Installing windows can be tricky. Try it without knowing how to do it right or skip a step, and you run into problems. At a minimum, the warranty will become invalid if the window isn’t installed to the manufacturer’s specifications. More seriously, if window flashing is not properly installed, rain water can leak behind the windows and enter walls. If wet building materials can’t dry, moisture has the potential to seriously damage the home. Moisture intrusion can lead to mold growth, a cause of unhealthy indoor air. It can also lead to wood rot, which creates structural problems.
For more information, see our diagram below illustrating the preferred method when installing flanged windows in an envelope that will use an exterior sheathing as a drainage plan. Following these steps will minimize the potential for moisture intrusion and contribute to a quality home. Planning for frequent inspections is also important to ensure the windows are installed properly.
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