To help keep air from escaping through the attic, seal the gap between the attic hatch door frame and the ceiling joists.
- Pick a day when the attic temperature is bearable.
- Remove loose pieces of insulation in the gap before foaming.
- Fill in the space between the four sides of the attic hatch door frame and the ceiling joists.
There's often a gap in a basement where the pressure-treated wood-sill plate rests on top of the concrete foundation. In an unfinished basement, these gaps will be evident. In a finished basement with a dropped ceiling, the ceiling tiles will need to be removed to access the sill plate and the foundation.
- Cover the basement floor before foaming.
- Slowly fill the void, moving the can along the gap as you foam. Apply foam in a continuous bead, with no voids or breaks, to achieve an effective seal.
Plumbing pipe penetrations may allow bugs and unwanted air into the living space.
- Check for holes under sinks where the pipes enter from the floor or wall in all rooms that have running water (kitchen, bathroom, utility room and laundry room).
- Cover the area before foaming.
- Seal around the pipes at the wall or floor entrance.
Holes may be hiding under electrical outlet covers.
- Turn off the main electrical switch for the area of the home you'll be air-sealing.
- Use a screwdriver to remove all outlet cover plates.
- Check for gaps between the wall and the metal or plastic box that houses the electrical socket.
- Fill the gap around the perimeter of the electrical box. Avoid foaming anywhere inside the box.
- Allow foam to cure completely. Trim excess foam so the foam it's flush with the wall.
- Replace outlet covers.
Window and Door Framing
Installing new windows and doors can significantly improve a home’s energy efficiency. During installation, make sure to fill the gaps around the window or door frame and the rough opening.
- Ensure that the window / door and frame surfaces are clean.
- Fill the void between the window / door and the rough opening.
- Apply foam in a continuous bead, with no voids or breaks, to achieve an effective seal.
- For window applications, apply foam around all four sides. For door applications, apply foam around the top and sides only.