I am taking on replacing my utility sink with a wall mounted sink. I know that I have to have support and plan to open the drywall to install backing (fortunately, I have a stud on the left side for hanging, only requiring me to back the right side. The sink weighs 55 lbs. I do not plan to use legs and want to know if lag screws will be solid enough to hold the sink to the wall. I originally bought brackets (picture attached), but I am unsure that I need them. Any help is appreciated.
Question: Want to know if lag screws will be solid enough to hold the sink to the wall. I originally bought brackets (picture attached), but I am unsure that I need them.
Yes – lag screws would be able to support the weight. And the use of the bracket depends on the points I bring up when installing this sink as a utility sink.
Your utility sink was free standing and most likely had a splash panel on the back or the area behind it was protected from water. The drywall was either backer board or drywall cover by appropriate layer to prevent water damage.
Using the lag screws with appropriate washer is doable, if the proper support is provided on the right side as you stated. You must be careful when tighten the lag screws enough to hold the sink securely WITHOUT overtighten that the sink or coating will crack. A heavy rubber gasket between two washers can be used, but again do not over tighten.
Use of the brackets: After securing the two brackets flushed to the surface with appropriate long heavy screws (3” deck screws/) to the support, you will be able to just lift the sink and hook the sink to the two brackets. The part on the left of your picture are L hooks. Push the sink over the hooks, and the hooks will garb the sink. Using the brackets, you do not have to worry about over-tighten the screws.
Using either method of attachment, you can tile or use other design to create your splash panel above or around your sink.
This is the standard sink mounting kit here (France). Probably available in lots of other places, the anglophones call it "sink mounting kit" too...
After installing adequate backing into your drywall where there is no stud, you drill and screw these in pointy end first, make sure the two screws are level and with the right spacing. These is a Hex socket in the back of the screw for an allen wrench.
The idea is that once they're screwed into the wood, you now have two threaded bolts sticking out of your wall which is going to make installing the sink much easier.
Make sure you get the right length.
Notice the soft plastic washer (red arrow). This prevents the sink from cracking. Also the hole is not exactly in the center so you can turn it around to lift or lower one side of the sink by a few mm to set it perfectly level.
After this you put the steel washer and the nut. It's possible to do it alone, although it's a bit acrobatic to hold the sink in place while you reach below to put the nut. Better get help, or put something under it like some cardboard boxes to hold it in place, but at least the two bolts coming out of the wall will hold most of the weight for you...
Once the nuts are on, just tightened by hand, put a level on the sink and rotate the plastic washers to set it just right, then finish tightening.