Air leakage, or infiltration, occurs when outside air enters a house uncontrollably through cracks and openings. Properly air sealing such cracks and openings in your home can significantly reduce heating and cooling costs, improve building durability and create a healthier indoor environment.
It is unwise to rely on air leakage for ventilation because it can’t be controlled. During cold or windy weather, too much air may enter the house. When it’s warmer and less windy, not enough air may enter. Air infiltration also can contribute to problems with moisture control. Moldy and dusty air can enter a leaky house through such areas as attics or foundations. This air in the house could cause health problems. The recommended strategy in both new and old homes is to reduce air leakage as much as possible and to provide controlled ventilation as needed.
Air Sealing an Existing Home:
Air sealing is one of the most significant energy efficiency improvements you can make to your home. Air sealing will not just reduce energy costs; it will also improve your home’s comfort and durability.
Detecting Air Leaks:
You may already know where some air leakage occurs in your home, such as under-the-door draft, but you’ll need to find the less obvious gaps to properly air seal your home. For a thorough and accurate measurement of air leakage in your home, The Insulation Man will perform an energy assessment, particularly a blower door test. A blower door test, which depressurizes a home, can reveal the location of many leaks. A complete energy assessment will also help determine areas in your home that need more insulation.
Blower Door Tests:
Blower Door Test
Our professional energy auditors use blower door tests to help determine a home’s air tightness.
These are some reasons for establishing the proper building tightness:
A blower door is a powerful fan that mounts into the frame of an exterior door. The fan pulls air out of the house, lowering the air pressure inside. The higher outside air pressure then flows in through all unsealed cracks and openings. The auditors may use a smoke pencil to detect air leaks. These tests determine the air infiltration rate of a building.
Blower doors consist of a frame and flexible panel that fit in a doorway, a variable-speed fan, a pressure gauge to measure the pressure differences inside and outside the home, and an airflow manometer and hoses for measuring airflow. The calibrated blower door’s data allow the auditor to quantify the amount of air leakage and the effectiveness of any air-
Purpose of Ventilation: