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I have a 15-20lb wood bathroom cabinet (24 inches wide, few feet tall) and I'll be looking to load it up with heavy bathroom supplies. Problem is there is only one stud available. Do you think one stud + drywall anchors on the other side is enough support? I was thinking it'd be best to cut out the drywall and put a backer board in between the studs?

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How wide is the cabinet? –  The Evil Greebo Nov 26 '12 at 15:16
    
24 inches, the stud is about 9 inches inside on one edge. –  dotjoe Nov 26 '12 at 15:17
    
Deleted because of revised previous edit. –  The Evil Greebo Nov 26 '12 at 15:19
    
updated, I'm going off memory....the 27 inches I think is the max width I had available. –  dotjoe Nov 26 '12 at 15:19
    
Next question: HOW heavy? –  The Evil Greebo Nov 26 '12 at 15:20
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1 Answer

up vote 6 down vote accepted

While having all four mount points connect to structure (aka: the stud) is ideal, I think in your case, having two mount points in wood and two in a drywall anchor, you're going to be ok.

Consider this question: What is the weight capacity of a drywall screw?

One drywall screw CAN (not should) hold a lot of weight for its size. Also a properly installed drywall anchor can typically stand 70~ pounds of pull force (as in pulling out, not down).

With two WOOD (not drywall - wood) screws set into the available stud and 2 (or better, 4) drywall anchors, I think you're not likely to exceed the capacity. If your cabinet total weight when full is < 100 lbs you're probably not going to have a problem.

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I'll do an extra 2 drywall anchors. So 6 total mount points. I'm gonna throw a 2x4 on the wall so I can rest the cabinet on there while I drill all my pilot holes. Thanks –  dotjoe Nov 26 '12 at 15:43
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