Is It Appropriate To Apply Closed-Cell Foam On External Bathroom Walls?

Spray foam insulation is flammable and dangerous when left exposed, so it can be covered with drywall to reduce fire risk. It can also be used on the exterior portions of your home, such as basements and crawl spaces. Closed cell spray foam is an excellent insulation and moisture resistance option, but it should not be applied to damp crawl space walls.

Open-cell polyurethane spray foam is typically R-12.6 if 1-inch thick, while closed-cell polyurethane spray foam is usually R-6.5 if 1-inch thick. High density closed cell or low density open cell spray foam should not be used on the exterior of basement foundations. Closed cell foam insulation has a higher R-value, usually around 6.0 per inch, absorbing about twice as much heat as open-cell spray foam, making it very effective in areas with extreme temperatures.

Closed cell spray foam can be applied to both inside and outside of your home, sealing cracks and crevices for air barrier insulation. It can be applied to the inside or outside of your home, and it’s known for its effectiveness in areas with extreme moisture. However, it’s important to ensure that the studs are dry before applying the foam.

If you’re waterproofing your shower walls, you may create a “moisture sandwich” condition, which can be avoided by using Kerdi over the wall. The best solution is closed cell foam, which has the best R-value, doubles as an air barrier, and won’t retain water or moisture.

Injection foam insulation can be done from the outside without tearing down your drywall. Closed cell foam is the best option for wet environments and serves as its own moisture barrier. It can be installed below-grade in basements and crawl spaces, as well as above-grade in exterior walls.

What insulation is recommended for exterior walls?

The U. S. Department of Energy recommends that exterior walls in colder climates have R-values of R-13 to R-23, while in milder climates, a lower R-value may suffice. Consistency in R-values throughout the wall assembly is crucial. Building codes, energy codes, and local codes should be consulted for specific requirements. Updated Building Codes call for continuous insulation on both below and above grade exterior walls. Insulation materials, such as type, thickness, and design, are used to increase R-values. Common insulation materials include:

Where not to spray foam?

Spray foam insulation should not be applied directly to HVAC equipment or combustion appliances due to potential fire hazards. It is crucial to maintain a safe distance from these appliances and use appropriate insulation materials. Spray foam insulation can be used on exterior surfaces but requires proper protection against sunlight, moisture, and physical damage. UV exposure can cause degradation, while moisture can absorb water, compromising its effectiveness.

Proper exterior cladding or coatings are essential to shield spray foam insulation in these areas. Spray foam insulation is durable but can create challenges in areas with limited access for maintenance or repairs, such as plumbing or electrical junctions. To address this, alternative insulation options should be considered for easier access.

When should you not use spray foam insulation?

Foam insulation spray is suitable for unventilated attics, but it can restrict air flow and trap moisture. It should not be used inside HVAC ducts, as it can disrupt airflow and potentially damage ductwork. Spray foam should not be added to existing walls, as it requires drywall removal and may cause overfilling, leading to substantial damage. It should not be applied directly against electrical wiring or fixtures unless they are rated for contact with insulation. Closed cell spray foam is waterproof, while open cell foam is water-resistant, but it can pose an obstacle to repairing areas damaged by flooding or water intrusion.

Experienced professionals can advise against using foam insulation spray in these areas and recommend other insulation options. Contact a reliable spray foam insulation company, such as REenergizeCO, who uses home energy audits to evaluate a home’s overall energy efficiency. They can also advise on the best insulation option for your home.

Should you spray foam exterior walls?

Spray foam insulation is recommended for exterior walls as they provide high-performing insulation and a high R-value, making them comfortable and reducing energy costs. However, interior walls typically need less thermal insulation to prevent sound transfer. Spray foam can provide some sound attenuation but may not be the most cost-effective solution. Other materials like acoustic insulation may be more suitable for interior walls.

Installing spray foam in existing walls is more complex than in new construction, as it often requires removing interior drywall or siding to access the wall cavities, which can be invasive and unfeasible for many homeowners. Despite this, spray foam insulation can be a cost-effective solution for sound dampening in interior walls.

Does spray foam cause moisture problems?

Spray foam does not inherently cause moisture issues; however, excessive humidity can impede its effectiveness. To prevent the growth of mold, it is of the utmost importance to address and seal any moisture issues that may arise prior to the application of insulation.

Where not to use expanding foam?

Expansive foam should not be used near lightboxes, ceiling lights, or heating appliances as it can catch fire due to its flammable nature. It may also cause damage to the light itself if it cures around wiring. Some foams may claim to be usable in close contact with ceiling lights, but it is recommended to consult a professional for guidance.

Pre-existing conditions should not be used with expanding foam without a mask, as it contains isocyanates, a chemical that can cause serious breathing and skin-related issues. To avoid these risks, use breathable masks and protective eyewear. If you are at risk of serious side effects, find an alternative method of filling cavities.

When purchasing foam, choose the correct type, such as open and closed cell or high expansion and low expansion, as they behave differently. Open-cell foam is more effective and expands quicker than closed-cell foam, making it an alternative to installing new insulation.

Do I need a vapor barrier on exterior wall insulation?

Building codes mandate the use of vapor barriers with insulation to improve indoor environmental quality and energy efficiency. Building scientists recommend this method, as it protects against diffusion. Polyguard recommends a quality air barrier system to limit infiltration, exfiltration, and moisture accumulation in the building envelope. Contact Polyguard professionals for more information on when to use a vapor barrier with insulation.

What is the downfall of spray foam insulation?

Spray foam insulation, despite its popularity due to its quick installation process and affordable pricing, can occasionally contract over time, reducing its insulation capabilities. This issue is more common in areas with large temperature variations. To address this, more spray foam can be installed or a new application can be installed. Proper installation requires expertise, and the product dries rapidly during the installation process, particularly for open-cell versions. This issue is particularly affecting people who choose the open-cell version of spray foam insulation.

What are the negatives of spray foam?

Spray foam insulation, typically made of polyurethane, is known for being one of the most airtight types of insulation. However, it can lead to mold problems, foul odors, improper chemical mixing, termite damage, and being too airtight. It should not be considered an air barrier when pursuing energy-efficient homes like Passive House or Net Zero Energy Ready buildings. Spray foam can seal small gaps and tight areas of home framing, but it is not the safest insulative material.

The negatives to using spray foam insulation for homes might outweigh the positives, so it is best to consider alternative materials. Home builders should consider the pros and cons of each insulation type to ensure the safety and energy efficiency of their homes.

Do bathroom walls need a vapor barrier?

Vapor barriers are essential in areas with water or moisture, such as kitchens and bathrooms, to prevent condensation buildup, mold growth, and health issues. They are crucial during the building process to ensure a continuous barrier with no holes, gaps, or seams for moisture to enter. Materials used for vapor barriers include geomembrane or plastic liner behind drywall, semigloss paint on walls, and a vapor stop series.

The installation of vapor barriers should be considered on a regional basis, as cold northern climates differ from hot and humid south climates. A local building professional can help assess the needs of your specific climate before installation. Western Liner offers 12- and 15-mil reinforced polyethylene liners, including the Vapor Stop series, which is stronger than standard vapor barriers and more difficult to damage during installation.

Western Liner can heat seam the Vapor Stop together for less installation work in the field, and moisture-preventing tape is used to ensure proper impediment of vapor transmissions. By considering the specific needs of your climate, you can ensure the safety and security of your home or building.

Why not to use closed cell spray foam?

Closed-cell spray foam is an effective material for sealing and insulating, but its rigidity and the necessity for power tools can present challenges during the application process. Additionally, it can be utilized for attic insulation; however, it can also conceal roof leaks, thereby conferring a dual benefit to homeowners. It is imperative to take these factors into account when contemplating prospective alterations to the wiring or plumbing infrastructure.