Rigid foam board insulation is used throughout the home and is most commonly found in the basement walls and if you are a homeowner and believe in doing things on your own then this will be a close encounter with the rigid foam board. This leads many people to ask a question that says “how to install foam board insulation on interior walls?”.

The major method to correct all of this is to continuously run the sheets all across the walls. A firm base is required before installing the rigid foam in between the studs with the help of drywall screws and drywall.

It has many different areas and grades and each of them has its benefits, In the case of the wood frame walls, the intended use is to apply the insulation only to the outside on the framing and structural sheathing. Any insulation is better in the case of the board and it is important to ensure the insulation so as to avoid the coming up of problems in the later stage. The rigid foam insulation does not absorb water and it does not harbor mold of the air pockets and even though it has flaws insulation is a prerequisite.

How To Install Rigid Foam Insulation On Interior Walls?

When remodeling the older home, it sometimes is preferred that the interior walls are installed and there are two main ways in which the thermal bridging can be reduced. A double-stud wall can be built on a continuous layer of rigid insulation on the side of the wall. Many builders are used to installing rigid foam and some of the builders use semi-rigid panels they do it from the exterior side of the wall. The reasons behind doing so-

1. The exterior side has fewer interruptions like the electrical boxes or the intersection.

2. The exterior foam is a way to insulate the joints.

3. The rigid foam helps in keeping the wall dry.

Since the rigid foam board is a vapor retarder is belongs to the interior and the exterior foam is very risky and the researchers have identified this in the present day. The correct method of doing so is to run continuous 4 foot by 8-foot sheets all across the wall and making the foam the de facto wall. The thin furring strips are installed on the top of the foam to provide a base for the drywall. To cover the expansive walls the insulation comes in 4 foot by 8-foot size and large sheets come with shallow cuts to snap the sheets in half directly. The stud installation is not helped by the scores because of their width.

How To Hang foam board on wall?

The foam board decorations are a lightweight alternative in comparison to the plywood and the options include the clocks on the wall-mounted headboard of the board. The foam board also required no special type of wall as an anchor to hold large pieces of foam board.

Use Removable Tape

A double-sided tape is an option that can be used on a painted surface but removing the tape might peel away the tape. One can opt for a removable tape so that the positioning can be done without causing any harm to the wall and the paint. One may have to pay a little more than they pay for the duct tape and place the tape on each of the corners of the board and place them on the wall.


Use Hook And Loop

The hook and loop systems are considered a very secure way of hanging the foam core. Any dots or strips which come with a removable adhesive can be used. Put the hook and loop together to cling and remove the paper backing one by one to stick onto the board. After sticking the back pieces of the board the paper backing can be removed and the board can be placed as desired.

How Do You Install Foam Insulation On Interior Walls?

Insulation reduces the moisture and helps in regulating and maintaining the temperature along with cutting down the heating and cooling costs. The foam boards are one of the smartest choices for the same as they can be installed quickly and repel moisture and are inexpensive, durable, and available in the market readily. To install the foam insulation on the walls the steps that are to be followed are mentioned below-

1. Measure the length of the wall that is to be insulated and then cut the foam boards according to the size. The insulation can be placed both vertically and horizontally,

2. Apply the bead of construction adhesive to the studs that will cover the sheet. Press the sheet firmly in the desired place and hammer nails into the studs.

3. Apply insulation continuously using the same method till the entire wall is covered but make sure that the seams between the sheets are also covered using a house wrap tape.

Do You Need A Vapor Barrier With Foam Board Insulation?

The spray insulation foam is a vapor barrier in itself and it was traditionally applied to curb utility costs. It also helped in preventing the water movement from outside the house to reduce the energy costs. The vapor barriers used to cause more harm than good and moisture still could come in through air leaks or the gaps at the edges. If the edges and gaps are sealed properly one does not have to worry about vapor and the existing gaps can provoke the issue.

The reason why the use of vapor barriers has reduced in the present times is that they cause harm to the walls on which they are placed as the water gets trapped inside the wall and it is not possible to clean it off. If the temperature difference is high enough the barrier prevents moisture from escaping and this may cause damage to the wood and integrity of the walls. If the method of traditional insulation is still followed the moisture issue can convert into a mold problem.

Can Foam Insulation Be Installed In Existing Walls?

The foam insulation can be installed in existing walls ranging from half and 2 inches directly into the cavity with the help of three main materials:

1. Cellulose

As cellulose is made up of recycled newsprint and comes in a loose form it can be blown into the existing walls until densely packed. It is used often because it is an excellent thermal resistance and new cellulose can also be added retroactively and settles down over time. The holes are close to 2 inches in diameter and they can also help in resisting fire, pests, and molds.

2. Using Spray Foam

Injecting spray foam is also a method in which it is applied on the wall as a liquid and it expands in size very slowly. The slow rise helps it to fill even the smallest of holes and it can solve the problem of air leaks. To do a successful injection job one has to be prepared in advance. The holes of 1 inch or less can be filled properly with the help of spray foam.

3. The Attic

The walls are not the only part of the home that requires insulation. The attic should also be insulated as it has other benefits like overall comfort, efficient cooling and heating, and cutting down the utility costs.

How Thick Should Foam Board Insulation Be?

The foam board insulation is a great alternative to the common fiberglass batt insulation and has a higher R-value per inch in terms of thickness. It is also moisture-resistant and easy to work with. It comes in the standard 4*8 sheets size and some smaller sizes as well. The thickness of the board can range from ¼ inch to 2 inches and some types of thicker boards are also available if special orders are made for them.


The foam board insulation is a great way to add insulation and there are many different kinds of foam boards like Expanded Polystyrene (EPS), Extruded Polystyrene, Polyiso, and many others.

Is Foam Board A Good Insulator?

It provides good thermal resistance and reduces heat conduction through structural elements like steel studs, wood, and the conduction of heat is reduced by using insulation. It can help in keeping the home more comfortable if installed properly.


Foam board insulation is panels of insulation that are made up of different materials like polystyrene, polyurethane, polyisocyanurate and they can be used to insulate any cavity in the home from top to bottom. It can also be installed in the open cavities of the barn. It is offered in variable thicknesses, lengths and can also be customized according to the choice of the user. Some foam board brands have a white foil vapor barrier already attached to the board which prevents water from moving through it on either side and it also prevents the mold from forming.



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