Inspect windows and doors for air leaks.
How to detect cracks in window and door.
You can tell that a pressure crack has occurred due to the shape of the break in the glass.
Turn off the furnace and water heater and turn on exhaust fans.
Doors and windows another way to test the seriousness of a wall crack is to open and close internal doors to bedrooms and bathrooms and evaluate whether the doors stick.
The windows cannot withstand the pressure of these scenarios and will crack as a result.
Stress cracks can form when there is a large difference between the temperatures inside and outside your home.
Check the exterior caulking around doors and windows and see whether exterior storm doors and primary doors seal tightly.
In most cases the crack will follow a curve in the shape of an hourglass.
You can usually find them near the edge of the window glass.
Hold a lit incense stick by windows outlets doors and any other suspected areas.
Stress cracks start off small and then expand and grow across the glass.
Another option for detecting air leaks is using an infrared thermometer which is a non contact thermometer that can measure the ambient air temperatures around window and door frames.