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<strong>The</strong> vent pipe is added through the roof hole and then placed in the vent hole<br />
in the slab. A weak cement mortar is laid around the vent on the roof.<br />
In this case a resin filled hessian pipe has been used. PVC pipe is the most<br />
common. <strong>The</strong> diameter should be 110mm. <strong>The</strong> pipe is held fast in the slab<br />
using a little cement mortar. <strong>The</strong> pipe must be fitted with a corrosion resistant<br />
fly screen made from like aluminium or stainless steel.<br />
Plastering the floor<br />
<strong>The</strong> floor is plastered with a strong mix of river sand and Portland cement<br />
and is sloped downwards towards the squat hole from the entrance.<br />
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