Hi,

 Can anyone suggest a technique that provides a 7 layer though hole yet the
net is insulated from PCB bottom of an 8 layer board?

 I have an 8 layer board where the customer wants a large copper coated GND
section on the bottom (layer 8). There are through holes everywhere as this
is a fairly dense board. The customer does not want vias or barrels exposed
on this bottom side in the GND section YET there are many other routes and
vias in other section of the bottom (layer 8).

 When I suggested an insulating layer of plastic film the customer would
rather pay more money for the PCB and not bother with the application of the
insulator.

Any suggestion?

Thanks,
Bob K.


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