What are three infiltration points commonly found in a building envelope?

Three infiltration points in a building envelope are specifically identified as points where outside air can enter the conditioned space of a building, often leading to energy loss and potential comfort issues. The top plate, windows, and exterior doors are particularly critical because they are common locations where air leaks occur due to gaps, poor sealing, or inadequate insulation.

The top plate is where the wall framing meets the ceiling framing, and it can be a source of significant air leakage if not properly sealed. Windows are another major infiltration point; they can have air leaks around the frame or through improper installation, allowing outside air to enter and conditioned air to escape. Exterior doors also present a risk of infiltration, especially if they are not adequately sealed or if the weather stripping is worn or damaged.

This selection highlights the importance of focusing on areas that are prone to leaking air, as addressing these points can lead to more effective building envelope performance, improving energy efficiency and occupant comfort.