Insulation, Sill Sealer

Definition

Sill Sealer is a type of insulation placed between the sill plate of a building and the supporting concrete or masonry foundation to prevent air leaks and improve thermal efficiency.

Purpose

The sill sealer creates an airtight seal between the foundation and the framing of a building, preventing drafts, reducing heat loss, and minimizing the risk of moisture intrusion.

Examples of Use

• Installing sill sealer strips between the wooden sill plate and concrete foundation of a house.
• Using sill sealer to prevent air infiltration in basement walls.
• Applying sill sealer in new construction to enhance the building envelope's airtightness.

Related Terms

• Sill Plate: The bottom horizontal member of a wall or building to which vertical members are attached.
• Air Infiltration: The unwanted flow of outside air into a building through cracks and openings.
• Building Envelope: The physical barrier between the interior and exterior of a building, including walls, floors, roofs, windows, and doors.

Notes

Sill sealer is typically made from foam or fiberglass and is an inexpensive but effective way to improve a building's energy efficiency and comfort.