Soil Heave – Protecting the Slab

Protecting slab Stage 1

There has been a lot of talk in the Melbourne papers recently about ‘Slab Heave’ when Building on Clay so I thought I would explain how to minimise the risk during construction.

A key issue when building on clay is to avoid any extra moisture getting into the clay under the slab. causing the clay [read more...]

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Onsite Stormwater Dention – Why

flooding

If you want to redevelop or subdivide an existing urban block, you might find that a planning condition is that you will need to provide On-site Stormwater Detention (OSD).

You may also find it is a condition on individual blocks on smaller subdivisions.

Why Is Onsite Stormwater Detention Needed?

Before development of towns and cities [read more...]

Stormwater – Kerb Discharge

Stormwater Outlet - kerb

If you are going to build on an existing block you will probably have a planning permit condition that stormwater must discharge to an approved point.

If there is no surface water system one option can be to discharge to the street.

This is normally by constructing a proper kerb outlet like the photo below:

[read more...]

Plumbing Acronyms

There are a lot of acronyms used on plumbing drawings so here are a few definitions:

AG – Agricultural (Drains)

B – Basin

Bth – Bath

BT – Boundary Trap

DP – Down Pipe

FW – Floor Waste

HWS – Hot [read more...]

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Protecting Underground Pipes

impact cutter

One of the problems that happen all too often during a new house build is that Sewers and Drains get filled with concrete.

Its normally happens on:

A knock down and rebuild project where the sewer connection wasn’t sealed during demolition. A Battle Axe block subdivision where the new home is built close to the [read more...]

Charged Drainage System

Charged  Drainage

Thanks to SaveH2O, of Supadiverta

This diagram indicates a charged drainage system. These are sometimes called either a “wet” or a “pressure” system.

With this type of system a section of the pipe always remains full unlike a Conventional System.

As the pipes are under pressure it is essential all the joints [read more...]

Conventional Drainage

Conventional Drainage

The vast majority of new houses will have a conventional (sometimes called a Gravity, or Open system) storm water drainage system discharging to either:

Public Surface Water Drain – Typically in Eastern States Soakwells on Sandy Sites – Mainly in WA

 

With a conventional system like this the pipes are either vertical or [read more...]

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Underground Pipes

DIGITAL CAMERA

It’s important to make sure you are getting the right type of pipes and fittings that will be underground…..you don’t want to be digging them up in case of blockages.

Pipes

Some plumbers will want to use and bury 90 mm diameter rainwater pipes, basically plastic downpipes.

You need to make sure you are getting [read more...]