Below is a calculator to help you determine the amount of bags you need for coverage. It's better to overfill them to a depth of 13 to 14 inches for southern climates (R-38) and 16 to 18 inches for northern climates (R-49). Open cavity application (attic) Nominal bag weight 28.5 lbs. Your home’s age—If your home is more than 10 year old, you likely need more insulation. 1. If your attic insulation is blown in 12" to 14" puts you at an R30. Batts use an R30 at about a 10 to 11" thickness. They was exactly what I wanted. The trick is to get the material to produce a sheet of insulation with an R value of R – 30 or more for the lowest possible price. … You will need a higher R-value of insulation if you live in the Northeast than if you live in Southern California. If yours is an older home, you’re probably already somewhat aware of the lower R-value insulation found in older houses like yours. Along with knowing the R-value of a particular insulation, it is also important to calculate the R-value of a total system. So I'd like to have "the appropriate amount" of closed cell spray foam applied to … Click the button to calculate the depth (in inches) and pounds of total insulation required for this job. In comparison, an inch of blown fiberglass insulation has an R-value of 3.1 - 3.4 and an inch of blown cellulose in an attic has an R-value of 3.2 - 3.7. Inches of Insulation Uninsulated Floor Uninsulated Wood-Frame Wall Insulated Wood-Frame Wall 1 R30 to R49 R25 to R30 R13 * 2 R30 to R60 R25 to R38 R13 to R19 N/A 3 R30 to R60 R25 to R38 R19 to R25 * and add R5 insulative wall sheathing beneath the new siding 4 R38 to R60 R38 R25 to R30 A standard mid-performance roll of fiberglass blanket insulation measures up to R-3.8 per inch. Please enter in your email address in the following format: you@domain.com Enter Email Address GO It was 9.5 inches thick. Input length, width and desired R-value of the area to be insulated. I have about 6 inches of blown-in insulation in my attic. Cellulose will settle after installation, creating a dense continuous layer, helping to block air transfer through any holes into your attic. Blown fiberglass installed in the attic has an R-value of 2.2 per inch, so 12 inches of it would give you an R-value of 26.4 in your attic installation project. Input length, width and desired R-value of the area to be insulated. only 2 inches: “Insulstar Spray Foam Insulation is a spray-applied, semi-rigid, cellular polyurethane foam plastic insulation having a maximum thickness of 2 inches and a nominal density of 2.0 pcf.” Insulstar has an R-value of 5.77 per inch, so the maximum thickness of 2 inches yields an R-value of about 11.5. In temperate coastal areas such as Zone 3, attic insulation of at least R30 up to a maximum of R60 is recommended. R30 R38 (C**) R38 Insulation Thickness 1.75" 2.5" 3.5" 3.5" 3.5" 6.25" 5.5" 6.5" 8" 8.5" 10" 10" 12" * All listed thicknesses are approximate and may vary by +/- 0.5 inches. In temperate coastal areas such as Zone 3, attic insulation of at least R30 up to a maximum of R60 is recommended. How many bags of cellulose and/or fiberglass do you need for a given job? The same insulation will hold more heat the thicker it is installed. This calculator is to be used as an estimating tool ONLY. The thickness of your R-38 insulation will depend on the material you have, the brand, and how it's installed. Valor de resistincia termica (valor R) Maximuma 75° MinimumF de temperatura media. Blown-In Insulation Calculator. Minimum Weight in Lbs./Sq. Knowing this, then we can mathematically deduce and assume that 6 inches of Styrofoam has an R value of about R – 30. If the joists are 10 inches deep, the cavity can take high-density R-30 insulation, which is 8 1/2 inches thick, more than enough for floor insulation. R-Value at 75° F Mean Temperature. Understanding R-Values. The cellulose product Home Comfort Insulation uses is treated with 100% Borate Fire Retardant Formula. Pieces Per Bag. Fiberglass Insulation. Three inches of closed cell spray foam insulation certainly will not give you R30 insulation. I'm planning on R40-45 in the walls (double stud) and R60-65 in the ceiling (parallel chord trusses). Get $5 off when you sign up for emails with savings and tips. Rigid foam insulation typically gives the best insulation in the smallest thickness, measuring up to R-6.5 per inch. If you’re looking to re-insulate your home, you’ve probably stumbled upon spray foam insulation as an option. For example, if you have a type of insulation that has an R-value of R-5 per inch of thickness, you will need a depth of 6-inches of this insulation installed in your attic to reach R-30 … To meet R-19 in a floor, you would need about 3 or 3.5 inches of closed-cell spray foam. There are many ways to retrofit a home with fiberglass and mineral wool insulation. Likewise, 9 1/2 inches of regular batt insulation will provide an R-value of approximately 30. Ft. Enter your data into the fields where indicated: square feet of house (or area to be insulated,) current and desired R-value for insulation and type and cost of your energy. For instance, if you have fiberglass insulation in your attic 12 inches deep, the insulation has an R-value of 30. The standard calculation given by manufacturers for blown insulation is the number of bags per 1,000 square feet required to achieve a desired R-value. How Thick Does Spray Foam Insulation Need to Be? R-30 unfaced insulation, easy ceiling, attic and floor install ... R30. Even in the case of cathedral ceilings, notoriously difficult to insulate, 2 by 12 rafters will allow sufficient space for ventilation, plus 10-inch batts of insulation, with at least R-30 value. An R-38 fiberglass batt should be approximately 12 inches thick, while the thickness of cellulose insulation of a finished, fitted product will larger. Minimum Thickness (Inches) Expesor minimo (en pulgadas) Net Coverage (no … All of that said, I don't know what code, if any, applies to your region in North Carolina. In many states, rural towns have no building codes at all. When the temperature is 30 degrees, I have frost on my roof. It is pulverized into a fine powder that adheres and remains a part of the insulation. Click the button to calculate the depth (in inches) and pounds of total insulation required for this job. Nominal bag weight 28.5 lbs. For loose-fill cellulose, this translates to a total depth ranging from 8 inches up to 16 inches . The fiberglass comes in rolls, also known as batts, which vary in size. Many older homes do not have the space available for R30 plus insulation. Blowing loose fill is a good way to fortify insulation in the attic. That tells me my insulation is adequate. Insulation professionals will be able to tell you how much insulation you need, based on: What region you live in … – Les Oct 24 '12 at 14:10 Insulation Type. I am leaning towards insulation of pink fiberglass with a R-38 rating. ** The "C" denotes high-density materials specifically designed for installation in areas where space is limited, such as cathedral ceilings. Eight inches of poor quality insulation may have a higher and better R-Value than one inch of top-quality insulation. I'm building a home in northern Wisconsin on the southern edge of zone 7. As a benchmark, one inch of solid wood has an R-value of 1. Number of Bags. R25 to R30 R25 to R30 Zone 1 includes Hawaii, Guam, Puerto Rico, and the Virgin Islands Uninsulated Attic R30 to R49 R30 to R60 R30 to R60 R38 to R60 R49 to R60 Existing 3-4 Inches of Insulation R25 to R30 R25 to R38 R25 to R38 R38 R38 to R49 Wall Insulation: Whenever exterior siding is removed on an UNINSULATED wood-frame wall: I had planned on using dense pack cellulose but there are lots of valleys and no good way to ventilate them. Thus more insulation would have a very long payback time. Recommended levels of insulation is essential that this insulation be installed properly. with insulation without insulation with insulation without insulation; Wood Frame 2 x 4 (3½"– 4" Batt), 16" O.C. Application Coverage Chart 19.05 lbs (8.64 kg) INS541LD. It now has roughly 3 to 4 inches of blown cellouse insulation. they can and do have room for thermal reflective barrier. /bg) = 30 bags Dense Pack Sidewalls: R-13, 2” x 4” […] *Average coverage charts: [per 1,000 sq.ft.] Ft. So, you need to know an insulation product’s thickness as well as its R-Value in order to compare it to another product. Just so, how many inches of insulation is r30? Minimum Bags Per 1,000 Sq. Since the "experts" think I should have at least twice this amount of insulation, what am I missing? To meet R-20 in a wall, you would need about 3 or 3.5 inches of closed-cell spray foam. The thickness would be 12″ and a width of 16″. To arrive at R-38, you need at least 15.2 inches of blown-in fiberglass insulation, requiring you to add 3.2 more inches of insulation if you already have 12. If the garage is open to the rafters, the boards that support the roof, use R-38 insulation between the rafters at the roof, if they are 10 inches … Maximum Coverage Per Bag in Sq. For loose-fill cellulose, this translates to a total depth ranging from 8 inches up to 16 inches. Now generically speaking, we usually recommend open cell spray foam to be 6- to 10-inches on a roof deck or ceiling and 3-inches in the walls. Ft. http://www.HowToHomeInsulation.com - If you've ever wondered what R-value really means for you and your home...watch this brief video. Site-applied closed cell foam insulation is generally going to be around R6 per inch - so you would have a cavity insulation value of about R18. Use this insulation savings calculator to measure the financial impact of increasing your insulation performance. This calculator is to be used as an estimating tool ONLY. Cellulose: Loose Fill Attics: R-30, 9.5” deep, (30lb. The thickness of spray foam really depends on where it’s being applied and what you’re trying to accomplish. THIS IS GREENFIBER® BLOW-IN CELLULOSE INSULATION DO NOT ADD WATER TO THIS PRODUCT. Will depend on the Southern edge of Zone 7 double stud ) and pounds total. Has roughly 3 to 4 inches of closed-cell spray foam really depends on it. 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