Introduction
Insulating exterior walls is key to enhancing energy efficiency and reducing heating and cooling costs. There are several types of insulation to consider, each with unique features suited to different homes. Here are some top insulation choices for exterior walls.
1. Spray Foam Insulation: Maximum Efficiency
Spray foam insulation, particularly closed-cell foam, is favored for its superior insulation (high R-value) and air-sealing ability. It’s sprayed directly onto walls, creating an effective barrier against drafts and moisture.
- Benefits: Ideal for energy efficiency and moisture control.
- Drawbacks: Higher upfront cost and requires professional installation.
2. Rigid Foam Board: Durable and Effective
Rigid foam board insulation is a durable, high-performance option that includes three main types: expanded polystyrene (EPS), extruded polystyrene (XPS), and polyisocyanurate. These boards offer different R-values, with Polyiso being the highest.
- Benefits: High R-value per inch, great for moisture-prone areas.
- Drawbacks: More challenging to install in older homes with existing wall structures.
3. Fiberglass Batts: Budget-Friendly and Versatile
Fiberglass insulation is available as batts or rolls, making it easy to install between wall studs. While more budget-friendly, fiberglass batts are less effective at sealing air leaks.
- Benefits: Cost-effective and widely available.
- Drawbacks: Not as effective for extreme climates; can trap moisture if not installed correctly.
4. Mineral Wool: Fire-Resistant and Sustainable
Mineral wool is popular for its fire-resistant properties and soundproofing benefits. It’s an excellent option for homes in noisy urban areas and has a higher density than fiberglass.
- Benefits: Fire-resistant, soundproofing capabilities, eco-friendly.
- Drawbacks: Higher cost than fiberglass.
5. Blown-In Cellulose: Eco-Friendly Insulation
Blown-in cellulose insulation is made from recycled paper, making it a green option. It’s suitable for filling cavities in both new and existing walls.
- Benefits: Environmentally friendly, good for reducing air leaks.
- Drawbacks: Settling over time can reduce effectiveness.
Conclusion
Choosing the right insulation depends on your budget, climate, and long-term energy goals. Each type has advantages and drawbacks, so carefully consider which insulation type will best suit your home’s exterior walls.