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DIY Refurb

20mm Stud Membrane - Black - Biokil Crown - High-Capacity Cavity Drainage Membrane

20mm Stud Membrane - Black - Biokil Crown - High-Capacity Cavity Drainage Membrane

SKU: CDM20220
EST Delivery Date Est Delivery between 6th Feb and 12th Feb.
£245.70 £294.84
£245.70 £294.84 £0.00
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Based on your total area of 0m2 (inc. 10% wastage) you will need 1 of this product (total coverage ).
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Product Information

Biokil Crown 20mm Stud Membrane – Black

High-Capacity Cavity Drainage Membrane for Basement Floors and Ground-Bearing Slabs

Biokil Crown 20mm Stud Membrane – Black is a heavy-duty, high-capacity cavity drainage membrane designed for use on basement floors, raft foundations, and ground-bearing slabs where maximum drainage and water movement is required. Manufactured from high-density polyethylene (HDPE), the 20mm stud profile creates a large drainage void beneath floor finishes, directing water to internal drainage systems or sumps as part of a Type C waterproofing solution.

Key Features & Benefits

  • 20mm Stud Height: Provides superior drainage capacity for high water table or flood-risk environments.
  • Ideal for Type C Systems: Designed for use in cavity drainage systems in accordance with BS 8102:2022.
  • Durable HDPE Construction: Tough, impact-resistant membrane for long-term below-ground installation.
  • Floor Protection: Isolates finishes from damp or contaminated concrete slabs and helps manage hydrostatic pressure.
  • Compatible with Drainage Channels: Easily integrates with perimeter drainage systems and sump/pump units.

Product Details

  • Material: High-Density Polyethylene (HDPE)
  • Stud Height: 20mm
  • Thickness: Approx. 1.0–1.2mm
  • Roll Size: Typically 2m x 20m (40m²)
  • Colour: Black
  • Application: Floor slabs, basement floors, ground-bearing concrete
  • SKU: BC20MMBLK

Application Instructions

  1. Surface Preparation: Remove debris and sharp projections. Ensure slab or substrate is even and structurally sound.
  2. Roll Out Membrane: Lay Biokil Crown 20mm Membrane stud-side down, cutting to size as required.
  3. Join & Seal: Overlap sheets or butt-joint and seal with appropriate tape or jointing accessories.
  4. Connect Drainage: Ensure water flows freely into perimeter drainage or sump systems before applying floor finishes.

Limitations

  • Not suitable for use as a standalone waterproofing system – must be installed as part of a managed cavity drain system.
  • Not designed for wall application – use Biokil Crown 3mm or 8mm membranes for walls.

Health & Safety

Always wear gloves and protective clothing when cutting or handling. Refer to the product's Safety Data Sheet (SDS) for full health and safety guidance.

Delivery Information
EST Delivery Date Est Delivery between 6th Feb and 12th Feb.

Delivery will always take place on a weekday (Mon - Fri excl. public holidays).

An exact delivery charge will be calculated at checkout based on your order and location. Delivery may be unavailable or may incur additional charges in some remote areas of Scotland and Wales.

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Frequently asked questions

How do I track my order?

As soon as your order is dispatched, you'll receive a dispatch email with delivery dates and details for your order.

If you require an update on your order, you can email customerservice@i4lgroup.co.uk with your order number for assistance.

Can I order now and pay later?

Yes, we offer a variety of flexible payment options to all our customers.

When checking out online, you'll be able to avail of multiple buy now, pay later options with Klarna or PayPal.

The flexible payment options available to you at checkout will be based on the total value of your order.

For B2B customers, you can apply for a 30-day trade credit account, and you'll also unlock:

  • Dedicated trade pricing
  • Loyalty points and rewards
  • A dedicated account manager

Do you really have the best prices online?

Yes! We even have a price match guarantee.

We are so confident that we have the best prices out there that we will match the price of any other online or local retailer.

If you find the same product cheaper elsewhere, we will match the price — just send us the quote or website link.

Read more: Price Match Guarantee

I have a large-scale project, can I get a quote?

Yes, if you are carrying out a construction project that requires a large quantity of materials, email sales@i4lgroup.co.uk with the following information and we will get back to you with your very own bespoke price quote:

  • Delivery postcode and address
  • Mobile number
  • Company name
  • A list of required materials and their quantities

Learn more on opening a trade account.

Can I open a trade account?

Yes! Trade customers can open a B2B account to unlock bespoke pricing, B2B discounts, trade credit, loyalty points, and a dedicated personal account manager.

You can learn more here: Open a Trade Account

Can I cancel or amend my order after placing it?

Yes, if your order has not yet been processed for dispatch, cancellation/ amendments should be possible.

Our team works quickly to get your order delivered as soon as possible so it is likely that your order will be processed for dispatch within 2-3 hours of purchase.

Contact us immediately via customerservice@i4lgroup.co.uk or call 020-3481-1978 during opening hours.

If you wish to amend your order after it has been processed by our team, it will be treated as a return or a separate new order.

Read more: Returns

What is your returns policy?

Changed your mind about your order? no problem! we offer a 14 day returns period after your order is delivered.

To avail of this your order must be unused, in its original packaging, and suitable for resale.

Refunds are issued immediately after the goods are received and inspected by our team.

If an item arrives damaged or incorrect, you must notify us within 48 hours of delivery.

Prior approval is needed before returning any goods – do not return without authorization.

Special order items are exempt from returns.

Read more: Returns

Why Choose Us?

Factors Build4Less Other Stores
Customer service Easy to reach, and eager to help Difficult to contact
Shipping speed Fast and organised Unpredictable
Competitive pricing Price match guarantee What you see is what you get
Loyalty program Points + exclusive deals Basic discounts
Expert advice Free 1-on-1 sessions Self-service only
Trade accounts Bespoke pricing, trade credit, and dedicated account manager none available