"Tony Hayes" wrote in message
...
My neighbour is laying the floor in his new bungalow - 4 inch thick
polystyrene insulation sheets covered with chipboard tongue and groove.
He
intends running plastic central heating pipes under the floor and is
looking
for the best way of cutting channels in the insulation to take the piping.

Any ideas gratefully received and passed on.

Thanks,
Tony

A circular saw will cut a groove to the depth required and a few passes will
provide the desired width.

Richard.