Insulation Is NOT Always The Best Option

Roger explains why insulation isn’t always a good idea.

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The Downsides of Insulating Unheated Spaces: When Insulation Can Be Detrimental

Insulation is hailed as an essential component of modern building practices, designed to reduce energy costs, enhance comfort, and improve energy efficiency. However, there are scenarios where insulating can be detrimental, particularly in unheated spaces. In this article, we delve into the reasons why insulation might not be the best choice for some buildings, especially if they are designed to absorb heat.

1. Moisture Accumulation and Condensation:
One of the primary reasons insulation can be detrimental in unheated spaces is the risk of moisture accumulation. When insulation is applied, it often restricts air movement, which means any moist air trapped in the space has no way of escaping. This can lead to condensation, which over time may cause structural damage, mold growth, and degradation of building materials.

2. Interference with Natural Heat Absorption:
Some traditional buildings, especially in regions with significant temperature fluctuations, were designed to absorb heat during the day and release it at night, stabilizing indoor temperatures. Structures made of thermal mass materials like stone, brick, or adobe have this characteristic. Insulating these buildings interferes with their ability to absorb and release heat, leading to interior temperature imbalances.

3. Unintended Pests and Rodent Issues:
Insulation, especially certain types like fibreglass and cellulose, can become nesting grounds for pests and rodents if not correctly sealed. In unheated spaces, the chances of infestations might increase because of the lack of human presence and the comfortable environment the insulation provides.

4. Reduced Breathability:
Historic buildings often rely on the breathability of their materials to manage moisture and maintain their structural integrity. Modern insulation can reduce this breathability, trapping moisture inside and potentially leading to long-term damage, especially if the moisture can’t escape.

5. Unintended Thermal Bridging:
While insulation is designed to minimize heat transfer, it can create thermal bridges where heat escapes or enters more easily if not installed correctly. In unheated spaces, these bridges can undermine the overall performance of the insulation, rendering it counterproductive.

6. Financial Implications:
The cost of insulating an unheated space might not provide the anticipated energy savings, especially if the space remains unheated. This means homeowners or building managers might not recoup their investment.

7. Complications in Retrofitting:
For older buildings, especially historic ones, retrofitting with insulation can be complicated and risk damage to the original structures. The materials and techniques used in such buildings may not be compatible with modern insulation products.

While insulation has proven benefits in many situations, it’s crucial to consider each space’s specific needs and characteristics before proceeding with insulation. Unheated areas and buildings that leverage natural heat absorption mechanisms may not benefit from insulation. In some cases, insulation may even present risks. Always consult with an expert before making decisions about insulating any space.