From a search on another site: "Assuming 70 LPs per foot and 1/2 pound per record, you're looking at about a hundred pounds" (for three feet of LPs)
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Another comment: " weighed a sampling of LPs a few years ago and came up with an average of 0.45 lbs apiece
My own measurements range from 80 LPs per foot with NO gatefold LPs in the bunch, down to 65 LPs with a number of gatefold or double albums in the count.
Another line.. A foot of LPs weighs 40lbs. (from my memory that is too low, more like 50lbs)
Ten years back, on another site, when I calculated my 6 unit tall shelving I arrived at 250 pounds/sq ft weight pressing on floor. (do not ask me how I arrived at that value)
One big problem is records vary tremendously. Particularly gatefold covers for one LP really use up space. With say 1/3 or even 1/4 of the foot weighed, gatefold, the weight is reduced a LOT.
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