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Why did they use gypsum board?


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I saw this yesterday in a modular house. Two layers of gypsum board at the band joists and the center beam. I assume it is for fire-stopping, but have never seen this before. Any idea as to why it was used? The band joist is a double 2x10, as is the beam.

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...here modulars are state monitored and inspected, with a little stamp stuck on inside of electric panel cover...your state should be able to offer some reason.

Back when this was built we had not state code. Most areas followed BOCA or CABO. Very few areas made amendments to codes, unless it was to make them less restrictive.

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