Different types of insulation play a big role in keeping buildings warm. They help trap heat inside by slowing down how fast heat moves out. Here are some important things to know about how insulation works:

Key Points About Insulation

• R-value: This tells us how well insulation resists heat moving through it. A higher R-value means better insulation.
• Moisture Resistance: Good insulation should keep water out to prevent damage.
• Air Infiltration: Insulation should help block drafts and keep air from leaking in or out.

Common Insulation Materials

1. Fiberglass

   • R-value: $2.9 - 4.3$ per inch
   • Doesn't catch fire and keeps water out.

2. Foam Board

   • R-value: $3.6 - 5.0$ per inch
   • Very good at keeping heat in your home.

3. Cellulose

   • R-value: $3.1 - 3.7$ per inch
   • Made from recycled paper, and does a nice job insulating.

4. Spray Foam

   • R-value: $6.0 - 7.0$ per inch
   • Expands to fill in cracks, which helps stop air leaks.

How Heat Moves

• Conductive Heat Loss: About 25-30% of heat in homes is lost through walls.
• Insulation Impact: Good insulation can lower heating bills by $20-30\%$ each year.
• Optimal Thickness: Adding insulation to reach an R-value of 38 can really keep the heat in, especially in colder areas.

Overall, using the right insulation is very important. It helps save energy and keeps homes comfortable all year round.