EXPOL StyroDrain for Retaining Walls

Made from 100% recycled, lightweight expanded polystyrene foam (EPS), EXPOL StyroDrain provides protection and drainage when used in retaining wall cavities.

The permeable nature of EXPOL StyroDrain allows water to easily drain away from the retaining wall.  EXPOL StyroDrain provides excellent protection of the waterproof membrane of retaining walls.

Specifically designed for applications with limited access, EXPOL StyroDrain is easy to handle and quick to install.

Click to enlarge

IDEAL USES

RETAINING WALLS

EXPOL StyroDrain is a lightweight alternative solution to retaining wall drainage.  The expanded polystyrene sheets also protect the waterproof membrane from damage from backfill material.  A double layer of EXPOL StyroDrain may be required if the retaining wall is higher than 1.2 metres.

EXPOL supply EXPOL-X and EXPOL ThermaSlab for protection and insulation of retaining walls.

MORE ABOUT EXPOL STYRODRAIN

EXPOL StyroDrain is made from recycled expanded polystyrene (EPS) and provides drainage as well as protection to the waterproofing membrane when used in retaining walls.

Lightweight and permeable, water easily migrates through the lightly fused polystyrene sheets, flowing down to drain coils and away from the wall.

EXPOL StyroDrain comes in easy to handle sheets and is easy to cut with a sharp knife or handsaw.

Use EXPOL ThermaSlab insulation board if gravel or scoria is being used for drainage.

SYSTEM COMPONENTS

CONSTRUCTION ADHESIVE 

System-components.jpg

EXPOL supply a water-based glue to adhere polystyrene to most surfaces. EXPOL retaining wall insulation is glued in place using this adhesive or can be used in combination with other fixing methods.

 

HOW MUCH DO I NEED

CHOOSING THE RIGHT PRODUCT

EXPOL StyroDrain is easy to cut and comes in easy to handle sheets 90mm thick.

CALCULATING HOW MUCH PRODUCT YOU NEED

EXPOL-StyroDrain-Retaining-Wall-Insulation-table-2.jpg

INSTALLATION INSTRUCTIONS

EXPOL makes drainage easy.  To ensure you get the best result, follow these simple steps.

Place EXPOL StyroDrain polystyrene sheets hard up against the retaining wall after the water proofing membrane or tanking has been applied. Use EXPOL Construction Adhesive to secure the EXPOL StyroDrain sheets in place while backfilling.

drainage_board.jpg

Place the sheets of EXPOL StyroDrain on top of a 100mm perforated drain.  Ensure the perforated drain is surrounded by drainage gravel and situated at the base of the retaining wall. On high reach retaining walls, it may be necessary to use a double thickness of EXPOL StyroDrain along the base of the wall to allow for increased compression and better drainage.

EXPOL StyroDrain should cover all of the waterproofing membrane and tanking areas. EXPOL StyroDrain sheets should not be exposed at the top of the wall.

FREQUENTLY ASKED QUESTIONS

How does EXPOL StyroDrain provide drainage?

Expanded polystyrene is lightly fused together allowing water to easily migrate through the board. Water flows to the drain coil and away from the wall.

What size does EXPOL StyroDrain come in?

EXPOL StyroDrain comes in 90mm thick sheets.  The polystyrene boards are easy to cut with a sharp knife or handsaw.

How does EXPOL StyroDrain differ from using scoria?

EXPOL StyroDrain is specifically designed for situations where access is limited.  EXPOL StyroDrain also provides protection to the waterproof membrane.

Does EXPOL StyroDrain help with insulation?

For exterior insulation of retaining walls, use EXPOL-X.

Technical information

EXPOL-StyroDrain-Retaining-Wall-Insulation-table.jpg

Test Results:

styrodrain-test-reuslts-table-1.jpg

General:

To assist in understanding of the results the following is a classification of a soil according to Permeability

styrodrain-test-reuslts-table-2.jpg

Coefficient of permeability (m/s)

styrodrain-test-reuslts-table-3.jpg

WHERE TO BUY

EXPOL products are available at a number of leading building products stores. Find your nearest stockist here.

View Expol Distributors in a larger map

Other Expol Retaining Wall products which may be of interest

EXPOL ThermaSlab S Grade

EXPOL-X

Fast Facts
  • EXPOL StyroDrain is ideally suited to situations where access to the retaining wall is limited or difficult.
  • A lightweight polystyrene board, EXPOL StyroDrain is easy to handle and easy to cut.
  • EXPOL StyroDrain allows water to easily migrate through the board and away from the retaining wall.
  • Use EXPOL StyroDrain as an alternative to scoria or gravel.
  • EXPOL supply EXPOL ThermaSlab for the protection of retaining walls where scoria is used and EXPOL-X for insulation protection.

R-Value Calculator

Sheet Calculator

Area to be insulated

Product Size Required

  • Branz
  • Testing
  • Masterspec
  • Other
Click here

General
Enquiry Form

General Enquiry

Tel: +64 (9) 634 3449

Free Phone: 0800 86 33 73

sales@expol.co.nz

105 Captain Springs Rd., Onehunga, Auckland

Tel: +64 (9) 634 3449

Free Phone: 0800 86 33 73

sales@expol.co.nz

105 Captain Springs Rd., Onehunga, Auckland

Thank you for visiting Expol. To view the site please upgrade to the latest version of Internet Explorer, Chrome or Firefox.

Links to update your browser:

Internet Explorer - http://windows.microsoft.com/en-NZ/internet-explorer/download-ie

Chrome - https://www.google.com/chrome/browser/features.html

Firefox - https://support.mozilla.org/en-US/kb/update-firefox-latest-version