There are two ways of creating underground ducts for cables, water pipes, heating, etc. in KERATERM blockwork.

Firstly, by using a diamond cutter, which is designed for such work.

The second method, or “economic” method, when there is no masonry cutter, is to make the channels with a hand-held angle grinder using a diamond segmental cutting wheel.

The following procedure is to be followed: using a masonry router or angle grinder, and adjusting the required depth of the channel, saw the boundaries of the next channel, forming two cut lines, then accurately chisel out the middle part of the channel. In the forging process, hand tools – hammer and chisel – are preferred.