Thickness Of Plywood Under Granite Countertop

This will prevent it from cracking when there are larger.

Thickness of plywood under granite countertop.

Drop in the sink. Three centimeters is the preferred thickness for both quartz and granite countertops for most countertop fabricators designers and architects. However for granite with a thickness of 2 centimeters about 3 4 inches you will definitely need to use plywood for support. Typically this support includes a plywood base and an underlayment of cement board.

You can use it as a stand alone product as well as a finish type plywood if it has a laminate finish that you can paint or finish according to personal preference. Using proper materials and techniques ensures a reliable long lasting countertop. It offers the most durability size flexibility and color options. Set granite in place for the sink counter and trace the exact line around the opening for the sink onto the plywood subcounter.

When installing granite countertops you will not need an underlayment of plywood if the granite has a thickness of 3 centimeters about 1 1 4 inches. For a truly eye popping countertop many homeowners stack two slabs of 3 cm granite to create the mastadon. Use a spade bit to make a pilot hole in the plywood and use a jigsaw to cut the sink hole. Nearly all stones are found in this size and the slabs can be as large as 105 by 54 inches.

The average thickness of plywood sheets used for backer on counter tops is 3 4 inch. This provides adequate support for a wide range of finish materials. There is no plywood under the granite. You need to have a subtop to glue the granite to.

If using plywood merely as a framework for the finish work surface to be adhered to inch thick plywood is recommended for strength. 3cm material can go directly on top of the cabinets without the need for plywood support. 6 cm thick granite countertops. Make it about 1 8 larger than the line you drew.

Remove the granite slabs that were dry fitted only. Strips of the same type of plywood cut to 4 inch widths should be glued or screwed to the edges of the countertop to strengthen this area making it twice as thick as the rest of the countertop. Ultimately they will be stronger and more refined. The most commonly found granite countertop thickness is 3 cm or 1 1 4 inches.

Forum responses cabinet and millwork installation forum from contributor k. Depending on thickness granite countertops may be self supporting without underlayment.