What wind speeds and gusts can usually damage houses or trees? In my region wind speed increases in Autumn. It reaches to 30 km/h with gust up to 40 km/h. I want to know at which speed the wind and gust can cause small damage of the normal window glass (We mostly using PVC for the windows).

Tonight I noticed that ventilizer fan damaged due to opposite wind direction and cause to stop. Also, my TV Antenna was completely damaged (I couldn't find it).

I want to know Wind and Gust speeds that can cause damage to usual house, outdoor cables, antenna, windows?

Thanks
This Beaufort Scale of Wind Force image may help answer your question.



source: strleng.blogspot.com