7. Installing Insulation and Soundproofing
Types of Insulation
Choosing the right insulation improves thermal efficiency and soundproofing.
1. PIR (Polyisocyanurate) Boards
✔ Best for: High thermal resistance in thin spaces (e.g., external walls).
✔ Thickness: Typically 50mm–100mm.
✔ R-Value: ~5.0–6.0 per inch (excellent heat retention).
✔ Pros: Lightweight, easy to cut, moisture-resistant.
✔ Cons: More expensive than mineral wool.
2. Mineral Wool (Rockwool/Glass Wool)
✔ Best for: Soundproofing and fire resistance.
✔ Thickness: 50mm–150mm.
✔ R-Value: ~3.0–3.5 per inch.
✔ Pros: Fireproof, excellent sound absorption, flexible fit.
✔ Cons: Can irritate skin/lungs (wear PPE).
3. Foam Boards (EPS/XPS)
✔ Best for: Cavity walls and floors.
✔ R-Value: ~3.5–4.5 per inch.
✔ Pros: Water-resistant, budget-friendly.
✔ Cons: Less effective for soundproofing.
Correct Installation Methods
Proper installation maximizes insulation performance.
1. Between Studs (Metal/Timber Framing)
✔ Measure & Cut Tightly – Snug fit prevents thermal bridging.
✔ Stagger Joints – Avoid gaps by overlapping insulation slightly.
✔ Use Insulation Supports – Wire or netting holds wool in place.
2. Behind Plasterboard (Dot & Dab Walls)
✔ Fix Insulated Plasterboard – Pre-bonded PIR boards save time.
✔ Adhesive Application – Apply directly to masonry with dabs.
3. Floating Floors/Ceilings
✔ Lay Between Joists – Mineral wool for sound dampening.
✔ Resilient Bars – Decouple plasterboard to reduce noise transfer.
Pro Tip:
Seal edges with acoustic sealant to block air gaps.
Enhancing Acoustic Performance
For superior soundproofing, combine methods:
1. Double-Layer Drywall
✔ Green Glue Compound – Applied between layers for damping.
✔ Staggered Seams – Prevents sound leaks.
2. Resilient Channels
✔ Metal Furring Strips – Isolate plasterboard from structure.
✔ Reduce Impact Noise – Ideal for ceilings.
3. Mass-Loaded Vinyl (MLV)
✔ High-Density Layer – Installed under plasterboard.
✔ Blocks Low Frequencies – E.g., bass, footsteps.
4. Acoustic Plasterboard
✔ Denser Core – Reduces sound transmission.
✔ Best Paired With: Mineral wool for full soundproofing.
Summary Table: Insulation & Soundproofing Solutions
Final Tips:
Always wear gloves, mask, and goggles when handling insulation.
For best results, combine insulation + decoupling + mass.
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