Insulating interior walls can also be very beneficial for minimizing the amount of sound transferring between rooms. Although not a complete sound barrier, insulation offers a medium through which sound is dampened, and this can be very useful in apartments, shared housing, between houses on “party walls”, and in rooms with specialist features such as cinema rooms, recording studios and more. Additionally, some people insulate their bathroom walls to decrease the sounds from travelling from bathrooms to bedrooms and more.
Installing insulation in your walls during the process of building or renovating a house enhances the energy efficiency of the building, which saves money on heating and cooling. Insulation also helps to buffer sound so whether you want to utilize spray or fiberglass insulation batting, the proper steps and techniques are simple for the DIYer to learn, so you can do the job correctly.
One of the most common reasons for insulating interior walls stems from the increasing focus on energy efficiency and the environment. Insulating walls minimizes the amount of heat loss, which inevitably reduces the amount of energy utilized, therefore lowering your energy bills. Insulating interior walls can be especially useful in homes where there are unused rooms, guest rooms or storage rooms – the insulation will minimize the amount of heat transfer into such rooms that don’t require heating or cooling, reducing both heat and air conditioning costs.
Here are our top 10 choices for the best insulation for your walls:
A Closer Look: Best Insulation for Interior Walls Under $100
1. Wall Stickers 20pcsWall Stickers Home-Decor-Products
This product comes in a pack of 20 sheets, covers 118 square feet, size of each tile: around 2.59ft x 2.28ft (79cm x 69.5cm) and the material is foam cotton.
It has 3D colorful decorative soft foam brick wall panels, elegant, security, eco-friendly, noise insulation, anti-collision, safety and effectively prevent children from injuring while playing.
It can be pasted to any smooth wall, installation, casual collage, arbitrarily cut, and can be easily cleaned and maintained. It can be applied to featured walls, kitchen, bedroom, living room, dining room, TV walls, sofa background, office wall decoration, etc. Don't apply in shower or on rugged wall surface.
2. Dicor Coolcoat Rubber Ceramic Coating
The new CoolCoat Insulating Coating utilizes advanced MicroCells technology to minimize heat transfer from the RV roof to the RV interior. Tests show that this new ceramic coating can decrease the interior temperature by as much as 29 percent from the roof temperature. The temperature reducing coating material is a new alternative to the popular acrylic coating that RVers have utilized for years in Dicor's Two-Part Coating System for EPDM (ethylene propylene diene monomer) roofs.
Dicor Products says it is essential to prepare the roof with the cleaner/activator before applying either coating (second part) to ensure maximum coating adhesion. CoolCoat consists of MicroCells, which are nano-sized spheres, inside of which a vacuum has been created, which helps to dramatically slow heat flux. In this case, the heat transfer is from the RV's exterior roofing surface to the RV's interior surfaces, from where the heat can emit into the RV. Using such vacuum-filled spheres is almost equivalent to the way a Thermos works in keeping liquids hot and cold for an extended period of time.
When CoolCoat cures, the MicroCells become condense packed and help create a tough coating that reflects and dissipates heat by reducing heat flux. This enables everything under the roof to stay cooler, longer, thereby minimizing the load on air conditioning and saving energy. Like Dicor's EPDM Roof Acrylic Coating, CoolCoat extends the life and beauty of rubber roof membranes in creating a protective barrier with superior resistance to harsh weather and ultraviolet light. Shipping could be delayed or postponed in the case of extreme weather/temperatures to ensure product quality.
3. ThermaCels - Insulating Paint Additive 1 Gallon Package
HY-TECH ceramic insulating paint additive is a fine, white powder blend of high strength ceramic "microspheres" and each single ceramic microsphere is so tiny that it looks to the naked eye as if it is a single grain of flour, (slightly thicker than a human hair).
When mixed into paint the painted surface dries to a condense packed layer of the hard, hollow "microspheres", (Hy-Tech's exclusive CVM, ceramic vacuum matrix technology.) The tightly packed film reflects and dissipates heat by reducing the path for the transfer of heat. The ceramics are able to reflect, refract and block heat radiation (loss or gain) and dissipate heat rapidly prohibiting heat transfer through the coating with as much as 90% of solar infrared rays and 85% of ultra violet-rays being radiated back into the atmosphere.
Hy-Tech insulating additive is completely inactive and can be mixed into ANY paint, coating or composite including interior house paint, exterior house paint, roof paint, solvent base coating, epoxy, urethane, high temperature paint, elastomeric, mastics etc.
The addition of the ceramics to any material offers improved fire resistance, protection of coated surfaces from harmful UV rays, repulsion of chewing insects and increased durability of the coating due to the hard ceramic finish. Ceramic filled paint is more effortless to clean and lasts far longer than conventional paint pigments.
4. 3M Thinsulate Acoustic/Thermal Insulation SM600L
3M SM600L sound thermal insulation engineered for vehicles, doors and walls. 60" wide, scrim on one side and 1 linear foot is 5 square feet. Material comes compressed from 3M but the material will expand to 1 3/4 or 44mm. Thinsulate is also FMVSS 302 certified.
Provides more acoustic absorption per unit weight vs. other competitive products. Helps customers acquire mass reduction goals Non-woven sound absorbing fibers create a quieter environment with hydrophobic fibers.
Recommend using 3M 90 Adhesive Spray to apply the white fiber side and approximate amounts needed to insulate the walls, ceiling, doors and walls. Sprinter 144 WB = 50 linear feet, Ford Transit 148 WB = 50 linear feet, Promaster 159 WB = 50 linear feet, 170 WB Sprinter = 60 linear feet, 170 WB Extended Sprinter = 70 linear feet.
5. Expanded Polystyrene, EPS Foam Sheets
Expanded Polystyrene (EPS) foam insulation panels are utilized for all types of home, art, craft and construction projects. EPS has a 35 year history of proven performance as firm foam insulation. EPS foam supplies optimum cost value when compared to other rigid foam insulations of the same R-value design.
EPS foam insulation products are also available in a range of densities necessary to offer both structural integrity and cost effectiveness. It has 1 lb density Expanded Polystyrene foam, oversized packages, low actual weight, but UPS calculates dimensional weight of approximately 30-35 lbs. These items are contingent on special shipping considerations due to size and weight. An estimated $50 shipping cost per box. Expanded Polystyrene (EPS) foam insulation is utilized in homes, art, packaging & construction.
6. Premium Heat Reflective Insulation Roll
Miloo has designed a heavy-duty thermal insulation that reflects heat radiation while creating a powerful barrier from the outer element. This high quality reflective insulation will save money and conserve energy while creating an effective sound barrier in hundreds of applications.
Can be utilized for the following applications:
7. Reach Barrier SS24100 Air Single Reflective Polyethylene Insulation Roll
Reach Barrier SS24100 Single Reflective Air Insulation offers a single layer of sealed air laminated between two layers of durable polyethylene (one reflective, one white/non reflective). This gives Single Reflective Air the ability to retain its air longer and supply excellent insulation and sound reduction.
Single Reflective Air meets ASTM standards and conforms to Building Code. The insulation roll is effortless to install because there is no mess or fumes and will not cause itchy skin. Reach Barrier’s Single Reflective Air Insulation is perfect for: attic spaces, exterior and interior walls, interior masonry walls, radiant floors, metal and steel buildings, knee walls, crawl spaces, garage ceilings and many other applications where insulation is required.
This particular insulation roll is 100-feet long, 24-inches high and 3/16-inch nominal. Reach Barrier’s reflective insulation products are one of the most versatile and energy efficient insulation products available on the market. Radiant (reflective) barriers are installed in attics, walls, roof decking, as well as flooring. Most newly constructed homes contain radiant barrier insulation because of the proven effectiveness to reduce energy usage and cost by reducing summer heat gain and winter heat loss.
Installing a radiant barrier might be the lowest-cost improvement that can produce the greatest overall reduction in energy usage as well as expenses.
8. Owens Corning 703 Fiberglass Boards
These boards look simply stunning. But more importantly, they perform incredible. If you place these strategically to get rid of early reflection points, you will be surprised at the results you can attain. Everything just sounds so much cleaner and the ringing and flutter has been greatly if not entirely reduced. Topped with the black fabric, the panels look amazing and blend in to a room very well.
Turns out you can have both aesthetics and performance but beware these fiberglass boards will attenuate all waveforms so be warned. Regarding the performance of the fiberglass, bear in mind that 703 has a Noise Reduction Coefficient (NRC) of close to 1 starting from around 300Hz and up. These boards will function perfect upwards of about 250Hz; however bass trapping is another story.
While you could layer these up, if you require bass trapping, Owens 705 does a much better job. You can look up the figures online but these panels do an excellent job of absorbing unwanted echoes, and yielding a clear, concise sound.
However, proceed with caution: These panels are designed with fiberglass. Uncovered fiberglass is exceedingly messy. There is a warning label in the box explaining the protective gear that should be worn like gloves, respirator, and eye protection. You definitely don't want tiny little glass splinters in your hands that you cannot see but can definitely feel. You should not be considering these unless you are comfortable with the idea of doing it yourself.
9. Reflectix ST16025 Staple Tab Insulation Roll
The staple tab edge is manufactured by puncturing the bubbles 3/4" down each edge of the product. This creates a foldable tab which enables easier stapling for installation in wall, ceiling, and floor systems and inhibits or eliminates condensation.
It is nontoxic and no carcinogenic and does not require protective clothing, goggles, or a respirator to install. It is perfect for basement walls, crawl spaces, or attic and has r-16.8 value for crawl space applications and R-6.13 value for basement walls. It’s completely resistant to mold, mildew, and fungi. This product is excellent for use with livestock and/or produce, Class A/class 1 Fire rated and 5/16" Thick.
It has a seven layer, reflective insulation which is available in rolls of various widths and lengths. It is utilized extensively in both specialty and standard construction projects. Two outer layers of aluminum foil reflect 97-Percent of radiant heat and each layer of foil is attached to a tough layer of polyethylene for strength. Two inner layers of insulating bubbles withstand conductive heat flow, while a center layer of polyethylene provides Reflectix with high reliability and strength.
10. Reflective Insulation Shield, Heat Shield, Thermal Insulation Shield
This is not cheap double bubble reflective insulation material, but supreme quality reflective foam insulation, commercial grade with 10 years warranty. You can insulate in attics, ceilings, walls, steel buildings, pole barns, roofing, concrete floor, radiant heat in a concrete floor, radiant heating under a wood floor, cathedral ceiling, water heater tank, radon barrier, water pipe and air duct, reflective ceiling system, behind a hot water radiator, crawl space, in ground swimming pools, shed, fish & hunting shelter, cooling room, cold chamber or wine cellar, concrete block wall, cavity wall for metallic studs in commercial buildings, foundation wall, above ground swimming pools, quanset hut, house wrap.
Extremely effective and reflect 97% of radiant energy, and has a perfect radiant barrier. Unaffected by humidity and moisture, mold resistant, can be utilized outdoor as well as indoor. It is an excellent soundproofing material. It also has 3mm closed cell polyethylene FOAM (not bubbles) Effortless to install, easy to cut and easy to clean, extremely strong but lightweight.
How to Insulate an Existing Wall?
To insulate an existing wall, you are looking at 3 main options:
How Can You Check Your Current Wall Insulation?
Before you start improving your wall insulation, you have to figure out what kind, if any, you already have. To do this, select a wall near an unheated space such as a garage or basement. Proceed to turn off your power and remove an electric outlet cover on one of these walls. Making use of a flashlight, take a look into the wall through the cracks around the outlet box.
Even though this is a rather tiny space, you should be able to see insulation if there is any. Try to pull a small piece out so you can determine what type and thickness it is. Remember, just because you have insulation in the first wall you check does not necessarily mean that all walls in the house are insulated, so it’s essential to check multiple walls.
Whichever method you select, the insulation needs to be put in place with the greatest care. If the insulation is applied poorly it may cause mould problems or 'thermal bridges’, i.e. points where the insulation barrier is interrupted.
Why Insulate Interior Walls?
When you add more insulation to an interior wall it has the following benefits:
How Is New Insulation Added to Existing Walls?
There are various options for insulating interior walls that are already in place. The most common insulation selection for this type of job is spray foam insulation in Petaluma, CA. The foam is forced into difficult spaces, such as around wires and boxes. Other insulation types usually tend to get stuck around any obstructions. An insulation specialist will merely create a small hole in the wall and spray in the new foam insulation before patching and painting the entry point. The whole process is effortless and requires very little disruption to the wall. Another option is blown insulation because this is more cost effective than spray foam insulation, but it can settle in hollow spaces and cling to any obstructions within the wall.
Before You Begin Applying Insulation, Be Sure to Seek out the Best Solution
When you live in an apartment, it is easier to insulate an existing wall from the inside than from the outside. Nonetheless, stay on your guard as insulation from the inside may have disagreeable consequences if handled incorrectly.
There are a number of considerations that need to be taken into account before deciding to insulate the internal wall. These include:
Which Rooms Should You Work on First?
Insulating interior walls not only can minimize heat flow from room to room, but it also can provide some level of soundproofing. If you have any loud rooms in your home such as a movie theater, you might want to insulate these areas first to avoid disturbing the rest of the house.
You should also insulate interior walls of rooms that you do not utilize all the time, such as a guest room or storage area. Heating or cooling these areas can be very costly, so wall insulation will help decrease energy costs.
Ideally, all exterior walls should be insulated to effectively minimize the flow of heat in and out of the home. Insulating exterior walls should always be a top priority over insulating the interior of the home.
This one change will make a significant difference in your comfort level within your home. During the winter, you’ll be able to notice that there is less of a difference in temperature between the rooms, and there are no cold drafts running through the house. In the summer, you might notice that you don’t need to crank the thermostat down as far to keep cool. Wall insulation is an investment that certainly pays off!
Avoid Inseeping Moisture
The bond between the wall and the insulating material needs to be impeccable and the wall needs to be completely sealed and waterproof. It also needs to withstand rising damp and torrential rain. Get a professional to ensure your home complies with applicable requirements before you start working.
How Much Should You Expect to Pay?
More than anything, the price to insulate an existing wall depends on the technique adopted and the materials you have selected. Typically, external wall insulation costs twice as much as interior wall insulation.
Blanket and Batt Insulation
By far the most common type of insulation consists of a "blanket" of rolls or batts of insulation utilized to fill the cavities between framing members in walls, ceilings, and floors. Batts can also be laid in a blanket across attic floors to insulate the spaces below.
Batts and rolls contain flexible fibers woven together in strips of varying widths and thicknesses for different applications. Most commonly, batt insulation utilizes fiberglass fibers, but it can also be manufactured using mineral fibers, plastic fibers, or natural fibers such as wool or cotton.
Blanket insulation can provide R-values ranging from R-11 (for 3.5-inch-thick batts) to 38 (for 12-inch-thick batts). Batt insulation is one of the most affordable forms of insulation, and one of the easiest to install.
Injection Foam Insulation
Foam has some advantages over fiberglass insulation, chiefly because it withstands mold and mildew better than loose fill, batt, or roll fiberglass. Unlike blown-in cellulose, its strong expansion properties mean that it can force its way into complicated areas, such as around wires, boxes, protruding nails and screws, and other spaces that tend to hang up gravity-fed cellulose.
Foam injection insulation is like those individual cans of foam insulation you can purchase at a home center but on a much larger and far more efficient scale. Professional injection foam installation is best, but several manufacturers supply moderately expensive do-it-yourself kits. Foam insulation is probably the best retrofit selection in terms of avoiding wall damage.
Remove Drywall and Install Roll Fiberglass
In an ideal world, you would be able to unscrew invisible bolts, remove drywall panels, install insulation, and reinstall the panels. Our less-than-perfect world of permanently attached wallboard means time-consuming hacking away of gypsum, individually removing drywall screws or nails, installing R-13 or greater fiberglass roll insulation, and then re-installing the drywall. It's a mess and not to mention, highly costly. Still, for all of the pain and effort involved, the remove-and-reinstall method is quite simple, straightforward, and can provide you with the best assurance that all vacancies in your walls are being filled.
Liquid foam insulation contains cementations or polyurethane materials that are sprayed, injected, or poured into walls or under floors, where it then hardens into a perfect insulating material. It is excellent for irregularly shaped areas and around obstructions, or it can be utilized to add insulation over existing finished areas. It is a great option for insulating existing walls, as it can be injected into them without removing the wall surfaces.
Liquid foam may enable you to achieve higher R-values than with traditional batt insulation, and it has the advantage of being able to fill the tiniest holes to minimize air gaps around pipes, door and window frames, and plumbing and electrical lines.
Spray foam is available in many different forms. It can be applied professionally to large areas by contractors using specialized machines or applied to small air gaps utilizing simple spray cans available at home improvement centers.
Radiant Barriers and Reflective Insulation
While most insulations work by withstanding conductive and convective heat flow, reflective insulation works by actually reflecting back radiant heat.
These insulations incorporate a radiant material—typically shiny aluminum foil—applied to a layer of traditional insulation that also has some form of backing—kraft paper, plastic film, or cardboard. It is most commonly used in attics to decrease summer heat gain and to lower cooling costs. It is one of the best types of insulation for prohibiting downward heat flow.
Reflective insulation forms a radiant barrier that reduces heat transfer from roofs down into an attic space. It must face an air space in order to be truly effective. They are most effective in hot climates, where they can significantly lower cooling costs by 5 to 10 percent. However, in cooler climates, traditional thermal insulation is a better selection.
It’s Important to Understand the Basics of Heat Transfer
You need to know a house loses and gains heat, so you can properly evaluate whether your home is a good candidate for a radiant barrier. The most essential basic fact to know is that the rate at which heat flows from a hot area to a cold one is a function of the temperature difference between the two spaces.
Conduction is the heat flow through a solid object or several objects touching one another. This is basically how the handle on an iron skillet gets hot on the stove. The walls and ceiling of a house also lose or gain heat in this particular way, because the building materials are all nailed together.
Convection is basically where heat flows through a moving fluid or gas. This usually increases the rate of heat flow compared to plain conduction through a solid. An example is how your skin loses heat faster during winter on a windy day, provoking a wind chill factor that in effect creates a lower temperature.
Radiation is heat flowing directly from one object to another through a vacuum, air or glass and it’s not dependent on touching or fluid flow. This is how the sun heats the Earth or you feel warm sitting in front of an intense fire.
Radiant Energy Is Unique
What makes radiant energy particularly unique in this discussion is that it’s much more affected by a temperature difference than the other types of heat flow. For conduction and convection, if the temperature difference between indoors and outdoors doubles, then the heat flow also doubles. With radiation, the heat flow is 16 times greater when the temperature difference doubles.
This is why a radiant barrier is most often utilized in the attic to block heat flow through the roof. On a hot summer afternoon, the temperature of a dark shingled roof can simply reach 150 degrees. This hot roof conducts heat to the roof sheathing and from there; conduction takes over the radiant heat and transfers it down through the insulation, to your ceiling and into your house.
A radiant barrier needs an air gap to prohibit it from touching the hot surface; otherwise, it becomes a conductor like any other building material. Reinforced aluminum foil was originally was utilized as a radiant barrier, but now many barriers use plastic films with reflective surfaces.
In addition to reflectivity, emittance is a property of radiant barriers and it should be lower than 0.25 – 25 percent – in order to be an effective barrier. Aluminum foil is well below the 0.25 level and there are also reflective paints, such as Low/Mit (www.solec.org) that can be sprayed underneath the roof sheathing. You should definitely check the emittance spec before signing any contract for installation of a radiant barrier.
If you want to get the best payback from energy savings, it makes sense to install the radiant barrier yourself. Invest in a hand construction stapler, a utility knife and a long straightedge and you’re prepped and ready to install the material.
The easiest method when it comes to installing a radiant barrier is to cut it into lengths and staple it underneath the roof rafters. It’s really not important how neatly and carefully it’s installed, but having adequate attic ventilation is critical – preferably a combination of soffit and ridge vents. When installing single-sided foil, it is recommended that you face the reflective side down to take advantage of its low emittance.
Loose-Fill Blown-In Insulation
How would you feel about having a paper product insulating your walls? With boric acid added for fire resistance, shredded, recycled telephone books, tax forms, and newspapers all helping to make safe cellulose insulation, blown-in cellulose is injected into the wall cavities by a series of holes drilled into either the inside or outside of the walls. Blowing-in attic cellulose is considered a do-it-yourself job. But wall cavities are more complicated, so do-it-yourself installation is not recommended.
Blow-In-Blanket Wall Insulation
Blow-In-Blanket (or BIBs) is the brand name for a patented new-construction method of insulating walls with blower-injected fiberglass pellets that can be utilized for either open or closed walls. On open walls, a fabric sheath is attached to studs, offering a type of cage that contains blown-in fiberglass (not cellulose) pellets. Unlike loose fill insulation, these pellets form a tight, dense, seamless blanket that is extremely effective when stopping air infiltration.
Different Insulation Techniques
Insulation from the Outside:
Insulation from the Inside:
This type of insulation can be put in place only if the cavity is completely clear and hollow. To ensure this is the case, get a professional to take a look.
You Can Use This Process for Fitting Internal Wall Insulation Yourself:
For our final recommendation, our favorite was the Reach Barrier SS24100 Air Single Reflective Polyethylene Insulation Roll, 2-Feet by 100-Feet because this product has two layers of durable polyethylene which gives it the ability to retain its air longer and supply excellent insulation and sound reduction. It is easy to install and will not give itchy skin and also great for any type of applications where insulation is required.
The most common reason for utilizing these products is saving energy, saving money and comfort control. A properly insulated home costs less to heat and cool because it uses less energy to obtain comfort. For the environmentally conscious person, it can be an essential factor when insulating home. You are able to minimize the amount of energy you use while cutting down on the fossil fuels required to produce that energy. Thus decreasing your impact on climate change and global warming.
Different types of insulation can also help decrease flame spread in case of a fire. Moreover, fire retardant insulation can safeguard your home from fire damage to a certain degree. In addition, a well insulated home is more comfortable as the ambient temperature continues to be more stable. Adding insulation and improving the energy affiance in your home will have an enormous effect on indoor comfort.
A perfectly insulated home will also demand a higher resale value over a house that is not properly insulated. This may become crucial at a point where you want to refinance or sell your house.
We hope you found this article helpful, and if so, we are glad we could be of assistance.