Why Insulate Plaster Walls?

Main Benefit: Energy Efficiency
- Older homes with plaster walls tend to be drafty, leading to higher heating and cooling bills.
- Insulation helps regulate indoor temperatures, keeping your home warmer in winter and cooler in summer.
- Potential Savings: Homeowners save an average of 15% (or $200–$600 per year) on utility bills with proper insulation.

Challenges of Insulating Plaster Walls

• Moisture Risks: Poorly installed insulation can trap moisture, causing mold and wood rot.
• Structural Integrity: Drilling or retrofitting can damage the lath and plaster if not done correctly.
• Repair Needs: Cracks in plaster may need repair before and after insulation to prevent further damage.

How Professionals Insulate Plaster Walls

• Inspection & Prep: Identify cracks, repair damage, and ensure structural stability.
• Blown-in or Spray Foam Insulation:
• Loose Fill or Foam: Injected through small holes in the walls.
• Sealed with a vapor-resistant primer and water barrier to prevent moisture buildup.
• Optional Additions:
• Cladding: Extra insulation layer between the outer wall and insulation.
• Rainscreen Layer: Ensures water doesn’t penetrate walls.
• Final Touch: Repaint walls with vapor-resistant paint for added protection.

Costs of Insulating Plaster Walls

• Labor & Materials: $1–$4 per square foot.
• Spray Foam Insulation: $0.45–$1.50 per board foot.
• Blown-in Cellulose: $0.60–$2.30 per square foot.
• Plaster Repairs: $200–$1,200, depending on damage.
• Home Energy Audit: $100–$1,650 (Average: $407).

DIY vs. Professional Installation

DIY Challenges:
- Improper insulation can lead to moisture problems and structural damage.
- Requires expertise to ensure proper sealing and vapor barriers.

Why Hire a Pro:
- Ensures the integrity of plaster walls and prevents future damage.
- Includes proper sealing, moisture resistance, and professional repairs.

Summing it up

• Insulating plaster walls is an effective way to save energy and reduce utility costs.
• Proper installation by a professional is critical to avoid mold, rot, and structural damage.
• Pair insulation with a home energy audit to maximize efficiency and identify other areas for improvement.
• The return on investment (ROI) is high, with long-term energy savings and increased home value.

If you're dealing with drafty plaster walls, adding insulation is a wise choice—but leave it to the experts for best results!

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