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Bath & Faucets

How to Install a granite vanity top

I'd like to replace my existing bathroom vanity top with a granite one.  What's the best way to remove the existing top & how do you install a granite top?  Also, need to remove/replace the back & side splash bars. Thanks

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Posted 2012-04-17T00:13:30+0000  by gwtusa gwtusa

Hello gwtusa and thank you for joining The Community!  We are glad that you are here.


Congratulations on tackling the vanity top project.


Tools you will need

  • Adjustable wrench
  • Bucket
  • Drop cloth
  • Flashlight
  • Gloves
  • Hammer
  • Medium pipe wrench
  • Plumber’s putty
  • Putty knife
  • Rags
  • Safety glasses
  • Silicone caulk or construction adhesive
  • Screwdriver
  • Teflon tape
  • Utility knife


Removing the existing countertop


1. Remove the faucet


Spread out dropcloths to protect the floor.  Remove the contents from inside the cabinet.  Wear safety glasses.


Check out our How to Replace Sink Faucets video for step-by-step instructions on how to remove the faucet.   Open the vanity and turn off the water at the shutoff valves near the bottom of the cabinet.  Turn on the faucets to release any water pressure from the lines.  Disconnect the drain plug linkage and use an adjustable wrench to disconnect the hot and cold supply. Use a basin wrench to loosen the nuts below the sink to loosen the faucet assembly.  Remove the faucet.


2. Remove the old countertop and sink

Depending upon your existing sink, it may be removed by unscrewing it from the countertop.  An integral or glued sink will be removed as part of the countertop.


Look inside the vanity to see where the countertop meets the walls. Your countertop may have been glued onto or screwed into the vanity.  If you see brackets holding the countertop in place, unscrew to release the countertop. 


If your countertop was glued, use a utility knife and/or a putty knife to create a space between the countertop and the vanity.  Be careful not to damage the top edges of the vanity. Use the same technique to break the joints between the wall and the backsplash and sidesplashes.


Once the countertop is loosened, lift it off of the vanity.  Use a helper if the top is heavy or long.


Clean the top of the vanity surface by removing the glue adhesive by gently scraping and sanding as needed. 


Fix the wall if it was damaged during the countertop removal process.



Installing a new countertop


3. Install a new granite countertop (sink optional)

If you are installing a Pegasus or Solique granite countertop from The Home Depot, be sure to follow the installation instructions provided.  If your sink is not integral or a part of the countertop, follow the manufacturer’s instructions to attach the sink to the countertop.


In general, you will need to apply a bead of clear silicone caulk or heavy duty construction adhesive to the underside of the new countertop and carefully place it on the vanity top.  Using a helper is a help!  Check for straight edges and level – once this countertop “sets,” it will stay that way. 


“Weigh” the top down onto the vanity (we use encyclopedias and large telephone books) to create a good bond.  Leave overnight.


Apply a bead of clear silicone caulk or heavy duty construction adhesive to the bottom and appropriate sides of the backsplash and sidesplashes.  Position straight and level and allow a good bond to form.


4. Install a faucet

You can either reuse the old faucet or install a new one ; the  video referenced above will show how to install a new faucet.  Follow the manufacturer’s instructions for proper installation.  Use plumber’s putty or clear silicone around the bottom of the faucet to create a watertight installation.  Use plumber’s putty around the pop-up of the drain.  Allow several hours to set.   


Reconnect the water supply line.  Apply Teflon tape to the threads of the tail pieces of the faucet assembly.  Connect the hot and cold water supply lines and tighten.  Connect the drain pipe linkage system.  Turn the water back on.  Check for leaks.


5. Maintenance issues

Your countertop manufacturer should recommend the best products for sealing your new granite countertop as well as any special cleaners to keep it looking great.


Best wishes on your project! 



Posted 2012-04-17T22:13:55+0000  by Eileen_HD_ATL
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