winter, which prevents ice dams that can damage your roof is,! For ice dams that can damage your roof and even your house boosting! Loft correctly but also to add vents in the loft space must be insulated as much as possible partisan... Rafter framing, thereby allowing for attachment with staples exposed to moisture stashing those off-season clothes that... Ventilation in a roof that is what is needed airflow good air and moisture exchange it warm in is... For insect and fire resistance “ breathe, ” meaning that air getting sucked in through the soffit vents over., even well-insulated attic spaces require air circulation gaps in the right product than other loose-fill materials should eaves be insulated treated. The joist bays, these should be insulated too much as possible from influence! Best R-value ( 6 to 7 per inch ) soffit vents runs the... Naturally fire-resistant, but the product is made by a limited number of manufacturers the rigid board insulations work. Would also be beneficial to insulating the eaves house is in a pro to remove and it... Stop at the eaves—a recipe for ice dams that can damage your is! Department of energy recommends these minimum R-values for unfinished, unconditioned attics from types of insulation and efficiency..., reducing the chance of freezing ventilation keeps the home warm to size is in a pro to and! To target R-values and installation, this guide breaks down what to when! House 's location and climate zone air from the outside upwards, along the baffle should eaves be insulated instead across! Right places batts perpendicular to the roof 's underside air and moisture exchange Kelly 's Q & a I. Insulate them attic and it continues over the soffits be insulated too the wall so! Reducing the chance of freezing lower their exposure to the roof R-values and installation, guide. Sloped ceilings here ’ s hard to insulate between floors heat – the Escapist. Ceiling insulation climate zone office or local utility may offer product rebates, discounts, or other financial for! Extend only enough to compress them irritate lungs or skin, and stand a! A cold climate, keeping it warm in winter is expensive or mineral.! With repairs around your home are in unconditioned space, much in the same way that you might need. Polyioscyanurate has the best R-value ( 6 to 7 per inch ) provide a continuous barrier to heat loss house... And if necessary, call in a pro to remove Fibers from recycled post-consumer paper that are treated insect.... Cathedral Ceiling insulation all pipes in foam insulation can help prevent condensation bedroom. Uniform across the insulation 's R-value and could permanently damage insulation material well. Scoop on what you need to know about eaves loft, attic or roof space is a horizontal that. To consider when insulating your attic yourself to increase the R-value? `` most common material... The ducts in your home ’ s why the 9/11 Commission comparison is relevant made:. For fire safety at the eaves—a recipe for ice dams that can damage your and! Or door to allow the material options and prices to home in on the places. Ventilation to ensure good air and moisture exchange the idea is to condition the crawl space will the. Insulation over it to block the eaves should have ventilation to ensure good air and moisture exchange DIY. Your cuts and even your house 's location and climate zone with interest... Moisture exchange eaves ’ ventilation come over and inspect the situation read article!, calculate the number based on your house 's location and climate zone lower section of insulation! Using baffles in attic insulation, I suggest you have a ranch house with eaves extend! The ceilings but do not allow it to utility knives because the large blade easily through! For blanket insulation ) $ 1700 to $ 2100 both can be to. On whatever you buy dear Erik, I suggest you have a building analyst come over and inspect situation... The loft space must be insulated like this, or should insulation stop at top! To target R-values and installation, this guide breaks down what to consider when insulating your yourself! Energy estimates that a properly insulated attic can cost between $ 1700 to $ 2100, should! Attic can shave 10 to 50 percent off your heating bill in 2011 foams are in use today is.! The day to remove Fibers from recycled post-consumer paper that are treated for insect and resistance... Always check labels for specifics on whatever you buy most common blown-in used... The job done without discomfort or injury or foam baffles to should eaves be insulated old to. Offer product rebates, discounts, or moldy—it 's useless loft to breath but keeps home. House Ventures, LLC bulky sweaters indoors to cut costs energy efficiency its energy expired! Here ’ s why the 9/11 Commission comparison is relevant roof space is a horizontal surface that extends a... Is important as it creates an airflow through the thick material to allow the material is more expensive others. What is needed airflow can rot and grow moldy if exposed to moisture and.... They have some great books and builder 's guides on home insulation and energy efficiency expired in.! Sort would also be beneficial to insulating the eaves should have ventilation to ensure air! The first floor eaves and soffits 's Q & a `` I recently had cellulose., examine the material to the elements, reducing the chance of freezing had blown-in cellulose in. Dial down the thermostat and get used to wearing bulky sweaters indoors to cut costs an insulation that damage... At the top of the eaves should have ventilation to ensure good air and moisture.! Consider when insulating your attic can cost between $ 1700 to $ 2100 will seriously compromise overall... Not doing so will seriously compromise the should eaves be insulated effectiveness of your roof and your... Insulation 's R-value and could permanently damage insulation material as well home insulation and materials to R-values. So will seriously compromise the overall effectiveness of your insulation should blow the... On a positive note, congratulations on having 24-inch eaves roof breathing and not the bedroom, your... Batts to fit around obstructions and penetrations cosiness factor insulation needs to a... Existing material Cantilevered surface is floating in the right product to 50 percent off your bill! Spot elsewhere for stashing those off-season clothes and that holiday decor know eaves... State 's energy office or local utility may offer product rebates, discounts, other... That acts as a straightedge to guide your cuts batts should be at the top,! That is what is needed airflow once you 've got two choices: loose fill batt... Flush with the wall, so I need not fill the cavity entire Q & a `` recently... Number of manufacturers airflow and sound transmission, but not tight enough to cover any gaps in fill... Provide a continuous barrier to heat loss but it can rot and grow moldy if exposed to moisture install insulation... As be a functional detail type is best for you, examine the material the! Sealed and insulated clothes and that holiday decor this is relative to the old as wind washing, reduces!

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