Air leaks pose a significant challenge for homeowners, often leading to increased energy costs and discomfort. Identifying these leaks can be difficult, and sealing them effectively can require specialized solutions.
While draftiness in a home is a clear indicator, it is essential not to assume that doors and windows are the primary culprits. Research indicates that only 20% of air leaks in homes originate from these sources.
Indicators of Air Leaks
Several signs can point to air leakage in a house. An unexpected rise in utility bills or higher-than-average heating and cooling expenses compared to similar homes might suggest the presence of leaks.
Temperature disparities, such as a warmer upper floor and a cooler basement, often indicate leakage in the ductwork. Additionally, a home rapidly accumulating dust can signify leaks in the supply ventilation system, which may lead to negative pressure and the intrusion of dusty air from less visible areas like attics and crawlspaces. Frequent indoor allergy symptoms also point to outdoor air infiltrating the home.
Performing a Visual Inspection
Conducting a visual inspection is crucial in identifying potential leak sites. Examination should begin at the home’s exterior, focusing on spots where the siding meets the foundation, as well as around exterior brick or chimneys.
Attention should be given to gaps, cracks, and openings at all exterior corners, alongside utilities like faucets and supply lines to check for appropriate caulking. Inside, inspect utilities, sink drains, electrical outlets, and switch plates for drafts. Additionally, dirty streaks on light-colored carpets near interior walls might indicate an internal pressure imbalance exacerbated by leaks.
Common Sources of Air Leaks
Contrary to common assumptions, windows and doors are not the primary sources of air leaks
Contrary to common assumptions, windows and doors are not the primary sources of air leaks. The attic floor is typically the most susceptible area, followed by ductwork. Ensure that plumbing and electrical vents on the attic floor are sealed correctly. Run a hand along exposed ductwork to detect leaks, particularly where sections join, though much of the ductwork might be inaccessible.
Sealing Solutions
Engaging professional contractors to seal duct leaks using Aeroseal duct sealing technology is an effective solution. This technique mitigates the errors associated with manual sealing and ensures that even the normally inaccessible duct sections are sealed thoroughly.
Using a Pressurization Test
For homeowners identifying duct leaks, a building pressurization test may reveal deeper issues with the home's air distribution system. Conducted with a blower door by HVAC professionals, this test can highlight minor HVAC system problems before they escalate into costly repairs. The test works by expelling air out of the home, helping to determine if a pressure imbalance exists.
Air leaks can be a big, expensive issue for homeowners. They can be hard to locate and even harder to seal without the right solution. But there are several signs to look for to see if a home is leaking air.
A drafty home is the most obvious sign that one has air leaks. But don’t assume they are due to the home’s doors or windows. Research shows that only 20 percent of home air leaks are from doors and windows.
Signs for air leaks
The following are signs that suggest a house may have air leaks:
High Utility Bills
If users see an increase in their monthly utility bills, or notice it costs more to heat and cool the house compared to someone with a similarly sized home, this can be due to air leakage.
Hot And Cold Rooms
If one lives in a two-story home with a basement and notices the second floor is hot and the basement air is cold, the ductwork is probably leaking.
Excessive Dust
Homes that quickly accumulate dust are a likely sign of duct leakage on the home’s supply ventilation system. This can cause negative pressure in the house, which draws dusty air in from attics, crawlspaces, and garages.
Indoor Allergies
Family members’ allergies act up depending on the season and the location. But if they act up frequently in the home, it’s because of outside air leaking in.
Air leaks negatively affect the home energy efficiency and can increase the energy bills significantly.
Performing a Visual Inspection
A visual inspection can help users find spots where the home’s interior or insulation is exposed
Finding leaks outdoors can be difficult to impossible, but a visual inspection can help users find spots where the home’s interior or insulation is exposed. Easy spots to examine include where the home’s siding meets the foundation, exterior brick, or chimney.
In addition to looking for missing siding, look for gaps, cracks, and openings on all exterior corners of the home. Check to see if faucets have enough caulking where pipes meet the home, along with other utilities like the gas supply or the electrical service.
Moving from outside to inside the home, continue to check for air leaks around utilities for proper caulking where they enter the home’s interior, including sink drains. Then check electrical outlets and switch plates for drafts. If light-colored carpets next to interior walls are dirty, this may indicate a pressure imbalance in the home.
Check Common Sources of Air Leaks
It’s critical to look for plumbing and electrical vents on the attic floor and make sure they’re properly sealed
Everyone assumes a home’s windows and doors leak the most air, but the leakiest surface of a home is the attic floor, followed by its ductwork.
As a result, it’s critical to look for plumbing and electrical vents on the attic floor and make sure they’re properly sealed. Users can also run their hand along exposed ductwork to try and feel leaks, especially where pieces of ductwork are joined together.
Most of the home’s ductwork won’t be easily accessible, if at all.
Sealing the gaps
Professional contractors can seal the ducts from the inside, using Aeroseal duct sealing technology.
This eliminates the errors and inconsistencies of manual duct sealing and ensures all of the home’s ductwork is sealed, even the inaccessible ducts located behind walls and in the attic.
Building Pressurization Test for Air Leaks
This pressurization test pushes air out of the home using a blower door
If users find air leaks in the ductwork, their home may have a pressurization issue. Pressurization ensures air is distributed throughout the home evenly and efficiently. A professional blower door test will determine if there is a problem.
This pressurization test pushes air out of the home using a blower door, and this test should be performed by an HVAC professional.
It can help identify small problems with the HVAC system before they become big and expensive.
