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Reliable Closed Cell Foam Insulation for Homes and Commercial Spaces

Closed cell foam insulation offers strong thermal performance, moisture resistance, and added structural strength. We use trusted products like Enertite Foam to provide airtight, long-lasting results for homes and businesses.

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What is Closed Cell Foam Insulation?

Closed cell foam is a type of spray-applied insulation made from a dense polyurethane material.
When sprayed, it expands quickly to fill gaps, cracks, and cavities. As it cures, the foam hardens into a rigid structure that strengthens walls, roofs, and floors while forming a tight seal that blocks out air and moisture.

Unlike open cell foam, which is softer and more breathable, closed cell foam has a much higher density. This makes it ideal for areas that need maximum thermal resistance or are exposed to damp conditions.

Where Can Closed Cell Foam Be Used?

Closed cell foam insulation is suitable for both residential and commercial properties. It's a great fit for:

  • External walls
  • Roofs and attics
  • Crawl spaces and basements
  • Metal buildings and warehouses
  • Cold storage units
  • Commercial fit-outs

Because of its strength and moisture resistance, it’s especially useful in buildings where water exposure or structural reinforcement is a concern.

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Key Benefits of Closed Cell Foam Insulation

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Closed cell foam has a high R-value per inch, which means it offers better insulation with less material. It helps keep your indoor temperature stable, reducing the need for constant heating or cooling.
Once applied, closed cell foam creates a smooth barrier that reduces air leakage. This improves energy efficiency and indoor comfort by preventing draughts, hot spots, and cold areas.
Closed cell foam resists water absorption, making it ideal for spaces prone to dampness, such as basements, crawl spaces, or external walls. It also adds an extra layer of protection against mould and moisture damage.
Because of its rigid texture, closed cell foam adds strength and stability to walls and roofs. It can help reinforce buildings and increase resilience to wind and weather over time.
Closed cell spray foam doesn’t settle or lose shape, which means it lasts for decades without needing to be replaced. It’s a set-it-and-forget-it solution that adds value for years to come.
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How Closed Cell Foam Compares

We often get asked about the difference between open and closed cell spray foam. Here’s a quick comparison:

Feature

Open Cell Foam

Closed Cell Foam

Density
High
Low
R-Value (Thermal Efficiency)
Higher
Lower
Water Resistance
Excellent
Moderate
Air Barrier
Excellent
Good
Acoustic Performance
Moderate
Excellent
Cost
Higher
More Affordable
While both insulation types have their advantages, closed cell foam is often the better choice when performance, strength, and moisture resistance are key priorities.
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Premium Product: BASF WALLTITE®

Alpha Insulation uses WALLTITE®, a high-quality closed cell foam system developed by BASF. It’s trusted worldwide for its performance, reliability, and energy efficiency.
WALLTITE® meets industry standards for energy efficiency and safety.
Helps achieve or exceed airtightness targets in modern buildings.
Bonds well to most surfaces, including wood, concrete, brick, and metal.
Maintains performance for the life of the building.
Using premium materials and approved systems ensures your insulation performs at its best from day one.

Closed Cell Foam Installation Process

We take great care to make sure your closed cell foam insulation is installed properly. Here’s how it works:

1

Free Survey & Assessment

We visit your property to check insulation needs, spot any moisture issues, and recommend the right solution.

2

Preparation 

We prep the space, protect surrounding areas, and ensure everything is ready for a smooth and safe application.

3

Spray Foam Application

Our trained team applies the foam carefully to all required surfaces. It expands quickly to fill all cracks and gaps, creating a strong, sealed layer.

4

Final Inspection

We do a full check to make sure the insulation meets our standards for quality, coverage, and airtightness.

WHY US

Why Choose Alpha Insulation for Closed Cell Foam Insulation?

We care about doing the job right. From start to finish, you’ll get professional service, honest advice, and high-quality materials.
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Experienced Installers

Our team is fully trained and certified to install closed cell foam insulation safely and effectively.
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Trusted Products

We work with industry-leading brands like BASF to bring you tested, proven insulation systems.
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Personalised Solutions

Every property is different. We’ll recommend the insulation type and thickness that suits your specific needs.
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Eco-Friendly Approach

We help reduce your carbon footprint by improving your building’s efficiency with sustainable materials.
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Help with Grant Funding

We’ll guide you through available insulation grants and assist with the paperwork to make upgrades more affordable.
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FAQs

Frequently Asked Questions - Closed Cell Foam Insulation

Closed cell spray foam has excellent insulation and moisture resistance, but it comes with drawbacks. It’s more expensive than other options, rigid (so it may crack if the building moves), and can trap moisture if not properly installed. It also hides structural elements, making future inspections difficult, and is hard to remove once applied. In some cases, it may raise concerns with surveyors or mortgage lenders, especially in roof spaces.
Yes, closed cell spray foam is an excellent insulator. It has a high R-value, which means it provides superior thermal resistance compared to most other insulation types. Its dense structure also acts as an air and moisture barrier, helping to reduce heat loss, prevent drafts, and control condensation. This makes it especially effective in walls, roofs, basements, and floors, particularly in areas where space is limited or moisture is a concern.
Mortgage companies often dislike spray foam insulation, especially in roofs, because it can hide issues like timber rot or leaks, making surveys difficult. Poor installation can lead to moisture problems, and foam is hard to remove if repairs are needed. It may also reduce a property’s resale or remortgage value, causing lenders to see it as a risk—especially if there’s no clear evidence of professional, certified installation.

Improve Energy Efficiency with Closed Cell Foam

Closed cell foam insulation is a solid investment in your property’s comfort, energy efficiency, and long-term value. If you’re ready to improve performance and reduce heating costs, our team is here to help.
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