Could be any of the following, or a combination of them:
(1) Inadequate design with a very large span. This is more typical for modern houses with large unobstructed spaces.
(2) Inadequate framing, unsuitable for the large span. Could be inadequate size of girders, or inadequate spacing between girders.
(3) Inadequate fastening between the floor, subfloor, and girders. Could also be inadequate or absent cross-bracing between adjacent girders.
The end result is a floor structure that is not rigid enough.
In anycase, this sounds like a case of poor workmanship. There could be other issues that are not immediately obvious.
Although the wood houses in America are never as sturdy as brick/concrete houses, some wood houses are much less sturdy than others. It has a lot to do with workmanship.
Some professional help is needed as suggeted by others.
(1) Inadequate design with a very large span. This is more typical for modern houses with large unobstructed spaces.
(2) Inadequate framing, unsuitable for the large span. Could be inadequate size of girders, or inadequate spacing between girders.
(3) Inadequate fastening between the floor, subfloor, and girders. Could also be inadequate or absent cross-bracing between adjacent girders.
The end result is a floor structure that is not rigid enough.
In anycase, this sounds like a case of poor workmanship. There could be other issues that are not immediately obvious.
Although the wood houses in America are never as sturdy as brick/concrete houses, some wood houses are much less sturdy than others. It has a lot to do with workmanship.
Some professional help is needed as suggeted by others.
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