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Why Spray Foam Works Better Than Fibreglass in Humid Climates

Posted by Ecostar Insulation on June 03, 2025

Humid climates can be warm and comfortable to live in, however, many home materials do not perform well under moist conditions. Many varieties of insulation can become compromised when exposed to water or humid conditions. This can leave your home feeling drafty and inefficient in terms of energy consumption. So if you live in a humid area, standard fibreglass insulation won’t cut it. It is much wiser to invest in high-quality spray foam insulation in Toronto. If you are interested, reach out to EcoStar Insulation today for a quote on spray foam insulation costs

Here is a breakdown of why spray foam insulation is preferred over fibreglass for humid climates.

Understanding Humid Climates and Insulation Challenges

spray foam insulation torontoA humid climate is characterized by any area that experiences high levels of moisture in the air. These conditions are typical in tropical climates and/or regions/cities near large bodies of water. Given the fact that the primary purpose of insulation is to block out unwanted air and moisture from entering your home, it is inevitable for it to make contact with the moist air in humid climates. As a result, your insulation should be able to withstand the water.

Fibreglass Insulation’s Performance

Older insulation varieties, such as batt insulation or fibreglass, are not waterproof at all; when they come into contact with water or moist air, they lose their R-value, sag, and can grow mold. This is because fibreglass is a naturally absorbent material. 

Fibreglass also has a relatively low R-value, ranging from 2 to 3 on average. This means that it does not have the best capacity to prevent heat/air transfer between the outside of your home and the inside. This can lead to excessive heat in the summer and cold in the winter. This can result in your HVAC system working extra hard to maintain the desired temperature. 

Spray Foam Insulation’s Performance

In terms of performance, spray foam insulation takes the cake, especially when compared to fibreglass. Most varieties of spray foam insulation are water-resistant if not entirely waterproof. This makes it the perfect choice for humid climates as the material will not become compromised during humid summer weather. You also do not need to worry about mold growing inside the material.

In terms of R-value, spray foam insulation can go up to 7, making it excellent for preventing hot, humid air from entering your home in the summer, keeping you and your loved ones nice and cool. Its excellent heat resistance also contributes to an energy-efficient home. 

Switch to Spray Foam Insulation in Toronto, with EcoStar

If you live in a humid climate, it is vital that you invest in an insulation variety that is water-resistant or waterproof. Fibreglass insulation will not cut it in this scenario as it can sag, lose effectiveness and even grow mold when exposed to humidity. Instead, opt for top-quality spray foam insulation from EcoStar Insulation. It can withstand even the highest humidity levels without losing its effectiveness. Contact us today for a free quote on spray foam insulation costs. 

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