Important considerations you should know about auto spray insulation

In the United States, many homes are insulated using spray polyurethane foam insulation. Auto spray foam insulation has been proven to have certain benefits over other types of insulation, including:

  • Rapid performance increase in insulating properties
  • Withstands temperature fluctuations better than any other type of insulation
  • Is not susceptible to shrinking or swelling like some gauze materials can be
    Auto spray foam has become a popular choice for homeowners and builders alike because it is quick and easy to install. However, there are several causes that may contribute to the failure of this installation process. One such cause is poor installation technique such as filling too slowly or not venting properly. The following is a list of some of the most commonly asked questions about auto spray insulation.
    What size should my fan be to vent my space properly?
    It is important to have enough air movement to eliminate the bubbles during the curing process. There should be at least 10 air changes per hour (ACH) in your space, but no more than 60 ACH in order to keep vapor pressure low enough for an optimal cure. The fan you purchase should be as large as you can afford. It will make it easier to control the amount of overspray as well as help with the evacuation of excess moisture and heat from the building structure during application. This will help ensure the correct air change rate mentioned above.

How much should I apply?

A professional can provide a good recommendation for the amount of foam to be used. Our commercial representatives will be able to provide you with a quote. We recommend that you have a professional spray the foam that is about 1 gallon per square foot (psf). The professionals in our network typically use 2-3 different guns for insulating multi-story buildings and homes.

Does Auto Spray Insulation have to stay in place forever?

As long as the installation work was performed correctly, then no, it does not have to stay in place forever. Depending on the product used, it may or may not have to be protected from exposure to direct sunlight. We recommend that you hire a contractor who is certified in the installation of this product.


I have heard that auto spray foam insulation is messy, how messy is it?


Auto spray foam insulation can be messy to install because of the overspray produced during application or cleanup. Applying and removing the product properly will minimize this mess. There will be clean up after using any type of insulation and auto spray foam is no exception. It’s not much more messy than installing fiberglass insulation, if done correctly.

How long does it take to install?

It is best to schedule an installation appointment when you order your material. Insulation that is sprayed on top of the wall can’t be painted because of its consistency. Spray foam insulation uses a liquid adhesive which cures in 2-3 days. The time it takes to install should be less than one day for an average sized building or home.
Can I spray more than one room at a time? No! It would be very difficult to spray all the rooms in your house at one time.

The average amount of foam to be used in a home is 2 gallons per 1,000 square feet. We have seen many different types of insulations being sprayed in homes. Insulation thickness can vary anywhere from 1/4 inch to several inches depending on the product that is being used. Professional spray insulation contractors will ensure that the entire building is insulated for best results and safety. If you are calling for a quote, ask your contractor how much insulation he/she will be using.

Can I install more than one layer?

It is very difficult, if not impossible, to install more than one layer of spray insulation from the same shot gun at one time. The second layer would not be complete. It would take an additional day to apply the second layer.

Do I need to wear a respirator?

Adults should be wearing respiratory protection at all times while performing spray foam insulation work. The amount of protection required will vary depending on three factors: your activity level, the amount of time you are in the area and the concentration of chemicals in the air. Typically, this is something that you should discuss with your employer or contact us for more information.

What is the best insulation for vehicles?

We recommend any of the products listed above. Insulation is not usually part of automotive insulation kits and most don’t come with spray adhesive. If you are installing the spray polyurethane foam as a protective barrier for your vehicle, you will need to add a layer of insulation after the spray polyurethane foam has cured. It would help to adjust the amount of spray foam placed on each side so that this occurs.

What is it made out of?

The material can be made from a variety of materials such as polyurethane, or another foaming agent, and it can be air-blown or extruded. Polyurethane is the most popular material for auto-spray insulation. Air-blown foam has an open cell structure and extruded foam has a closed cell structure. Open cell foams are usually more expensive, but closed cell foams can trap moisture. Auto-spray polyurethane foam itself is a single component, two part mixture that includes an isocyanate and a polyol resin.

What is the best material to use?

There are many different types of spray foam available for insulation application, such as open-cell spray polyurethane foam (SPF) and closed-cell spray polyurethane foam (SPF). Open-cell spray foam offers the ability to use less of the insulating material because air is able to move more freely within the spray foam. Closed-cell spray foam offers more stiffness and insulation per unit area because air cannot seep out of the material. The following are some questions you may have about auto spray insulation:

What type of auto-spray polyurethane insulation should I use?

We recommend any of the products listed above. Insulation is not usually part of automotive insulation kits and most don’t come with spray adhesive. If you are installing the spray polyurethane foam as a protective barrier for your vehicle, you will need to add a layer of insulation after the spray polyurethane foam has cured.

How much does spray foam insulation cost?

Spray foam insulation costs vary based on the amount of material needed, the quantity of material to be purchased and the type of spray foam being used. Spray foam insulation costs are typically lower when you compare them to commercial building insulation products. For example, spray polyurethane foam is typically less expensive than fiberglass batt insulation, while spray acoustical foam is less expensive than spray cellulose or mineral wool.

If I install spray foam insulation on my roof, how much will it cost?

When installing spray polyurethane foam on your roof, some of the extra expenses include: cutting back a layer of old shingles that are not in good condition and applying additional sealant to protect your roofing membrane before spraying. Because there is an additional cost for materials and time, we highly recommend you do it yourself or hire a professional that is well-versed in spray polyurethane foam application. Please contact us for a quote or comment on how much it would cost to do it yourself.

Can I spray insulation between studs or in exterior walls?

There are some instances where you can install spray foam insulation in an exterior wall but most people prefer to spray insulation on the inside of the insulation. If you plan to install spray foam in an exterior wall, we recommend that you contact your local municipalities to ensure it is legal. Spray polyurethane foams are not recommended for direct installation against structures such as concrete block foundations, masonry, etc.

Spray polyurethane foam is a great product for many applications. People commonly use it for roofing, wall coverings, attic insulation and many other projects in and around the home. If you are considering whether or not spray foam insulation is right for your project, we recommend that you check with your local building department to ensure that you can legally install spray polyurethane foam on your project and not to mention any other restrictions. We always recommend that you do a little bit of research before performing such a project on your own; especially if this is the first time you have attempted this type of task. Also remember that there are important details involved including safety precautions, proper preparation of the site as well as application of the material.