R-Value Guide
Understanding insulation effectiveness by material.
- Fiberglass R-3.1 to R-3.4 per inch
- Cellulose R-3.5 to R-3.7 per inch
- Spray Foam R-6.0 to R-7.0 per inch
- Rigid Foam R-4.0 to R-6.5 per inch
Code Requirements
Walls
R-13 to R-23
Attic
R-30 to R-60
Floor
R-13 to R-30
Crawl Space
R-10 to R-19
Installation Tips
- Vapor Barrier Face toward living space
- Air Gaps Avoid compression
- Ventilation Maintain proper airflow
- Moisture Control condensation