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.
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Retaining Wall Insulation products.
View our short video highlighting the main products used when building 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.
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 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.
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.
To assist in understanding of the results the following is a classification of a soil according to Permeability
Coefficient of permeability (m/s)
WHERE TO BUY
EXPOL products are available at a number of leading building products stores. Find your nearest stockist here.