Installing above counter sink and is leaking on to top of the vanity. There are two holes in the pop up drain i aligned one with the hole to the over flow at base of sink when I fill the sink with water and then drain thje water leaks on to the vanity as well as down the trap....
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If you are installing a basic stainless steel sink into a laminate over particle board counter top-
Find the center of the sink along the legnth of the counter and mark the counter. Measure the sink from the top. Lay out the edges on the counter. Place the sink upside down on the counter and align with your marks. Trace around the sink in pencil. Subtract the distance to the flange where the clips slide in. Draw a new line inside the first one. This is your cut line. Check that when you make the cut that you will not hit the face frame of the cabinet. Move the sink back if needed and make new marks. Some cabinets are a tight fit. Cut the hole for the sink with a jigsaw. Start with the back line first. You may find on a counter with a back splash the jigsaw will not fit. Drill an 1/8" hole to mark the underside and cut from the bottom of the counter. Use a 1" spade bit to drill starter holes at the corners keeping away from the line you traced when the sink was upside down. Stay away from that line or you will have a hole the sink won't cover. Cut the front line. Drill a hole in the center of the counter you can put your finger in to catch the piece when it falls. Now cut the side lines while supporting the counter that is being removed. Discard the slug you removed.
Test fit the sink and remove any extra until the sink just drops in. Remove the sink and set it aside. You need at least 2 sink clips on each side of the sink but use 3 if you can get to them. Determine the location you want the clips at. Use the 3/4" spade bit to drill uot a pocket for the clips to go into. They will normally hit the bottom layer of particle board in the front and back. Center the bit horizontally 3/8" up from the underside of the counter. Drill your holes 1" deep. This is where the spring clip on your sink bolts will grab. You can test that the clips will fit then put a small beed of clear siliconized acrilic latex calk around the edge of the sink and install. Wipe up any extra squeeze out with a wet rag and then tighten the bolts and clean up again.
Now you are ready to install the plumbing. If you are using a new garbage disposer with the dish washer draining into it there is a small plastic disc you have to knock out before the dish washer can drain into the disposal. That plug is there to seal the disposer if you don't have a dish washer.
Get more help if you do not understand all the instructions. If you are pretty handy with mechanical things you should be able to get this done. If you have a different kind of sink please specify that and get more help.
Standard Vanity height is approx 34.5". A vessel vanity is approx 31" high. If you cannot remove the legs from your existing vanity then it will have to be replaced or cut down to the correct height. The reason a vessel vanity is lower is because your sink will be approx 3 to 6 inches higher than a standard drop in sink. This may be more work than it is worth. Vessel sinks most often will require a solid surface top, either glass, stone or another type of composite material. The standard laminate vanity top has a particle board substrate which will detiorate quickly at the drain location.
i have been installing these kind of counter tops for years,there's a ton of stuff you can buy to seal,and protect your counter, one trick is to apply mop and glow to a dry counter let it dry and apply more coats.the good thing about mop & glow is you can remove easy, it works great.good luck
YOU ALSO HAVE A VENT ISSUE, THE VESSEL SINK DOESN'T HAVE THE LITTLE HOLE IN IT LIKE A VANITY SINK, THERE FOR THE WATER IS GOING DOWN THE DRAIN BUT THE AIR CAN NOT COME OUT, YOU NEED TO INSTALL A STUDOR VENT OR AN INLINE VENT INTO THE DRAIN BETWEEN THE WALL AND THE TRAP CUT IN A TEE AND BRING A PIPE UP TO THE BOTTOM OF THE COUNTER TOP AND INSTALL THE VENT, USALLY HAVE TO PUT A FEMALE ADPT ON THE TOP OF THE PIPE THE VENT COMES WITH THREADS DO NOT GLUE IT IN PLACE, THEY HAVE A RUBBER FLAPPER THAT OPENS WHEN THE WATER IS GOING THRU THE DRAIN AND ALLOWS IT TO PULL IN AIR THEN THE FLAP CLOSES WHEN NO WATER IS RUNNING TO KEEP THE SEWER SMELL OUT