While spray foam roofing has been praised for its benefits, 2024 has highlighted significant drawbacks that homeowners should consider. Issues such as high upfront costs, health concerns, installation problems, and environmental impact need careful evaluation before choosing this insulation type.
Potential problems with spray foam insulation
reduce air circulation and ventilation within a roof space. lead to dampness and condensation on the underside of a roof because it forms an air barrier and stops moisture from escaping. place timber-framed roofs at risk of decay.
While spray foam insulation can make a home more energy efficient, its downsides often out-weight its benefits. If spray foam insulation isn't installed correctly or is used in the wrong setting, it can cause all sorts of problems, from reducing ventilation to rotting wooden roof beams.
Some experts have said that when spray foam is installed improperly, it can reduce air circulation and ventilation within the roof space, resulting in dampness and condensation forming on the roof's underside, as it creates an air barrier that prevents moisture from escaping.
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.
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.
Due to its quick and straightforward installation process and affordable pricing, spray foam insulation is quickly becoming a popular product. However, there is a chance that the insulation in this product will start to shrink over time, which will lessen its insulating capabilities.
Fiberglass batt is considered to be the best insulation for attics. Compared to other insulation materials, it is the cheapest and easiest to install.
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.
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.
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.
The best alternative to spray foam insulation is Multifoil Insulation. The reason being is that it incorporates the 'good' of the traditional insulation, whilst not having any of the drawbacks that spray foam insulation possesses.
The cost to insulate an attic is usually between $1.50 and $3.50 per square foot. This price can change depending on the attic's size and how easy it is to get to. For a typical 1,500-square-foot attic, you pay $2,250 to $5,250.
Spray Foam Roof Insulation Saves Time and Energy
While installing a spray foam roofing system costs more money than other solutions, you can expect to regain your money over time because of its efficient heating and cooling properties.
Closed-cell spray foam, with an R-value of R-6 to R-7 per inch, is especially effective. Though it's more expensive and requires professional installation, it resists moisture, mold, and pests, enhancing the building's structural integrity and energy efficiency.
Both types of spray foam insulation can last anywhere from 80 years to 100 years, with closed cell spray foam having a slight edge in terms of durability. For most families, this represents the lifetime of the house and then some!
Conditioned attics with spray foam applied to the roof deck create a sealed environment that aligns the attic's temperature and humidity with the living spaces below. These attics typically don't require traditional ventilation systems like ridge or soffit vents.
Open cell foam's ability to absorb moisture may contribute to water-intrusion damage in spaces below ground level or in the roof, if the roof covering is not fully water tight.
If closed cell spray foam has been used rather than open cell spray foam insulation, the main problems are that it can put stress on supporting roof timbers, can restrict air circulation in the roof and cause condensation, which in turn causes roof timbers to rot.
'Cowboy traders' Now, homeowners with spray-foam insulation are "struggling to sell" or remortgage because a quarter of major lenders are "reluctant to deal with" houses with this kind of insulation. They have "concerns over poor fitting" trapping in moisture and leaving "roof timbers at risk of decay", said the BBC.
Each shingle manufacturer sets its own policy. Some may void the warranty if spray foam insulation is used, while others may permit it under certain conditions. For example, Atlas Roofing explicitly states in their warranty that applying spray foam insulation to the roof deck voids their shingles' warranty.