Professional Insulation Guide

Complete professioneller Leitfaden to calculating, selecting, and installing insulation.

Calculate Insulation Needs

Use our Insulation Calculator for precise estimates.

R-Value Requirements by Climate

• Attic: R-38 to R-60
• Walls: R-13 to R-23
• Floors: R-19 to R-30
• Basement: R-11 to R-19

Material Coverage

Fiberglass batts:

• R-13 (3.5"): 48-88 m² per bag
• R-19 (6"): 40-64 m² per bag
• R-30 (10"): 24-40 m² per bag

Blown-in cellulose:

• R-30: 40-50 m² per bag
• R-38: 32-40 m² per bag
• R-49: 25-32 m² per bag

Insulation Costs

Material costs:

• Fiberglass batts: $0.30-0.70/m²
• Blown cellulose: $0.60-1.20/m²
• Spray foam: $0.50-3.50/m²
• Rigid foam: $0.75-2.00/m²

Installation costs:

• DIY batts: Material only
• Professional batts: +$0.50-1.50/m² labor
• Blown-in: $0.50-3.00/m² installed
• Spray foam: $3-7/m² installed

Installation Guide

Fiberglass Batts

1. Measure cavity depth and width
2. Cut batts to fit (compress minimally)
3. Fit snugly without gaps
4. Wear protective gear (gloves, mask, goggles)
5. Install vapor barrier facing warm side

Blown-In Insulation

1. Rent insulation blower
2. Calculate bags needed
3. Fill cavities evenly
4. Achieve target depth for R-value
5. Use depth markers

Common Mistakes

1. Compressing insulation (reduces R-value)
2. Gaps around obstacles
3. Wrong vapor barrier direction
4. Inadequate ventilation
5. Missing PPE (protective equipment)

Energy Savings

Proper insulation can:

• Reduce heating/cooling costs 10-50%
• Improve comfort
• Reduce HVAC size needed
• Pay for itself in 2-10 years

FAQ

How much insulation do I need for 1000 m² attic?
For R-49, about 25-32 bags of blown cellulose or 400-600 m² of batts (multiple layers).

What R-value do I need?
Depends on climate zone. Check energy.gov zone map. Generally R-38 to R-60 for attics.

Can I install insulation myself?
Batts: Very DIY-friendly. Blown-in: Possible with rented equipment. Spray foam: Hire professional.

Is more insulation always better?
Up to a point. Diminishing returns after R-60 in most climates. Focus on air sealing too.

Calculate Your Insulation

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Get accurate R-value and material estimates.

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Stay warm, save energy!