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A sister joist is used in construction to provide additional support and reinforcement to an existing joist that may be damaged or weakened. It helps distribute the load more evenly and strengthens the structure of the building.

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4mo ago

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A sister floor joist is an additional joist installed next to an existing one to provide extra support and strengthen the floor structure. It helps distribute the weight more evenly, reducing the risk of sagging or structural damage. This contributes to the overall stability and durability of the building.