BIOKIL 8mm Meshed Cavity Drain Membrane – Waterproof Plaster-Ready Tanking Membrane (2m x 20m)

The Biokil 8mm Meshed Membrane is a high-performance waterproof cavity drain membrane with a bonded mesh surface, specifically designed for internal basement waterproofing and damp-proofing applications. Ideal for retaining walls, vaulted soffits, and curved surfaces, this membrane provides a reliable waterproof barrier while offering an excellent key for plastering, rendering, or dot-and-dab dry lining systems.

Manufactured from durable HDPE with a welded mesh finish, the membrane forms part of a Type C waterproofing system compliant with BS8102:2009, allowing moisture to be controlled and safely managed. The bonded mesh is securely welded during manufacturing to prevent separation and ensure long-term performance.

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Key Features & Benefits

• High-performance bonded mesh – ideal for plastering and rendering applications
• 8mm cavity drain system – improves moisture management and drainage
• Type C waterproofing compliant – in line with BS8102:2009
• Designed for basements and retaining walls – suitable for below-ground structures
• Perfect for vaulted soffits and curved walls – where dry lining systems may not be practical
• Waterproof, salt inhibiting – protects against moisture and salt contamination
• Root and contaminant resistant – suitable for demanding environments
• Quick installation – minimal surface preparation required
• No drying time – redecoration can begin immediately
• Flexible and durable – easily folds around corners and openings

Typical Applications

• Basement waterproofing systems
• Retaining walls
• Vaulted soffits and curved walls
• Above and below ground waterproofing
• Damp-proofing and tanking systems
• Plastering and rendering applications

How the System Works

The studded membrane creates a cavity between the substrate and the finished surface, allowing moisture to pass behind the membrane and be safely managed through a drainage system.

The bonded mesh surface provides a strong mechanical key, enabling plaster, render, or dry lining systems to be applied directly to the membrane without additional preparation layers. :contentReference[oaicite:0]{index=0}

Installation Overview

• Install with studs facing the wall
• Drill through the centre of each stud
• Fix using Biokil Plaster Plugs (50mm, 60mm, or 70mm)
• For below-ground applications, use plugs with seals
• Fixings should be spaced at 250–300mm centres
• Ensure tight fixing around corners and junctions
• Do not apply to flat soffits below ground without a minimum 10% slope

Surface Preparation

Remove all unsound plaster, render, or screed and ensure surfaces are level before installation. Use a suitable 3:1 sand-cement mix with additive to repair uneven areas and allow repairs to dry thoroughly.

Where mould or fungal contamination is present, treat the surface using a suitable masonry biocide before installation. For above-ground applications, moisture should be addressed at source using a suitable damp proof course such as Biokil BioDry ProCream.

Finishing Options

Plaster Finish: Apply plaster directly to the bonded mesh surface using standard plastering techniques in accordance with BS 5492:1990. A lightweight plaster such as Tarmac Whitewall One Coat Plaster is recommended.

The first coat should fill the studs and cover the mesh to create a scratch finish. Once set, apply a second coat to achieve a final thickness of approximately 15mm.

Dry Lining: Apply bonding plaster dabs with a minimum thickness of 8mm, ensuring at least 50% membrane coverage before fixing plasterboard.

Once dry, surfaces can be decorated immediately using conventional methods such as painting or wallpapering.

Aftercare & Ventilation

The membrane creates a dry and habitable internal environment; however, effective condensation control remains essential, especially in basements and moisture-prone areas.

Mechanical ventilation systems are recommended to maintain airflow and reduce condensation build-up.

Technical Specifications

Feature	Specification	Test Standard
Material	HDPE	-
Unit Weight	0.505kg/m²	-
Sheet Thickness	0.7mm	EN 149-2
Stud Height	3mm	-
Working Temperature	-50°C to +80°C	-
Water Vapour Resistance	High	BS EN 1931:2000
Tensile Strength (MD/CD)	416N / 488N	BS 12311-2
Resistance to Static Loading	>20kg	BS 12730
Reaction to Fire	Class F	BS EN 13501-1
Life Expectancy	Lifetime of structure	-

Available Size

• 2m x 20m – 40m² coverage

Why Choose Biokil 8mm Meshed Membrane?

This membrane combines high-capacity cavity drainage with a plaster-ready mesh finish, making it ideal for waterproofing projects where traditional dry lining systems may not be suitable.

Its flexibility, durability, and ease of finishing make it a professional-grade solution for basements, retaining walls, vaulted soffits, and damp-proofing projects.