Spray foam is an ideal choice for insulating the floor of the attic because it is air impermeable and a powerful insulator. This will keep conditioned air in the living area of the home, and the warm or cool air in the attic from entering the home where it can cause condensation, mold and other problems.
Pros of spray foam insulation
It can last for up to 80 years. It can help keep rodents and other pests out of your home. It can discourage bats too, but if you have an existing colony in your home you will need to get a specialist to remove it before using spray foam insulation.
Spray foam insulation is a good insulator in terms of keeping a room warm or cool. But its many downsides outweigh the benefits. These include, making it more difficult getting a mortgage, potential health issues, environmental damage, ventilation issues and a lower home valuation.
Spray foam insulation is one of those many factors that can throw up a red flag to a mortgage lender. For a lender, your insulation matters because it affects crucial metrics such as the home's saleable value and energy efficiency rating.
Project Size and Insulation Location
For example, using open-cell spray foam, the attic spray foam insulation cost is between $3,500 - $5,000, while closed-cell spray foam costs range from $4,500 to $7,000 for the same project size.
Directly against electrical wiring or fixtures: Spray foam insulation should not be applied directly against electrical wiring, fixtures, or recessed lighting unless they are rated for contact with insulation. Contact with insulation can cause overheating and pose a fire hazard.
Some Buyers May Be Uncertain Of Spray Foam Insulation.
If they don't know the contractor who installed it, they may worry that the foam was installed by people who didn't know what they were doing. Other buyers have heard negative stories about spray foam insulation.
The chemical aspect of spray foam makes it very hard for standard insurance companies to provide coverage. Most standard lines insurance carriers want to write the risks with no liability not spray foam contractors that manufacture plastic every day in the field.
Mold and mildew can begin growing behind the insulation which can go unnoticed until it's already become a huge problem. This often happens when the spray foam isn't installed correctly and space is left between the insulation and the wall, which allows moisture in and gives mold the perfect place to grow, unfettered.
While both types of insulation are great choices for home insulation, fiberglass insulation is generally considered to be safer than spray foam insulation. This is because spray foam contains a special type of chemical called isocyanate, which is toxic when inhaled.
While it is hugely useful, it should not be used to solve all problems. One such example is electrical boxes. Expanding foam shouldn't be used in these locations as it could cause jams that would be expensive to repair. So avoid using it around sockets or light fixtures, or any electrical components in the property.
Proper Attic Ventilation
Without ventilation, moisture can accumulate and cause mold, mildew, or damage to the roof. If spray foam is instead applied to the attic ceiling, ventilation may not be needed. An exception is with wood, tile, slate, or some asphalt shingle roofs that require an air gap for their warranties.
Why Fiberglass Batt Is the Best Attic Insulation Material. Fiberglass batt is considered to be the best insulation for attics.
To give you an idea, the average cost to spray foam an attic in an existing home typically ranges from $5,100 to $10,300.
Spray foam insulation provides an excellent air seal, reducing the workload on the HVAC system by minimizing air leaks. This not only extends the lifespan of the HVAC system but also improves comfort and energy efficiency, qualities that can boost a home's marketability and resale value.
Some mortgage firms are reluctant to deal with homes with spray foam insulation due to concerns over poor fitting leaving moisture trapped and roof timbers at risk of decay.
If the attic damage was caused by a covered risk, such as fire or wind, your home's insurance policy may pay the cost of rehabilitation. Repairing or replacing damaged insulation, drywall, and other materials could be included.
Closed cell spray foam has an R-value of R-7 per inch. In comparison, open cell spray foam has an R-value of R-3.8 per inch.
Spray foam insulation is a better insulator than traditional insulation. One of the most significant advantages of spray foam insulation is that it is a better insulator than other types, meaning homeowners can save money on their heating and cooling bills.
Instead of spray foam, Curtis recommends cotton denim insulation, which is typically made from industrial scraps.
Spray foam can provide the thermal, air, and vapor control layers in both new and retrofit construction. Unvented roof strategies with open cell and closed cell SPF insulation sprayed to the underside of roof sheathing have been used since the mid-1990s to provide durable and efficient building enclosures.