Insulation Calculator – Estimate Fiberglass & Blown Insulation Quantity
Installing attic, wall or crawl space insulation requires precise material calculation. Many homeowners underestimate rolls and bags due to cut waste around joists, pipes and vents. This free insulation calculator computes total square footage and required insulation material with customizable waste factor for residential energy upgrade projects.
Tool Features
- Supports fiberglass roll and blown-in attic insulation two main types
- Adjustable waste percentage for pipes, vents and framing cutouts
- Fast square footage to insulation roll/bag conversion
- Designed for attic, exterior wall, crawlspace energy retrofits
- Free DIY & contractor material planning utility
Common Usage Scenarios
- Attic insulation upgrade for winter heating cost reduction
- Exterior wall fiberglass insulation new home construction
- Crawl space thermal barrier insulation installation
- Energy audit recommended insulation replacement projects
Frequently Asked Questions
Q: How much waste should I add for attic insulation?
A: Standard simple attic:8–10% waste. Attics full of plumbing and vent openings use 12–15% extra insulation.
Q: What insulation type is better for old attics?
A: Blown loose-fill insulation fills gaps better than fiberglass rolls for uneven older roof framing.