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At Sydney Insulation, we often get asked whether stacking insulation can boost its effectiveness. It’s a reasonable question—after all, if one layer of insulation is good, wouldn’t two be better? Unfortunately, the answer is no. Stacking insulation doesn’t improve R-value in the way you might think, and it can actually create more problems than it solves.
Here’s why stacking insulation isn’t the way to go and why it’s crucial to maintain a clean roof space.
What is R-Value, and Why Does it Matter?
R-value is a measure of thermal resistance. The higher the R-value, the better the insulation is at preventing heat transfer, keeping your home warmer in winter and cooler in summer. Earthwool batts, one of the most trusted insulation products on the market, are manufactured with specific R-values to meet the thermal performance needs of Australian homes.
While it might seem logical to think stacking batts on top of one another will double the R-value, it doesn’t work that way. Here’s why:
1. Compression Reduces Performance: Insulation works by trapping air within its fibres. When you stack or compress Earthwool batts, you reduce the air pockets, compromising their thermal performance. This leads to a lower overall R-value rather than an improvement.
2. Poor Air Circulation: Insulation needs to allow air to flow freely through the space between the fibres to function effectively. Stacked insulation can impede this airflow, further reducing its efficiency.
If your home already has insulation, you might think adding new batts on top of the old ones is a cost-effective solution. However, this approach often does more harm than good:
• Contaminated Roof Spaces: Old insulation may be contaminated with dust, debris, or even pests. Placing new Earthwool batts on top can trap this material, leading to reduced air quality and a diminished lifespan of the new insulation.
• Uneven Surface: Old insulation often becomes uneven over time. Stacking new batts on top can create gaps and inconsistencies, reducing the overall thermal performance of your roof space.
The Right Way to Install Earthwool Batts
For optimal results, we recommend:
1. Clearing the Roof Space: Remove any old or damaged insulation to ensure a clean, even surface for the new Earthwool batts. This eliminates the risk of contamination and ensures proper installation.
2. Installing Batts Correctly: Lay Earthwool batts in a single, even layer, ensuring there are no gaps or overlaps. Follow the manufacturer’s instructions to achieve the specified R-value.
3. Choosing the Right R-Value: Select Earthwool batts with the appropriate R-value for your home and climate. There’s no need to stack—just pick the right product for your needs.
Trust Sydney Insulation for Expert Advice
At Sydney Insulation, we specialise in providing high-quality Earthwool batts and professional installation services. Our team ensures your insulation is installed correctly for maximum performance, giving you a comfortable, energy-efficient home.
If you’re considering upgrading your insulation, skip the stacking and trust the experts. Contact Sydney Insulation today for advice and a no-obligation quote.
Remember, insulation is an investment in your home’s comfort and energy efficiency. Done right, it pays off in the long term. Let’s make sure your insulation is as effective as possible!