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Wall Spreader Weight limit?

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I have a wooden 2x4 wall spreader, about 11.5ft wide. If it's going into dry-wall, what exactly is the weight limit before it begins to slip?

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Will the load be at the center of the 11 and a half feet or more towards one end?  That will be one factor in determining the amount he wood will defect at a given load.  What type of wood? SPF, "white wood", something else?  Kiln dried or S-Grn?  Are the base plates of the spreader directly over  a stud or do you intend to use scabbing to bridge the studs?

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His test is the spreader up against a plywood wall.  A different scenario than the same spreader against a plaster or sheetrock wall. The plywood isn't going to crush or crumble as pressure is applied.

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