I want to mount a credenza about 4' wide and 3' feet tall. It has 3 levels of shelving which I'm planning on filling with glassware. My boyfriend bought 2 brackets to screw in at the bottom and plans on mounting the whole unit on those as if it was a shelf. He also got some butterfly sinkers to add in somewhere in the middle so it won't fall forward. But I'm concerned that those brackets will eventually loosen and start to lean forward or even give way all together.
Is this approach going to work or should we use another method?
Toggle bolts probably won't work for that. They only depend on the strength of the drywall. I believe they are only rated for 50lbs. The best way would be to actually locate wood studs and use #12x3 1/2" screws to secure it. As for angle brackets, they need to be strong enough to carry the weight or they will fail as well.
Toggle bolts will not work.
If you plan to "hang" this credenza and store glass, it has to be secured to studs on the wall, Any other solution that relies only on the drywall will fail, and the glass items will not survive the fall. And I suspect neither will your boyfriend.
Purchase a good quality stud finder read the instructions and test where you think a stud is by driving a screw into the wall to ensure you have found a stud.
Use at least 2 1/2 or 3 inch screws, with a "cabinet" washer, (Hardware store staff can help you with this) which can me either chrome or brass.
Any time you have to anchor something with weight to a wall constructed of drywall over studs is to find a stud to screw into.
From the dimensions you have in your post, you will fins one or more behind the location for the install.
Screw directly to the stud through the drywall.
Mount some brackets under the middle shelf where they won't be visible and screw them in properly as well.
Hope this helps.
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