If you’re planning a home renovation, picking the right insulation can be tricky. Two popular options are fiberglass (Pink) and mineral wool (Roxul). Here’s an easy comparison to help you decide which one is best for your needs.
1. The Basics
Both fiberglass and mineral wool come in standard sizes (15 ¼ inches by 4 feet) and fit perfectly in 2×4 wall cavities. The key is not whether they fit but which one is better for your specific situation.
2. Cutting and Installing
Fiberglass Pink: Lightweight and easy to cut with a knife and straight edge.
Mineral Wool: A bit denser but also simple to cut using a serrated knife or small saw.
Both are easy to handle and install, even for beginners.
3. Water Resistance
Mineral Wool: Made from spun rock, it keeps its shape when wet and dries without losing effectiveness. Great for damp areas like basements, three-season rooms, or near outdoor faucets.
Fiberglass Pink: Absorbs water, which causes it to collapse and lose its insulating ability. This can lead to energy loss and even moisture problems in walls.
Winner: If there’s any chance of water exposure, mineral wool is the better choice.
4. Fire Safety
Both materials perform well under high heat and are resistant to burning. However, in a real house fire, drywall fails long before insulation matters. The focus should always be on safety and evacuation.
5. Cost and Coverage
Fiberglass Pink: Comes tightly packed, providing about 100 square feet per bundle.
Mineral Wool: Not compressed, so it only covers 60 square feet per bundle.
Since both cost about the same per bag, fiberglass Pink gives nearly double the coverage, making it more affordable overall.
6. Noise Reduction
Both have similar soundproofing ratings (STC). If reducing noise is a priority, either option works equally well.
Our Advice
Use mineral wool in areas with possible moisture, like basements, near plumbing, or in rooms exposed to the elements.
Go with fiberglass Pink for most of the house—it’s budget-friendly and works great for general use.
The Bottom Line
Both materials have strengths, but fiberglass Pink is the best choice for most projects due to its cost-effectiveness and versatility. For damp or high-moisture areas, mineral wool is worth the investment.
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