- Seal holes or gaps around chimneys or furnace flues to prevent air leaks.
- Use metal flashing for larger gaps and high temperature caulk for smaller ones.
- Identify and seal all air leaks before adding additional insulation.
- Seal small gaps around plumbing stacks and electrical wiring.
- Use caulk for small gaps and spray foam for gaps up to 3 inches in diameter.
- Use a combination of foam board and foam spray for gaps larger than 3 inches in diameter.
Attic Hatch or Door
- Use weatherizing materials or a pre-made attic cover to insulate your attic hatch or door.
- Save energy and keep your home comfortable.
- Learn more:
- A home’s exterior is known as the “envelope” or “shell” which, when properly insulated, can save up to 10% on annual energy bills.
- Or hire a contractor who’ll use specialized diagnostic tools to identify and seal hidden air leaks before adding insulation.
- TIP: if your insulation is level with or below the attic floor joists, you’ll need to add more.
- Recommended insulation level for most attics is 12-15 inches, depending on insulation type (R-38).
- Seal any holes or tears using mastic or metal (foil) tape.
- Don’t use “duct tape” because it doesn’t last.
- Seal all accessible ducts in the house, including the basement, garage or crawlspace.
- Learn More:
- Ducts distribute conditioned air through houses using forced air heating and cooling systems.
- Up to 20% of air is lost due to leakage, holes and poorly connected ducts.
- Result: an inefficient HVAC system, high utility bills and uncomfortable room temperatures.
- Proper attic ventilation using natural airflow prevents build-up of ice dams and extends the life of roof shingles.
- Eliminates need for attic vent fan, thereby reducing energy costs.
- Make sure attic soffit and gable vents aren’t blocked to ensure free airflow.
- If you don’t have gable vents, you may have ridge vents or vents through the roof deck.