Honeycomb Drainage Cells — shallow geocellular for SuDS attenuation & infiltration

Near-surface storage, conveyance and load distribution beneath permeable pavements and landscapes—cut excavation depth and manage runoff on SuDS and blue-green roof schemes.

Reduce build-up depth & truck movements vs. aggregate sub-bases while keeping pavements traffic-rated.
Control runoff at source with high void ratio modules that detain, infiltrate or wick water to planting.
Fast, modular build — interlocks in eight directions; stack up to twenty layers for shallow or deep envelopes.

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Benefits Of Shallow Geocellular Cells For SuDS Attenuation & Permeable Paving

Near-surface geocellular modules that replace deep aggregate sub-bases, carry traffic loads and control runoff at source with high void ratio and proven flow performance.

Structural capacity

Traffic-rated capacity — Vertical ≥800 kN/m² (max ~1,330 kN/m²) and lateral ≥200 kN/m² (max ~400 kN/m²) with correct cover and confinement.

Fast assembly

Fast, secure installation — 8-direction build with 12 interlocks for positive locking; factory pre-panels ≥9 m² shorten programmes and QA.

Proven hydraulics

Proven hydraulics — >52% perforated intake and tested flow 50.2–94.2 L·s⁻¹·m⁻² (0–2% gradient) for reliable shallow conveyance.

Flexible stacking

Flexible stack design — height extenders and lap pieces enable stacks up to 20 layers for shallow or deep envelopes.

Honeycomb Cell Product Family & Accessories

Main module

shallow honeycomb drainage cell module with 95% void ratio for stormwater attenuation

PP geocellular unit (2.05 kg, 577 × 500 × 82 mm) with 95% void ratio and >52% perforation for rapid intake and through-flow.

Components

Drainage cell accessories including lap pieces and vertical patches for edge finishing

Upper/lower lap pieces, horizontal & vertical patches, and turning parts to form clean edges, corners and height transitions.

Interlocks

12-point clip-lock connectors ensuring shear continuity and structural stability for honeycomb rafts

12 interlocks per panel — positive vertical & horizontal locking for shear transfer and faster installation; 8-direction fit for complex layouts.

Pre-panels

Pre-assembled large drainage panels (≥9m²) for rapid installation on large podiums and car parks

Pre-assembled panels (≥9 m²) — factory-built mats delivered to site to reduce labour time and improve QA consistency.

Applications For SuDS, Permeable Paving & Blue-Green Infrastructure

Use the shallow geocellular layer as a load-bearing sub-base that can detain, infiltrate or convey runoff across roads, plazas, podiums, sports fields and green-roof schemes.

Shallow geocellular sub-base replacement under permeable paving for heavy traffic loads

Roads & heavy parking — shallow SuDS sub-base

Shallow geocellular raft (up to 95% void) replaces deep aggregate and detains / infiltrates / conveys runoff under traffic.

Blue-green roof drainage layer on podium deck enabling passive irrigation for vegetation

Roofs — podium decks & blue-green roofs

Lightweight roof sub-base that stores water and irrigates planting via passive capillary wicking—no pumps.

Load-bearing root protection system creating uncompacted soil volume for urban trees

Tree pits & root-friendly pavements

Load-bearing, ventilated raft that keeps pavements flat and delivers self-irrigation to healthy street trees.

Shallow subsurface drainage blanket under sports turf for rapid stormwater conveyance

Sports & turf — fast lateral through-flow

Lightweight, shallow sub-base giving uniform surface-wide drainage to keep pitches playable during storms.

Installation guide (shallow geocellular SuDS layer)

Infiltration (into subgrade), detention (lined), or blue-green roof with passive wicking.

Excavate
Excavate a shallow trench or raft to the design footprint, allowing for wrap and surface build-up. Keep sides neat for edge confinement..
Prepare the wrap (pick one)
Infiltration — line the excavation with permeable geotextile; lap joints to prevent soil ingress.
Detention / conveyance — install a watertight membrane (geomembrane); protect with fleece; form penetrations for inlets/outlets.
Assemble the raft
Place pre-assembled panels (≥ 9 m²) or modules; lock with 12 interlocks; the system builds in 8 directions to navigate corners and services. Connect inlets, outlets and inspection points.
Wrap, backfill & reinstate
Fold and seal the wrap; place protection/cover layers; reinstate the surface. Verify cover and edge confinement and record as-built photos.

Step-by-step installation of honeycomb drainage cells: excavation, geotextile lining, and module assembly

Technical data

Item	Value	Notes
Main module size	577 × 500 × 82 mm; 2.05 kg	Compact module for rapid handling and layout.
Void ratio / perforation	95% / >52%	High storage volume and rapid intake to the layer.
Vertical strength	≥800 kN/m² (max ~1,330 kN/m²)	Traffic-rated when installed with correct cover and confinement.
Lateral strength	≥200 kN/m² (max ~400 kN/m²)	Resists shear and spreads loads across the raft.
Layer discharge (0–2% gradient)	50.2 → 94.2 L·s⁻¹·m⁻²	Proven shallow conveyance across the panel layer.
Assembly	8 directions; 12 interlocks; 5 components; pre-panels ≥9 m²	Positive locking and fast installation; factory pre-panels available.
Stacking	Up to 20 layers (design-dependent)	Tune storage depth where excavation is limited.
Material / life	PP; long service life (creep extrapolation up to ~100 years)	Durable polypropylene for long-term performance.

Values are typical/indicative and must be verified for each project and traffic class.

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FAQ — Engineering & procurement

Why are HOENSOEY Cells hexagonal?

Hexagons tessellate without gaps, so panels sit side-by-side with no wasted space. The geometry gives near-isotropic load distribution, an efficient strength-to-weight ratio, and smooth edges for easy alignment.

Do HOENSOEY Cells need to be cut on site?

No. The system uses a five-part kit (main module plus lap pieces, horizontal/vertical patches and turning parts) that lets you build to almost any footprint without cutting the plastic. Only the wrap (geotextile or membrane) is trimmed.

Why can HOENSOEY Cells carry high loads?

Three things work together:
the cellular web with internal ribs spreads loads through the raft and into the cover;
interlocking connections confine the layer so it acts as a single unit;
high-quality PP material and geometry are optimised for stiffness and creep resistance.

What material are they made from? What is the service life?

Polypropylene (PP), designed for buried use. With correct design, cover and installation, creep testing indicates a long service life (up to ~100 years). Actual life depends on loading, temperature and site conditions.

How are HOENSOEY Cells installed?

Four steps:
excavate the shallow raft;
line with geotextile for infiltration or a waterproof membrane for detention;
place modules or factory pre-panels, engaging the 12 interlocks (buildable in eight directions) and connect inlets/inspection;
wrap, backfill and reinstate the surface.

How much can a crew install per day?

Rates depend on access, pre-panelisation and site logistics. Using pre-assembled panels typically shortens programmes significantly; confirm expected rates with your installer.

How are the products shipped?

By sea or land in containers (a 40-ft high-cube is usual). Panels nest efficiently for lower shipping volume.

What is the typical lead time?

Stock items can ship quickly; larger orders follow a production schedule. Confirm current lead times at quotation.

What surface finishes can go above the layer?

Most hard or soft finishes, including stone, block or tile paving, concrete or asphalt, permeable concrete, rubber, natural turf and artificial turf. For infiltration systems, use permeable finishes; for lined detention, impermeable finishes are fine.

Why is no power needed for irrigation on green roofs or green streets?

Add wicking strips above the cells to move stored water upwards by capillary action. Plant roots take up the moisture from the substrate, creating a passive, pump-free irrigation loop.

What related products are available?

Geotextiles, waterproof membranes and protection fleeces, wicking strips, inspection/access fittings and flow-control components. We can also source specified accessories on request.

Can the system be stacked?

Yes. The modules can be stacked in multiple layers (design-dependent) to tune storage within a shallow excavation.

What about hydraulics and flow?

The open geometry and perforations provide high intake and layer-flow performance for shallow conveyance. Your engineer will size the system to the project rainfall, soil and outlet conditions.

Is it compliant with SuDS practice?

The system is intended for source-control SuDS features (infiltration, detention, conveyance and blue-green roof build-ups). Final compliance depends on local guidance and the project’s civil design.

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