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PCB Design Rules

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Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. If you have many questions of PCB Design, please come here!

Community > Groups > PCB Design Rules > For a 4 layers PCB, is it necessary to cover with ground polygon on Layer 1&4 necessary?
For a 4 layers PCB, is it necessary to cover with ground polygon on Layer 1&4 necessary?
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Daniel Gilbert

I will cover all the empty spaces in the layout with Ground in simple single or doubled layer PCB. The stackup of my 4 layers PCB is as fllowing: Layer 1: top signal Layer 2: Ground plane Layer 3: Power plane Layer 4: bottom signal Since now I already got a dedicated Ground plane (Layer 2), my question is: After finished all the routing, for Layer 1 & 4, should I still cover all the emptied space with Ground as well?
Statement: This post is only the personal view of the author and does not represent the opinions of


Provide Ground Planes into the Top layer, and Bottom Layer is good. If you can't accommodate in the Top and Bottom layers, you need to make sure that you make a Top-Bottom Via which connects in the internal plane. This reduces the current return paths.


Yes, it is necessary if you can. It won't harm anyway.


You have a few obvious options with any of the supply rails, including ground, or nothing. Since you have a bunch of supply rails a power pour would get complex.

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