Install Tips

Undermount Sink Installation Methods

Stainless Steel Undermount Sinks

Cinclips® are installed underneath Granite, Marble, Concrete, Corian, Silestone, Quartz or Wood countertops.There are several ways to install undermount sinks. Most methods are no good. The method used generally depends on the way the installer was taught. Some installers prefer to drill clips or screw in brackets and some prefer the glue in method. Now there is a new, faster, better method; Cinclips®,a bracing system designed to never let you or your sink down! Let's look at your options.


Clips That Ship With Most Undermount Sinks

The clips that are shipped with most sinks are simply a strip of metal about an inch long with a hole in one end and a screw and anchor which is seated in the stone around the outside of the sink. These work well, but need to be installed at the shop and not in your home. The risk of using this type of clip is that if the fabricator is not experienced or does not have the proper equipment, the stone can crack or brake. The hole for the screw is drilled into the stone from the bottom about half way through to insert the plastic for the screw. The metal strip then extends over the edge of the sink and is tightened to hold the sink. There are about 9 of these clips around the outside of the sink which means 9 more holes part way through the stone which can crack during installation or at a later time. Replacement of the sink if damaged is nearly impossible. This type of installation also requires additional space around the outside of the sink for the clips which can limit the size of the sink that can fit into the cabinet and it might be next to impossible to tighten from below.


The Traditional Glue In Method

The most widely used method of installation is gluing the sink to the stone. This sounds like a poor way of securing the sink ,and it is!  It works ok for a while, then, without warning the sink falls down! This type of installation will require a two part epoxy that is used in the solid surface countertop industry to glue seams and stone together. The Installer/Plumber will put 100% silicon completely around the edge of the sink where the top lip of the sink will contact the stone. The silicon will also form the seal between the sink and the countertop. It is important that the Installer/Plumber use 100% silicon and not latex caulking. The latex will not hold. When glued in, the sink is then pulled up from underneath and held in place with clamps through the drain holes and a 2X4 across the countertop. In about 4 hours the clamps can be removed, but, the silicon, which is what really seals the sink, needs a full 24 hours to dry. Do not hang the garbage disposal on the sink during this time! Gravity takes its toll on the silicon after a while. Weeks to years, no one knows! For additional security often small pieces of stone, wood, or I've seen cardboard (about  are glued underneath the sink overlapping the edge of the sink and the stone. Below is a picture of an undermount sink that was installed some time ago without any mounting hardware. Only glue and a few small fragments of stone hold the sink up. These can let go at any time due to several factors; gravity, moisture, expansion and contraction due to heat from water and dishwashers and thus not recommended! See picture below to see one that failed! This should be a concern for homeowners and installers! This results in having a stone specialist or Plumber come out and remount the sink. This is an expense of $200.00 to $500.00 just for the sink, then there is the water damage and or the broken dishes and plumbing underneath the sink and a surprise most homeowners are unaware of .

Undermount Sink Brackets

There are also brackets available to installers that run from the front to the back of the cabinet before installation. These brackets also have screws in the brackets to hold the sink up against the stone from the bottom until the silicon sets. There are generally two of these per sink installation. They do require that the installer put two small notches in the front of the cabinet to hold the bracket, It takes one on the front and one on the rear of the cabinet ( per bracket) and requires special long screw driver to reach up to the screws. Also, the sink must be installed on the brackets before the countertop is installed. There is no center support to keep the sink from coming loose. This type of installation has its limits. No additional holes are required in the stone for this type of installation. This installation makes it really hard to replace the sink in case of damage.


Sandwiching The Sink Between Plywood And Stone

Installers who deck the cabinets with plywood underneath the stone often just clamp the edge of the sink between the decking and the stone. This is a simple installation, but the sink cannot be removed without taking the countertops off. This represents most all of the methods of installing stainless steel undermount sinks until now! Now there is a better way of mounting undermount sinks



Cinclips® is the easiest of all. They only take a few minutes to install and will not let your sink fail. If you need to replace the sink it is as easy as removing the clips and cutting the seal. All you need to do to install Cinclips® is clean off the top of the sink as well as the underneath of the countertop where the sink will contact and put a bead of 100% silicon around the top of the sink, temporarily mount sink to top by means of clamps and wood or tape. Then all you need to do is install five mounting braces and you can hook up the sink including the food disposal. Clean off any silicon that was pushed out by the mounts inside of sink. No wait time! This is also the best method of remounting a sink to insure it will never let the sink fall out! You may also retro these braces into the existing sink before it comes loose, although we recommend that you have it checked out by a plumber to make sure the seal is still good before using!


You can discuss this with your fabricator before installation to make sure he is going to use them for your sink. The metal clips described above generally ship with the sink. The brackets do not and will have to be purchased separately, the same with Cinclips®. Do not let the installer just glue the sink in, Make sure they use Cinclips®. They should provide everything that is necessary for a proper installation that wont fail! Ask your fabricator if they warrant the installation of your sink! . Use Cinclips®, they will never let you or your sink down!

Ordering Cinclips®

Cinclips® are mounting brackets for undermount sinks. they are sold in a package of five. We believe there is not a product out there that can support a sink as well as Cinclips® can. We offer an excellent product at an affordable price. Cinclips® LLC. You can place your order by using our contact form and enter the following information: First name, last name Company address, E-mail address, Phone number (for callback), Delivery address ,Billing address (if different from delivery address) Payment method: (Paypal, Check, Money Order, COD, and all major credit cards. See our contact form).  Quanity of product you would like to order.