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Install Spray Foam Insulation In Existing Walls-Ecostarfoam

How to Install Spray Foam Insulation In Existing Walls

Are you looking to have a home or a well-insulated room? Do you know how to install spray foam insulation in existing walls?

Spray foam insulation is an effective method to insulate walls, but the procedure necessitates the use of specialized equipment and expertise, which can only be performed by a professional installation.

Can spray foam insulation be used in existing walls? It’s considerably more difficult to place spray foam in an existing finished wall, and when it can be done at all, it’s significantly more expensive than placing foam in fresh, unfinished construction.

What are spray foam products?

Spray foam insulation is a type of polymer compound that is sprayed in a liquid state. The chemicals are supplied through a spray applicator that initiates a chemical reaction by mixing two components at the nozzle.

The mixture quickly expands and hardens into a solid foam that fills the space after being sprayed into the cavities between wall studs. The expanding foam fills air holes in the hollow of the wall, effectively insulating it.

Spray Foam Insulation in Existing Walls Cost

The majority of the time, when someone insulates their existing walls, they also insulate all of the external walls to help seal up the building envelope.

Based on a variety of circumstances, the cost of completing all four outside walls can range from $4,000 to $8,000 for each exterior wall.

When it comes to the cost of the project, the greatest thing to consider is the size of the treated area that will be injected with foam insulation.

Because the work would require insulation over a larger area, it will be more expensive.

How to Insulate Walls Without Removing the Drywall

For insulating walls without having to remove the drywall, holes are made on the inside or exterior of the property. Wall cavities are insulated by blowing or spraying insulation materials between the studs of the wall structure.

This, along with attic insulation, contributes to the construction of a more energy-efficient home that consumes less natural gas or electricity to maintain a pleasant temperature.

What to expect before insulating walls without removing the drywall

When working on existing outside walls, there is no need to clean up before installing. Because the vibrations from the drilling might knock down any photos or knick-knacks, crews will ask the homeowner to remove them.

Homeowners are also encouraged to remove as much vegetation as possible from the area where employees will be working. Many landscaping components cannot be relocated, therefore an expert contractor will work around them.

Exterior Walls

By drilling holes into the siding of your house, you may add insulation to your walls without having to remove them. You may insulate the walls by blowing spray foam or cellulose into them from outside.

Simply drill a 1 inch to 2-inch hole between the studs at the top of the wall and then spray the insulation into the hole with a hose to complete the installation. Replace the cuts, fill the gaps with wood filler, sand smooth, and paint the siding to bring it back to its former glory.

Basement Walls

Insulating your basement walls will help you maintain a more consistent temperature throughout the year. Foamboard, spray foam, blown-in, and spray foam insulation can all be used to insulate basement walls.

Contractors utilize comparable procedures to retrofit external wall insulation installation for finished basements with sheetrock insulation. To install the insulation, holes are cut, then fixed, and painted over.


The easiest location to install insulation is in your attic, which is located beneath your roof. This is where increasing insulation will help the most.

Adding loose-fill insulation, such as fiberglass beads, cellulose, or rock wool, is another alternative. Bags of this sort of insulation may be purchased from a supply store.

You may add loose-fill insulation to your existing insulation in older homes. It is recommended that you add 7 to 12 inches of insulation to satisfy the requirements.

Insulation in your attic-Ecostarfoam

Batt or Roll

Roll or batt insulation composed of wool, fiberglass, or cotton is another choice for your attic. They’ll have comparable R values, but fiberglass is fairly ubiquitous and can be found at any hardware shop.

Fiberglass batts are comparable to those used in the building of your home’s walls. Rolls or batts can be installed between or over joists in the ceiling, being sure to cover any existing insulation.

Spray foam

Spray foam insulation is a more contemporary and popular form of insulation that may be installed without removing your walls. This substance is sprayed as a liquid that expands as it comes into contact with air.

It will seem fluffy and soft, yet it will have a high R-value. It will expand to cover any fractures, ensuring that there are no air gaps through which cold air may enter or hot air can escape. It’s usually sprayed between the rafters in the attic, and the extra material is cut using a saw or knife.

Closed-Wall Installation

Drilling tiny holes in the wall, either through the wallboard on the inside or through the outer sheathing on the outside, is a common method for placing spray foam within a completed wall.

The foam is then sprayed into the openings in the wall cavities by the installation. The foam materials utilized in closed-wall applications have a less aggressive expansion than other foams, making them less prone to harm the wall.

Closed-Wall Installation-Ecostarfoam

Benefits of Insulating Existing Walls

Lower energy costs, fewer drafts from outlets, and, in certain circumstances, a reduction in outside noise are some of the advantages of insulating or re-insulating your existing walls.

The extra comfort that an air seal offers to your house is wonderful since it lowers airflow into and out of those walls, but the money you save is a bonus. If you shield your entire home from the air movement, you may save even more money.

The chilly air traveling through the walls might add to the discomfort you’re experiencing in your house, but there’s often more to it than that.

Insulating your entire home with injection foam and spray foam may help you save money on your energy bills while also keeping you cool in the summer and warm in the winter.

You’ll benefit from wall insulation regardless of the type you use. The total energy efficiency of your home will increase, saving you money on electricity bills.

This is especially true when it comes to spray foam insulation. If you’re looking for spray foam wall insulation contact the experts at

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Is Spray Foam a Better Option than Fiberglass?

Star Spray Foam insulation is proud to provide affordable, efficient insulation services to the community of New Orleans. We have built a reputation in the NOLA area for efficient, high-quality insulation at an affordable cost.

We use quality materials to maximize the amount of heat retained inside your home – and we install them for you hassle-free.