Is Spray Foam the Best Type of Insulation for Attics?

Spray foam insulation effectively reduces heat transfer through the attic structure,

Is Spray Foam the Best Type of Insulation for Attics?


When it comes to improving your home’s energy efficiency, the attic is a critical area to focus on. Proper insulation not only keeps your home comfortable year-round but also helps reduce energy bills. Among the various insulation options available, spray foam insulation often emerges as a top contender for attics. Let’s delve into what makes spray foam insulation so effective and why it might be the ideal choice for your attic.


Understanding Spray Foam Insulation


Spray foam insulation is a state-of-the-art insulation material applied as a liquid that expands into a foam. This expanding foam fills gaps, crevices, and irregular spaces, forming a seamless thermal barrier. It is renowned for its ability to provide superior insulation and air sealing compared to traditional insulation materials like fibreglass or cellulose.


Types of Spray Foam Insulation


Open Cell Spray Foam:

– Structure and Benefits: Open cell spray foam has a softer, more flexible structure. It expands significantly upon application, filling even the tiniest gaps and voids. This type of foam allows water vapour to pass through, making it suitable for applications where moisture control is necessary. Additionally, it offers some degree of soundproofing due to its structure.

– Usage in Attics: Open cell spray foam is commonly used in attics where a balance between insulation and air permeability is desired. It helps maintain a comfortable indoor temperature by reducing heat loss through the attic space.


Closed Cell Spray Foam:

– Structure and Benefits: Closed cell spray foam is denser and more rigid than open cell foam. It forms a solid barrier due to its tightly packed cell structure, providing excellent insulation and air sealing properties. This type of foam offers higher U-values per centimetre compared to open cell foam, indicating superior thermal efficiency.

– Usage in Attics: Closed cell spray foam is ideal for attics where moisture control and high insulation performance are priorities. It acts as an effective vapour barrier, preventing moisture buildup and potential damage from condensation. This type of insulation helps maintain stable indoor temperatures throughout the year.


 Advantages of Spray Foam Insulation in Attics


1. Superior Insulation Performance:

– Spray foam insulation effectively reduces heat transfer through the attic structure, contributing to significant energy savings.

– U-value: It helps achieve low U-values, which indicate high thermal efficiency, essential for reducing heating and cooling costs.


2. Air Sealing Properties:

– One of the key benefits of spray foam is its ability to seal air leaks effectively. It expands upon application, filling gaps and cracks that traditional insulation materials may miss.

– Effective air sealing enhances overall energy efficiency by minimizing air infiltration and heat loss, leading to a more comfortable indoor environment.


3. Moisture Management:

– Attics are prone to moisture intrusion, which can lead to mould growth and structural damage. Closed cell spray foam acts as a moisture barrier, preventing water vapour from penetrating into the attic space.

– By controlling moisture levels, spray foam insulation helps maintain a healthier indoor environment and prolongs the lifespan of your attic structure.


 Practical Benefits of Spray Foam in Attics


– Versatility: Spray foam insulation can be applied to various attic surfaces, including rafters, joists, and crawl spaces, providing comprehensive coverage and insulation.

– Longevity: Unlike traditional insulation materials that may sag or settle over time, spray foam insulation is durable and maintains its effectiveness for years.




Spray foam insulation offers numerous advantages for insulating attics, ranging from superior thermal performance and effective air sealing to moisture control and durability. Whether you opt for open cell or closed cell spray foam depends on your specific attic conditions and insulation requirements. Consulting with insulation professionals can help you determine the best solution tailored to your needs.


Contact Us


Considering spray foam insulation for your attic? Contact us today for expert advice and a free consultation.


We provide a fast response and are happy to discuss the services you require. Make an enquiry and call (087) 6323186 or fill in our contact form today. Trust us to bring our expertise and dedication to your insulation project

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