Expol Styro-Drain
Expanded Polystyrene Drainage Board from Expol
- Styro-drain is manufactured from 100% recycled material
- Styro-drain is a light weight drainage material which also offers protection to the water proofing membrane on retaining walls
- Styro-drain comes in easy to handle sheets 1800 x 1200 x 90mm and can be easily cut with a sharp knife or hand saw
- Styro-drain can be transported on light trailers and utilities
INSTALLATION INSTRUCTIONS
Expol Styro-drain polystyrene drainage board can be placed
hard up against the retaining wall after the water proofing
membrane or tanking has been applied, use Expol Construction
adhesive to secure the sheets to the wall before back filling.
The sheets of Styro-drain are placed on top of IOOmm perforated drain surrounded by drainage gravel situated at the base of the retaining wall. On high reach retaining walls a double thickness of Styro-drain along the base of the wall may be required allow for increased compression and better drainage.
Expol Styro-drain should cover all waterproofing membrane and tanking, the sheets of Styro-drain should not be exposed at the top of the wall. Styro-drain has been tested by Opus International Consultants Ltd. OPUS INTERNATIONAL CONSULTANTS Job No. 169402.00 Reference No. 02/402/001 Permeability Tests: EXPOL STYRO-DRAIN Test Methods: Permeability as per "Constant Head Permeability of Aggregate, Based on Soil Laboratory Testing by E.H.Head, Density by Mass/Volume calculation.
Test Results:
| Sample | Head (mm) | Hydraulic Gradient (i) |
Density (kg/m3 |
Permeability (m/s) |
| 1 | 34 | 0.33 | 11.1 | 4.13 x 10–3 |
| 2 | 34 | 0.33 | 11.3 | 4.30 x 10–3 |
| 3 | 33 | 0.32 | 10.8 | 4.12 x 10–3 |
| Average | 0.33 | 11.1 | 4.18 x 10–3 |
General:
To assist in understanding of the results the following
is a classification of a soil according to Permeability
| Degree of Permeability | Range of Coefficient of permeability (k) (m/s) |
High |
Greater than 10–3 |
Medium |
10–3 - 10–5 |
Low |
10–5 - 10–7 |
Very Low |
10–7 - 10–9 |
Practically Impermeable |
Less than 10–9 |
Coefficient of permeability (m/s)
| k = | 1 | 10–1 | 10–2 | 10–3 | 10–4 | 10–5 | 10–6 | 10–7 | 10–8 | 10–9 | 10–10 | 10–11 | 10–12 |
| Drainage Characteristics |
Good | Poor | Practically Impervious | ||||||||||
| Permeability Classification |
High | Medium | Low | Very Low | Practically Impermeable | ||||||||
| General soil type | Gravels | Clean Sands | Fissured & weathered clays | Intact Clays |
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| Clean Sands | Very Fine or silty sands | ||||||||||||
