FireGryphon wrote:When you secure a unit to a plaster wall using multiple anchors, how do you determine how much the unit can hold? For example, if I hang something, like a shelving unit, with four anchors that can each hold 50 lbs., does that mean the unit can support 200 lbs.?
just brew it! wrote:Only if you like living on the edge and the weight is distributed perfectly evenly.
Did you really mean plaster, or did you mean drywall?
For best strength, you really need to use some long wood screws and attach to the studs (assuming you have wood studs and not metal).
just brew it! wrote:Is this a floor standing unit (with the bolts just to keep it from tipping), or are the bolts supporting the entire weight of the unit?
For anything that will bear substantial weight you really need to screw into the studs. At the very least, you ought to make sure your anchors are long enough to go all the way through the plaster into the lath. I would not trust plaster + anchors alone -- especially if the plaster is fairly old -- with anything heavy.
FireGryphon wrote:but I wanted to get an idea if anchors' support weight adds up when you use more than one.
just brew it! wrote:Since he's got plaster, I figure he's probably OK if he can at least get some toggle bolts through the lath.But yeah, studs would be best.
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