Is it really worth the risk?

Non-compliance could cost someone big dollars! Don't let it be you!


Ask to see the footing design report before commencing any drainage project and if flexible connections are specified in the stormwater and sewer drainage section, comply with the recommendations.

Expanda Joints ensure fast effective repair incorporating provision for soil movement, thereby preventing future damage. These high performance, low cost fittings have been the key to success for Storm Plastics. This flexible fitting was developed at a time when engineers had been looking to solve problems caused by expansive soils. The Expanda Joint adequately satisfies engineers' requirements. It is manufactured to tolerances that ensure maximum seal when installed correctly and is designed not to pull apart. Soil movement of up to 150mm is accommodated by the 100mm DWV fitting and the 90mm Stormwater fitting accommodates up to 90mm of soil movement.
Flexible Joints are currently being called up in Footings Specifications by consulting engineers to the building trade, in an effort to reduce the likelihood of structural damage in reactive clay sites. It is now mandatory that flexible joints are installed in all sewer and stormwater drains in reactive soils. Expanda Joints may be installed vertically or horizontally in soils up to ?E? classification and have been designed as flexible couplings in keeping with the requirement of AS 2870-1996.5.4(b). Connection of stormwater drains and waste drains shall include FLEXIBLE CONNECTIONS on reactive sites classified as ?H? or ?E?.
The 100mm DWV Expanda Joint is manufactured to comply with AS/NZS 1260. It has been tested at a registered NATA Laboratory and has been authorised by the relevant authorities throughout Australia.
The 90mm Stormwater Expanda Joint has passed similar tests, but comes under local government/council jurisdiction.


Important Advice
The Expanda Joint, being a flexible fitting, does need extra care and attention for maximum performance. Installation instructions on the fitting should be followed.
During development of the Expanda Joint, it was found that the 100mm fitting, if left in a completely closed position, was very difficult to release. Hence the cardboard spacer that is easily removed by pulling one end of the spacer until it is out of the fitting. The rubber ring seal below the cap grips so tightly on the pipe that physical pressure is insufficient to release the seal when the fitting is completely closed. However, the contractor may be assured that once the fitting is installed underground, earth movement, which is great enough to break solvent cement joints, will certainly expand and contract the Expanda Joint as necessary. Before use, the spacer should always be left in the fitting. If the spacer has been removed, however, the fitting should be stored open at least 20mm. To release the seal and prepare the fitting for use, one should not be afraid to treat the fitting harshly. One can simply remove the spacer, upturn the fitting and push sharply downwards, or alternatively ?stomp? on it. Once the seal has been released, the fitting becomes pliable for use. The Stormwater Expanda Joint should be treated similarly, but will be found to be a little easier to manoeuvre.


Advantages for DWV Application
The pipe and socket of the Expanda Joint are moulded to tolerances that ensure maximum seal is attained (unlike the elastic band, clamp and slip socket methods).
Only one Expanda Joint is required, therefore the time saved on installation pays for the fitting.
Use of the Expanda Joint achieves a permanent repair and incorporates allowance for future soil movement. The Expanda Joint can withstand more downward pressure than PVC pipe and permits relative longitudinal movement of the pipework system when subjected to expansion and contraction due to temperature change or soil movement.
Expanda Joints are easy to install in confined space.
The fittings are designed to resist penetration by roots. 100mm Expanda Joints are assembled using a 7mm face rubber ring seal which is manufactured in accordance with AS 1646 and the snap-on cap has been designed primarily to deter root intrusion.


Tension Free Sewer Pipe Systems
One of the key objectives in designing, engineering and installing a sewer pipe system is to minimize tension on the system.

The SWIVEL JOINT is capable of being angled in all directions by up to 15 degrees from its axis. When coupled with Storm Plastics EXPANDA JOINT it provides the Engineer with the means to design a tension free system more easily.

The SWIVEL JOINT adds to the range of specialised plumbing fittings available from Storm Plastics (SA) Pty Ltd and has been tested and approved for use in Europe and South Australia. S.A test cert. No. LR18.

The 100mm SWIVEL JOINT can extend 50mm and the 150mm SWIVEL JOINT can extend 60mm, thereby compensating for soil movement.


Soil Classifications


 AS 2870-2011 Ref Table SP-1


A - Moist Sand & Rock Sites   0 mm


S - Slightly Reactive Soils  0 - 20 mm


M - Moderately Reactive Soils  20 - 40 mm


H1 - Highly Reactive Soils  40 - 60 mm


H2 - Very Reactive Soils  60 - 75 mm


E - Extremely Reactive Soils  75 mm  +


P - Soils Affected By Abnormal Moisture Conditions


P2 - Uncontrolled Fill, Soft Soils or Collapsing Soils

Beware of Sodic Soils


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