Why was fiberboard used as sheathing in the 70's?

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SeattleDIY

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My house was built in 1976. the "sheathing" is black fiberboard. I have heard some refer to it as sound board. I hate this stuff.

Can anyone explain why it was used and when they started and stopped using it??
 

inspectorD

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It was cheaper than plywood or regular wood and had insulating value.
They did not pay attention to what bugs and vines and water does to it.:D

It was the newest sliced bread.:rolleyes:
 
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