How Big is the Pipework and Can it be Concealed?

The external diameter of most flameproof cpvc pipework in domestic premises is either 28mm or 35mm. The way up through a house is frequently identical to the route of the soil stack. When the pipework runs perpendicular to the joists, the joists will be drilled on the centre line between 0.25 and 0.4 of the joist span. Another advantage of installing a High Pressure Mist System is that the holes are considerably smaller – generally less than 25mm in diameter.