Plywood Thickness Under Granite Countertop

I ve seem people saying that a plywood backer is important and some other people saying that it is more trouble than it is worth and the cabinets provide.

Plywood thickness under granite countertop.

Set granite in place for the sink counter and trace the exact line around the opening for the sink onto the plywood subcounter. Ultimately they will be stronger and more refined. Make it about 1 8 larger than the line you drew. 3cm material can go directly on top of the cabinets without the need for plywood support.

The average thickness of plywood sheets used for backer on counter tops is 3 4 inch. Typically this support includes a plywood base and an underlayment of cement board. I will have the following run of cabinets which will be screwed together and to the back wall and will install a 20mm 3 4 thick granite countertop over it with sink and cooktop range. 6 cm thick granite countertops.

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. Forum responses cabinet and millwork installation forum from contributor k. 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. However for granite with a thickness of 2 centimeters about 3 4 inches you will definitely need to use plywood for support.

Use a spade bit to make a pilot hole in the plywood and use a jigsaw to cut the sink hole. Depending on thickness granite countertops may be self supporting without underlayment. It offers the most durability size flexibility and color options. Their 33 extra thickness means you do not need plywood under your granite countertops or extra lamination.

This provides adequate support for a wide range of finish materials. There is no plywood under the granite. Drop in the sink. Granite countertops can come in different thicknesses but the preferred thickness is three centimeters or almost 1 1 4 inch.

Remove the granite slabs that were dry fitted only. If using plywood merely as a framework for the finish work surface to be adhered to inch thick plywood is recommended for strength. You need to have a subtop to glue the granite to. 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.

For a truly eye popping countertop many homeowners stack two slabs of 3 cm granite to create the mastadon.