Replacing your asphalt shingles with a steel roof should not have a direct impact on your in-home wifi signal. However, there are a few factors to consider:
Distance: The further away you are from your wifi router, the weaker the signal will be. If your steel roof installation involves adding more layers or insulation to your roof, it could potentially increase the distance between your router and your device, resulting in a weaker signal.
Interference: Metal objects can sometimes interfere with wireless signals, including wifi signals. However, a properly installed steel roof should not significantly interfere with your wifi signal. You can also minimize interference by placing your router in a central location and away from large metal objects or appliances.
Other factors: There may be other factors that can affect your wifi signal, such as the number of devices connected to your network, the strength of your router, and the materials used in the construction of your home.
Overall, while there may be some minor factors to consider, the installation of a steel roof should not significantly impact your in-home wifi signal as long as your router is in good working condition and is located in an optimal location within your home. If you have concerns about your wifi signal after a steel roof installation, you can consult with a professional to assess your wifi setup and make any necessary adjustments.