The Do’s and Don’ts of Using Expanding Foam Insulation Around the House

Spray foam insulation installation is one of the worthwhile costs most homeowners undertake. The installation helps improve their properties energy efficiency, reduces sound transfer, deters rodents, and protects against common moisture problems.

Spray foams can be a DIYer’s best buddy, but this is only true when the DIYer uses the product appropriately. Manufacturers also encourage the use of spray foams, and this is evident in the proliferation of packaged spray foams contained in pressurized cans with a straw attached. The attached straw makes it easy to apply the expanding spray foam into gaps, holes, and crevices.

While there are different types of spray foams on the market, homeowners and DIYers should stay clear of Icynene. Icynene is a spray foam meant for professional installation. This type of spray foam is perfect for whole-house insulations and often requires specialized equipment.

Buying the Icynene may be a waste of your money and time, especially as they have rapid expansion properties that require professional training for a calculated outcome. On the other hand, Great Stuff is a good option for DIYers looking to seal cracks and address holes around the house.

While you now know the products that may likely work great around the house, it is equally important to know the dos and don’ts of spray foam insulation. Find out everything you need to know below.

Do: Check the Expiration Date on the Product Before Use

Expiration dates are not only valid for food items. We recommend checking the can of spray foam insulation for its expiry date before purchasing.

Buying an expired product can put you at risk, especially as you risk ineffective insulation or exposure to toxic chemicals. While most stores will clean their shelves to remove expired products, you should also confirm that they haven’t skipped some.

If you already have a spray foam insulation can at home, ensure it hasn’t expired before use. If it has expired, dispose of the can into your household waste.

Don’t: Avoid Using Spray Foams Around Outlets and Recessed Can Lights

Homeowners tend to go overboard, especially on their mission to make their homes more energy efficient. The zeal to make your home draft-free shouldn’t overtake important safety and health considerations.

Avoid using spray foam insulations around electrical outlets or recessed can lights. This is because the spray foam can quickly spread around the wires and enter the outlet box. This can make it challenging to address common electrical or wiring issues in the future.

You could set yourself up for huge electrical costs if you apply expanding foam around your electrical outlets. If you must seal holes and cracks around outlets, we recommend using a small fiberglass batt insulation around those areas for easy access.

Do: Use Spray Foams to Silence Noisy Water Pipes

Noisy water pipes can affect the quality of your life and sleep. Your expanding spray foam can come in handy to silence the rattling plumbing work when applied correctly.

Using the long straw attached to your spray foam insulation can access the plumbing area causing the nose and spray some expanding foam around the affected pipe. Doing this will silence the pipe by blocking the sound and locking it in. This can also be a great solution for a water hammer. A water hammer is a problem that occurs when the valve on the pressurized water line closes due to built-up pipe pressure.

Don’ts: Avoid Applying Spray Foams Around Windows

Windows and window frames are common culprits for raft air and heat exchange. In a bid to make their homes more energy efficient, most homeowners may be pushed to apply spray foam insulations around the frames and windows.

This is often a bad idea, especially as the spray foam may solidify and make it harder to open your windows. If applied when the windows are open, you may find it hard to close the window.

If you must apply spray foam insulation around windows, we recommend using low-expansion foams instead of high-expansion foams. Low-expansion foams can expand up to 30 times, while high-expansion foams can expand up to 300 times the liquid size.

For the window area, apply the low-expansion spray foam insulation cautiously along the affected area. This can significantly block heat exchange while also keeping your window functional.

Do: Have a Spray Foam Solvent Close By

Spray foam insulation starts as a pressurized liquid, after which they expand and solidify upon application and exposure. Homeowners often use a saw or other sharp objects to remove excess spray foams from application surfaces. However, they can sometimes drip and stain other unwanted areas during application.

The appropriate cleaning solvent can significantly improve your application process and prevent a messy outlook.

Unsure of which solvent to purchase? Ask questions at your local convenience store and the staff are likely to recommend what works for them or other customers like you.

Don’t: Avoid Using Spray Foam Insulation Around an Open Flame or Spark

Spray foams are designed to impede the spread of fires after they’ve been applied. However, the pressurized and liquefied form contains highly explosive components that should not be exposed to spark or fire.

We recommend that users pay attention to the application surface to avoid the risk of explosion. You should also avoid using the product in closed spaces like crawl spaces and under the cabinet. If you must, ensure that those areas are well-aerated and well-lit to improve your overall safety and reduce gas accumulation.

Another safety tip is to avoid smoking during spray foam insulation application. If using pilot lights or candles, ensure they are turned off before the insulation spray foam is applied. Also, give enough time for the spray foam gas to dissipate before lighting a match or starting a fire of any kind.

Do: Use Personal Protective Equipment When Applying Spray Foam

Safety is an important consideration when applying spray foam, especially in tight spaces. You should have appropriate personal protective equipment and gear, including eye goggles, face or nose masks, respirators to prevent gas inhalation and respiratory problems, and more.

We also recommend wearing gloves and the appropriate protective clothing to protect your skin from irritation when in contact with the spray foam in its liquid form. Other safety considerations include long sleeve clothing and pants, disposable gloves, appropriate shoes, and a cleaning solvent at arm’s length.

Following the above guide can significantly improve your spray foam insulation experience and help reduce draft air in your indoor space. If unsure, contact a Houston spray foam professional contractor now!

Name, Address and Phone

First Defense Insulation 

12 Greenway Plaza Suite 1147 Houston Texas 77046



Blown-in Insulation vs. Spray Foam Insulation

Spray Foam Insulation vs. Blown-In Insulation

After suffering through the heat of summer, isn’t it time you decided to insulate your home correctly? It’s time to get rid of drafts. You can’t beat spray foam insulation for performance, versatility, and efficiency. And if you’re going to have it installed, you might as well get the best spray foam insulation Houston, TX, offers.

The high energy bills you pay monthly would be reduced by $100. Read on to learn the similarities and differences between spray foam and blown-in Insulation.

What’s Spray Foam Insulation

Spray foam insulation, also known as spray polyurethane foam (SPF), can be sprayed into wall cavities and other areas in a home. It’s a great option for sealing gaps and cracks in your walls, where it will expand to fill the entire space.

It’s also a very efficient form of Insulation since it provides excellent thermal resistance and helps to prevent condensation on cold surfaces.

Here is the process of applying spray foam insulation:

  • Choose the spray foam type. Many spray foam insulation available on the market today are open-cell and closed-cell. Each type has advantages and disadvantages, so matching your needs with the right product is important.
  • Clean the surface of the wall where you apply the spray foam. Use mild soap, water, or bleach to clean up any dirt or stains on the walls. Make sure that all surfaces are dry.
  • Cover windows and doors with plastic sheeting or cardboard before applying the spray foam insulation because they could get damaged by overspray.
  • Wear personal protective equipment (PPE) such as gloves, goggles, and a mask because it can be messy and potentially dangerous if you don’t take appropriate precautions.
  • Mark out each section that will be sprayed with masking tape so that you don’t waste material when spraying more than one area at a time. 
  • Spray the perimeter first because it is easier to coat large areas without wasting material or leaving gaps behind. Ensure to let the perimeter dry before spraying other areas.
  • Lube the applicator the moment you replace the spray tip.

What’s Blown-In Insulation?

Blown-in Insulation is a process that involves blowing Insulation into the spaces between studs and joists in your home using a hose. It not only creates an insulating blanket but also helps limit sound transfer from the outside and the inside, dampening the impact of things like street noise.

Blown-in Insulation is typically made from fiberglass or cellulose. It is installed using a blower machine to blow the material into place.

Before the sheetrock is installed, the studs and joists of a home’s walls and ceiling are insulated with thick, lengthy strips of fiberglass insulation. The Insulation can settle over time, leaving tiny holes through which air can flow, leading to heat loss. However, it is not always possible to re-install these sheets around obstacles like unfinished ceilings or other structural features.

Spray Foam Insulation vs. Blown-In Insulation: Difference?

Spray foam insulation and blown-in Insulation are excellent ways to keep your home warm and cool, but they have some differences.


Blown-in Insulation is less durable; it lasts 20-30 years because it’s made from raw fibers instead of a solid material like spray foam. Blown-in Insulation won’t last long if the cellulose is installed before sealing the air leaks; then, air will continue to leak through the space. 

The lifespan of spray foam insulation is 100 years. The longevity of blown-in Insulation varies based on how well it was installed and how much moisture it gets exposed to.


The price of  Insulation gets affected by the following factors:

  • Used Material 
  • Quantity of Required Resources
  • The amount of time to complete the task
  • Location of the Home 
  • Level of Insulation
  • Where Insulation is taking place

Spray foam costs more than blown-in Insulation. For example, while the average cost of spray foam insulation is $1.36-$2.63 per square foot, the average cost of blown-in Insulation is $1.00-$2.80 per square foot.

Ease of Application

Installing spray foam calls for unique tools and training. For example, in spray foam insulation, the chemical compounds are pressurized, which initiates the chemical reaction necessary to produce the foam. 

Blown-in requires professional assistance; blown-in Insulation is applied by a professional who uses an air compressor to blow the Insulation into your walls

Insulation Effectiveness

Spray foam insulation is sprayed onto the surface of your home with specialized equipment, where it hardens and forms a solid barrier. The result is an R-value of about 6.5-7 per inch (much higher than traditional fiberglass), which means it can keep your home warm and cool.

Blown-In Insulation, on the other hand, is applied through a machine that pressurizes a mixture of fibers and water into your walls and ceilings. It has an R-value of about 2.5-3.6 per inch, so it doesn’t keep your house as warm or cool as spray foam.

Air Quality

If the person applying the Insulation isn’t using the proper safety gear or the foam isn’t put properly, the reaction can be deadly. Specialists warn that the fumes and aerosols released during the application of spray polyurethane foam pose a risk to the respiratory system. Spray polyurethane foam contains isocyanates, a known irritant to the skin, eyes, and lungs.

Damp-blown-in insulation facilitates fungal growth. Fungal spores can be present in any attic, and when damp, they can grow and spread easily if the conditions are right. It can lead to health problems for those who inhale or ingest the fungus or mold spores. If your house’s HVAC system does not have a proper filter, it could circulate this harmful material.

Spray foam insulation has grown in popularity, but that doesn’t mean it’s the best option for everyone. It is a more efficient and effective method for insulating, however. Keep in mind that an increase in efficiency means an increase in costs. Spray Foam insulation is significantly more expensive than blown-in Insulation and needs to be carefully measured to ensure proper airflow. Visit for all your residential and commercial insulation needs.


Name, Address and Phone

First Defense Insulation, 

12 Greenway Plaza Suite 1147, 

Houston Texas 77046, 





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