Air leaks can negate the benefits of new insulation, experts say

Why does a room still feel cold even after new insulation has been installed? According to an article in HelloNation, the answer lies in air sealing. Air leaks, which can go unnoticed, can significantly impact the effectiveness of insulation, leading to wasted energy and discomfort.

Insulation works by slowing the transfer of heat through walls, floors, and ceilings. However, it does not stop air from moving through cracks, gaps, or unsealed openings. A fully insulated home can still lose conditioned air through small leaks, especially in common trouble spots like window frames, door thresholds, attic hatches, and areas where pipes or wiring pass through exterior walls.

Insulation expert Darren Haggett, of Builders Installed Products of New York LLC, based in Albany, New York, explains that air sealing and insulation should work together. "Air sealing closes the gaps that let air escape, while insulation slows the heat moving through the surfaces that remain," Haggett said.

Haggett notes that certain areas of the home are particularly prone to temperature swings, including rooms above garages, additions, and spaces near exterior corners. These areas often have more seams and transitions where air can move freely.

Older homes tend to have more air leakage than newer constructions. Settling, aging materials, and outdated building techniques can all contribute to gaps that were never sealed properly. Adding more insulation without addressing the underlying air leaks can produce less improvement than homeowners expect.

To identify where air is escaping, homeowners can start with a visual inspection or a blower door test. Sealing these areas with the right materials creates a more consistent barrier for the insulation to support. Attics, basements, and crawl spaces are frequent starting points because they often contain the largest and most accessible gaps. Sealing these areas can make a noticeable difference in comfort.

While windows and doors are important, their impact is often smaller than homeowners expect. Weatherstripping and caulking can help, but they rarely account for most of the air loss in a typical home.

Haggett emphasizes that air leaking into an attic can pull conditioned air away from the rooms below, forcing heating and cooling systems to work harder. Persistent drafts near baseboards, cold spots on interior walls, and rooms that never quite match the thermostat setting are common signs of leakage. Higher-than-expected utility bills can point to the same issue.

A professional assessment, including tools like thermal imaging or a blower door test, can reveal leaks that are not visible during a normal walkthrough. This information helps homeowners set realistic expectations before starting a project.

According to Haggett, addressing both air sealing and insulation is crucial for creating a comfortable and energy-efficient home. "By treating the home as a connected system, you can ensure that the insulation is working as intended," he said.

The article underscores the importance of a comprehensive approach to home insulation and air sealing. Proper sealing can significantly enhance the effectiveness of insulation, leading to a more comfortable and energy-efficient living environment.

In conclusion, the article in HelloNation provides valuable insights from Darren Haggett, helping homeowners understand the interplay between air sealing and insulation. It offers a practical starting point for those looking to improve their home's comfort and energy efficiency.