JES25 is the 25 mm high-flow model in the JES HDPE dimpled drainage sheet range. Each roll measures 1,700 × 17,650 mm and has a listed vertical circulation capacity of at least 13.5 cm³/s. The deeper profile is intended for projects that need a continuous drainage cavity across roofs, landscaped slabs, walls or tunnels, subject to the engineer’s complete waterproofing and drainage design.
What Distinguishes JES25?
JES25 has the greatest height, weight, listed vertical flow, bending strength, puncture strength and elongation value among the three legacy JES models. JES15 offers the highest listed pressure strength, while JES20 provides an intermediate 20 mm profile. Therefore, model selection should balance drainage capacity and mechanical requirements instead of assuming the tallest sheet is always the best choice.
JES25 Technical Data
| Property | JES25 Value |
|---|---|
| Roll size | 1,700 × 17,650 mm |
| Dimple height | 25 mm |
| Material | HDPE |
| Weight | 1,200 g/m² |
| Pressure strength | ≥250 kPa |
| Bending strength | ≥400 N/5 cm |
| Vertical circulation capacity | ≥13.5 cm³/s |
| Puncture strength | ≥420 N |
| Elongation at break | 45% |
Typical Applications
- Green roof and roof-garden drainage layers
- Landscaped podiums and top slabs
- Basement or retaining-wall protection and drainage
- Road, utility and below-grade tunnel drainage
The drainage sheet creates a flow cavity but is not itself the waterproofing membrane. Use it with the project-specified waterproofing, protection, filter and termination layers. For complete planted trays rather than a roll drainage layer, see our green roof tray system.
Installation Guidance
Prepare and protect the waterproofed substrate before rolling out JES25. Orient the dimples and flow paths according to the approved detail, form secure laps, and terminate edges so soil or debris cannot enter the cavity. Keep roof and podium outlets accessible. On vertical walls or tunnels, coordinate fixing positions so waterproofing penetrations are minimized and properly detailed.
Production and Enquiry
Send the application section, installation area, required drainage capacity, loading and destination to our project team. Final selection should be approved within the project’s waterproofing and drainage design.