R-Value Wall Insulation - InsulationProTalk.com (2023)

For internal insulation you will need to use a rigid

Insulation Installation: R-Value in Walls, Attic, and Basement (Material and Labor Cost)

Synopsis:Former editor Martin Holladay outlines three ways to insulate a basement wall from the inside of the wall to achieve the minimumR valuesin space, with cut-out drawings to illustrate each montage. It outlines R-value requirements by climate zone, types of rigid foam insulation that work best indoors, and considerations for termites and airtightness.

Basement wall insulation can be placed on the outside of the wall, on the inside of the wall, or on both sides of the wall. When the basement wall is insulated from the interior, there are a few different ways to achieve minimum R-values. This article illustrates the three most common options: continuousrigid insulation, a combination of continuous rigid insulation andinsulating blankets, oclosed cell spray foam. Regardless of the insulation method you choose, here are some things to keep in mind.

What is isolation and how is it related to R?

Fundamental to understanding what the R-value means is understanding what insulation is and what it does. Ultimately, this is a question of why humans build shelters in the first place.


Insulation is a material that provides resistance to the flow of heat. The material prevents heat from passing through it, thereby trapping heat inside a home when it's cold or preventing heat from entering the home during the hottest summer months.

Almost every material used in building a home has some form of insulating properties, from wood to brick to stone. However, dedicated insulation materials are specifically designed with this goal in mind.

The most widely used insulating material in modern houses is fiberglass, usually in the form of blankets or rolls, and is usually placed in the attic of a house. This prevents heat from escaping through the roof of a house. our guide onfiberglass laminate and insulating blanketgo deeper into this specific type of insulation if you want to learn more.

The benefits of insulation are that it helps keep the house warm in the winter and cool in the summer. Because you don't lose heat in the colder months or get it back in the warmer months, you spend less on utilities and your home is easier to keep at a comfortable temperature.

For information on insulation costs, please visit our page ataverage cost of insulation.


Also check:What kind of insulation for the garage?

We make spray foam insulation

Spray foam creates an air barrier that acts as the first line of defense againstradonbut also other malignant gases. Additionally, the spray foam is a vapor barrier that protects the base. Protects a building from further damage that can occur over time. In itecoestrella,We are committed to helping our clients understand the how and why of their home renovations, so you can feel confident in choosing our services. We invest our time in protecting your home. To learn more about insulation and its benefits, keep reading our informative posts. Our services can meet the needs of your home improvement or insulation project.

Also read:24 inch wide rolls of insulation

What are the best R values ​​for different parts of a building?

As a guide, Matthew Jenkins atMyJobQuote.esrecommends the following R-values ​​for the following areas of a property:

  • External walls:Between R-13 and R-21.Insulation of exterior wallsIt can vary with older buildings having solid stone exterior walls that cannot contain any additional insulation unless added externally.
  • Lofts and penthouses:Between R-30 and R-39. When it comes toroof and attic insulation, it stands to reason that the highest levels of insulation are at the top of your building, where heat will rise and try to escape.
  • Basement walls:Between R-11 and R-15. Basements are often cold and damp, so insulation can combat the potential drop in temperature. However, heat loss is less significant at the lowest level of a house, so less insulation is needed.
  • Floors:Between R-13 and R-30. This will help retain heat and keep the cold underfoot.
  • ceilings:Between R-19 and R-38. Insulating your roof is vital to help maintain a stable indoor temperature within your home.

When in doubt, you should always consult the architect who designed your home. Alternatively, a skilled installer can take into account all the different factors to determine what insulation is appropriate for your home. visit theNational Insulation Associationfor a list of reputable installers and fabricators in your area.

Insulated Flooring Over Unheated Garages

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When insulating floors over unconditioned garages, firstvillageall possible sources of air leaks. This strategy has the added benefit of minimizing the danger of contaminants from the garage migrating into the conditioned space. Also install aair barrierto prevent cold air from the garage from "shorting out" the insulation under the subfloor.

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Inspection and evaluation of your insulation

Check the attic, walls, and floors adjacent to an unheated space, such as a garage or basement. Structural elements are often exposed in these areas, making it easy to see what type of insulation you have and measure its depth or thickness.

Inspect exterior walls using an electrical outlet:

  • Disconnect power from the outlet.
  • Remove the outlet cover and shine a flashlight into the space around the outlet box. You should be able to see if there is insulation in the wall and possibly how thick it is.
  • Strip a small amount of insulation, if necessary, to help determine insulation type.
  • Check the outlets on each floor, as well as the new and old parts of your home. Just because you find insulation in one wall doesn't mean it's in the whole house.
    • Inspect and measure the thickness of any insulation in ceilings and walls in unfinished basements or above crawl spaces. If the crawl space is not ventilated, there may be perimeter wall insulation. If your home is relatively new, you may have insulation outside of the basement or foundation walls. If so, the insulation in these spaces will not be visible. The original builder or owner can advise if external insulation was used.
    • Once you've determined the type of insulation you have in these areas and its thickness, consult the US Department of Energy's online insulation data sheet.determine the values ​​of Rpreviously installed insulation in your home.

    Insulation Type: Insulating Forms of Concrete Walls

    These are essentially poured concrete walls that can addup to insulation value R-20to the walls themselves. Basically, standard walls don't provide as much insulation. That's why these high thermal resistance concrete walls are used to maintain R-values ​​and reduce heating and cooling costs.

    In essence, these wall forms are made of various foam boards, placed inside the concrete wall forms. Connect these high R-value boards with plastic ties. There is a downside to using these shapes, but you can imagine that they don't have the same structural properties as standard cinder blocks.

    To increase structural properties, steel rods are added to these forms before concrete is poured over them. In such a way, we obtain:

    • High R value wallsthat reduce our heating and cooling costs.
    • strong wallsthat can sustain our house.

    Since the base of these wall forms are foam boards, made of polystyrene, polyiso or other insulating materials, there is a danger of high relative humidity and insects entering. To prevent this from happening, some forms of insulating concrete wall are pre-treated with insecticides.

    Insecticide treatment, along with waterproofing methods to prevent moisture ingress, are suitable measures to prevent wall forms from taking root from the inside out.

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    Sound insulation installation cost

    Sound insulation is a type of building material used for soundproofing.closed spaces. The soundproofing process creates a barrier between the interior and exterior space, reducing noise and unwanted reverberations. The increase in population and the configuration of tight communities have led to an increase in the demand for soundproof environments. The cost of installing soundproofing may discourage some potential buyers from investing in it.

    Soundproof paint is another option that can reduce noise. This water-based ink contains ceramic microspheres, fibers that absorb sound and heat, or tiny voids filled with pigment. Soundproof paint costs between $40 and $100 per square foot. Another option is to paint the existing interior walls. It may be a better option for homes with hollow cavities. But the cost of soundproofing paint is still quite high.

    Soundproofing can be expensive, ranging from $23,000 to $46,000 to soundproof an entire house. The cost depends on how many rooms need soundproofing, if you do it yourself, and how much noise you want to avoid. many newAre the condos soundproofedtactics included in your construction process. Builders can bend drywall in noisy areas and install sound insulation along with thermal insulation. Depending on the type of soundproofing you choose, the cost can range from $1 to $3 per square foot.

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    Insulation type: roller blanket and blanket insulation

    Wall insulation: what R-value should I install?

    Battery insulation is one of the most widely used types of insulation. Comes in pre-cut or cut-to-fill quilts or rolls without finishing:

    • Wall studs.Example: We use fire resistant blankets on the basement walls.
    • attic beamsor trusses.

    Basically, we are putting insulating blankets on our unfinished walls, floors, and even ceilings. Battery insulation is made of different materials, including:

    • Fiberglass.Fiberglass is the most widely used material for blankets because it is flexible, widely available, and has high R-values.
    • Cellulosewe are talking about insulation of cellulose blankets.
    • Natural fibers.
    • In limited cases, blankets can also be made from plastic alternatives to fiberglass.

    The R-value of fiberglass mats is very high. Are you looking anywhereR-2.9 to R-3.8 per inchof different types of insulating blankets. High-density batts with compressed fiberglass can achieve R-valuesas high as R-4.3.

    This means that standard sizes of insulation blankets have an extremely high overall R-value:

    • 2x4 inch wallscan hold bats withR-13the sameR-15values.
    • 2x6 inch wallscan hold bats withR-19oR-21values.

    We have insulating blanket with or without coating. The lining is basically a layer of aluminum foil that covers the blankets. These coatings can function as air barriers, radiant barriers, or vapor barriers.

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    Isolation and its role.

    We often see mention of R-values ​​when looking at the loft and the wallinsulation materialsor general construction materials to build walls and ceilings. It's one of several numbers that manufacturers publish, and while you might know that a higher R-value represents better insulating material, it's not that simple.

    The R-value is affected by the thickness of the material, while materials like mineral wool act differently than materials like plywood. However, most of the time, assuming all else is equal, a higher R-value represents higher thermal efficiency and better insulation properties.

    Types of fiberglass insulation.

    There are several types of fiberglass insulation to choose from when purchasing. Some are better for specific areas of your home, so knowing what type of fiberglass insulation you want to invest in is essential. For example, if you only want to replace or install attic insulation, it may be different than installing wall insulation.

    Manufacturers make fiberglass insulation by spinning very thin strands of glass into layers or small particles, depending on the type. This insulation has a useful life of around 50 years and is known to be inexpensive.

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    Best R-Value Insulation For Walls

    The R-value is a measure of a material's ability to resist the flow of heat. The higher the R value, the higher the insulating power. In the construction industry, the R-value is the measure used to determine the effectiveness of insulation. The R-value of insulation varies depending on the type of insulation, its thickness, and its density.

    Isolate the band beam

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    On the walls perpendicular to the first floor joists, cut short lengths ofunfaced batt insulationand press them between the joists and against the side joist. On walls parallel to the studs, press the face of the insulation with the kraft side facing the story above, holding it in place with wire insulation clips pressed between the studs. Faced insulation can be used only if it is covered with drywall.

    useful advice

    In very cold climates, insulating band joists with batt insulation can cause condensation to form on the band joist. Alternatively, carefully cut out the extrusion blocksPolystyrene foamagainst the band joist and seal withcaulkingaround the perimeter. This will prevent humid indoor air from seeping behind the insulation. Cover the insulation with drywall for fire protection.

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    Insulation Type: Sprayed

    Spray foam is one of the most useful types of insulation. It comes from small aerosol cans to large on-site foam machines. Basically, these spray foams consist of liquid foam that expands and fills voids in walls, ceilings, basements, attics, etc. It is incredibly versatile and can be used virtually anywhere during the construction phase and beyond.

    Smaller spray cans are especially useful when you need to do small DIY jobs that have a significant positive impact. These include:

    • Use spray foam around doors.The area around the doors conducts heat very well. That's why it has to be very well insulated.
    • Spray around windows.The windows are, in many cases, the part of the house where we use the most heat.
    • Insulate openings with spray foam.

    On larger jobs, spray foam can be blown onto large walls, onto attic surfaces, and on top of floors. If you want to insulate an attic or basement, foam-in-place insulation is the fastest and most efficient way to do it.

    If you've ever used spray foam, you know that it expands quickly and is easy to cut, trim, or even paint.

    There are two main types of foam-in-place insulation foam, namely:

  • Open cell spray foams.They are simple air-filled polyurethane foams. They are of lower density and have lower R values. A typical open cell spray foam will have an R-value ofR-3.7 per inch of thickness. Open cell spray is cheaper than closed cell spray.
  • What is R 13 insulation used for?

    R13 battery insulation is normally used forattenuate sound in interior wall cavities. It is similar to a large blanket, designed to fill a wall, floor, or ceiling with sound-absorbing material. In addition to providing sound attenuation, the blanket is also designed to reduce the amount of energy absorbed by the wall or floor.

    This is achieved by reducing the resistance of the insulating material to airflow. The blanket can be used in a variety of applications including, but not limited to, interior walls, floors, and ceilings.

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    Recommended reading:Spray on do-it-yourself foam insulation.

    Advantages of insulating interior walls

    The best way to answer the question of whether it is necessary to insulate interior walls is by listing the advantages of the process.

    First of all,internal insulationoffers soundproofing advantages. Adding insulation will reduce noise and sound transfer from one room to another. Sound also travels through the wood structure, so the insulation will not provide a complete sound barrier. However, the noise will be greatly reduced.

    Internal insulation also provides energy savings. If you have rooms that are not used year-round, interior insulation will save you a lot on utility bills. Some rooms suitable for indoor insulation include unused rooms, storage rooms, and three-season rooms.

    Insulation inside will reduce heat transfer that occurs due to unused rooms. So, if you have unused rooms, then the answer to the question of whether you need to insulate the interior walls is yes. In areas with extreme temperature fluctuations, simply closing off unused rooms won't help.

    The interior insulation of the walls is mandatory when there are dividing walls. They are walls that separate individual spaces found in apartments and duplexes. you definitely needreduce sound and heat transfer.

    Imagine if no one lives in the apartment that is connected to you by party walls. Since this apartment has no heating, it will steal all the heat from your apartment.

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    Assembly #: One Continuous Layer of Interior Rigid Insulation

    Understanding Insulation and R-Value | ask this old house

    If you are insulating an interior basement wall, one of the best approaches is to use a continuous layer of rigid foam.

    An easy way to insulate the inside of a basement wall is with a continuous layer of rigid foam thick enough to meet the minimum R-value for your climate zone. This approach is shown in the illustration at the top of this page. If you can't achieve your target R-value with one layer of rigid foam, it's perfectly acceptable to install two layers of rigid foam.

    Rigid foam can be adhered to concrete with foam-compatible adhesive or attached with special fasteners such asHilti IDP fastenersoRodenhouse Plasti-Grip Fasteners PMF.

    Once the rigid foam is installed, you can either install a 2x4 stud wall to the inside of the rigid foam, or you can install 16-inch 1x4 strips down the center for easy drywall installation. If you are framing a 2x4 wall, be sure to install the fire block on top of the wall. For more information, seeSeven common fire lockout locations.

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    What is the recommended R-value for wall insulation? ›

    Depending on where you live and the part of your home you're insulating (walls, crawlspace, attic, etc.), you'll need a different R-Value. Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.

    What is the maximum R-value for a 2x4 wall? ›

    Fiberglass and rock wool batts—2x4 walls can hold R-13 or R-15 batts; 2x6 walls can have R-19 or R-21 products.

    How can I tell the R-value of my insulation? ›

    To determine the current R-Value of your home's insulation, simply measure the amount of fiberglass insulation in your attic (overall thickness) and multiply it by 3. For example, if you have 10 inches of fiberglass insulation, your R-Value is 30.

    What is the R-value of 1/2 inch drywall? ›

    Drywall has a relatively low R-value — about 0.45 at ½” thickness. This is similar to building materials such as siding, concrete, dirt, face brick, particleboard, wood and single-pane glass.

    Does doubling the insulation increase the R-value? ›


    The thermal barrier of a home should consist of a continuous layer of insulation on all sides—including the lowest floor, the exterior walls, and the ceiling or roof. Doubling the thickness of insulation will double the insulation's R-value, cutting heat loss in half.

    Does drywall count for R-value? ›

    All building materials offer some degree of R-value, or heat flow resistance, but some are better than others. Drywall, for instance, has an R-value of about R-0.5 for its half-inch thickness. This is minimal when you consider that filling a 4-inch-thick wall cavity with insulation increases the R-value to about R-15.

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