NZ Certifying Drainlayer case studies
NZ Certifying Drainlayer · Put your knowledge to work in context.
The Certifying Drainlayer is a New Zealand licensing class administered by the Plumbers, Gasfitters and Drainlayers Board. It sits above the standard registered drainlayer class: a certifying drainlayer is authorised to certify that drainage work they have personally carried out complies with the New Zealand Building Code and the cited standards, so that building consent authorities can accept that certification instead of inspecting every element. The NZ Certifying Drainlayer case studies are 5 cases and about 2,647 words.
1Available fall short on a consented 100 mm drain
A building consent has been granted for a 12 m extension of a 100 mm uPVC foul drain serving a new bathroom group. The existing drain invert at the connection point is fixed.
573 words, about 3 min2Deep trench in sandy fill beside a boundary fence
On a sloping site, a 2.4 m deep trench is open for a 150 mm main drain. The ground is loose sandy fill over firm clay; groundwater seeps at about 1.8 m and the trench wall is slumping near a neighbouring fence 1.5 m away.
543 words, about 3 min3Air test loses pressure before the driveway pour
60 m of new 100 mm uPVC foul drain has been laid at 1:60 and backfilled except for a 3 m section under a driveway crossing. An air test on the whole run holds initially but loses pressure slowly; the joints are solvent-cemented.
503 words, about 3 min4Café grease trap and stormwater discharge proposal
A 140-seat café is fitting out in an existing building. The only drainage connection is a 100 mm foul drain to the public main; the council trade waste bylaw requires pre-treatment for FOG and a sampling point, with annual desludging.
517 words, about 3 min5Unsupervised lateral, unlocated service and a flat grade
Your company is installing drainage on a residential subdivision. A labourer with no drainlaying qualification is laying 100 mm laterals while the site supervisor is off site.
511 words, about 3 min