It depends on the house. A 70 mph wind would peel shingles and vinyl siding and perhaps take down gutters from most houses. A house with a poorly made roof may suffer more severe roof damage. Some windows may break. A 70 mph wind can also topple trees, and a large, falling tree can partially destroy a house.
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If these 70 mph winds are from a tornado, where the air pressure is very low, then the wind can tear off the roof without the right building codes being followed.
5,280 feet = 1 mile
It is 1609.344 metres per hour.
1 mile = 1.609344 kilometer 1 mile per hour = 1.609344 kilometer per hour 26.62 miles per hour = 42.841 kilometers per hour (rounded)
1.60934 km per hour
15 miles/hour