•
1 1

DIY Refurb

Sovereign Hey'Di Barrier Mortar – High-Performance Waterproof Repair Mortar - 25kg

Sovereign Hey'Di Barrier Mortar – High-Performance Waterproof Repair Mortar - 25kg

SKU: 30607688
EST Delivery Date Est Delivery between 6th Feb and 12th Feb.
£61.30 £73.56
£61.30 £73.56 £0.00
Save Sold out
Shipping calculated at checkout.

How much will I need?

Coverage required
x

We recommend adding 10% of additional product to the calculation to account for errors, damages, and obstacles in your project

Based on your total area of 0m2 (inc. 10% wastage) you will need 1 of this product (total coverage ).
Calculate
Add sampleAdd sample
  • Shipping protection for peace of mind
  • Fast processing and delivery
  • Flexible delivery options
Product Information

Hydrophobic, Non-Shrinking Mortar for Waterproofing & Tanking Junctions

A high-performance, cementitious repair mortar formulated to prevent water ingress at critical junctions. Designed for use as part of the Sovereign Hey’Di Tanking System, it creates a durable fillet at wall/wall and wall/floor joints and can also be used for patch repairs. Its hydrophobic properties and high compressive strength ensure long-term waterproofing without shrinkage or cracking.

Key Benefits

  • Forms watertight fillets at construction joints in tanking systems
  • Hydrophobic & non-shrinking—resists cracking and water penetration
  • High compressive strength over 40 N/mm²—suitable for structural repairs
  • Extended working time up to 5 hours—ideal for complex prep work
  • Excellent adhesion to concrete, stone, brick, and blockwork

Product Details & Coverage

  • Form: Powder
  • Colour: Grey
  • Pack Size: 25 kg bag
  • Yield: Approx. 15 L per 25 kg when mixed with water
  • Coverage: Approx. 1 kg per linear metre for a 25 mm fillet
  • Shelf Life: 12 months in dry, cool, off-ground storage

Application & Mixing Instructions

  1. Apply to clean, damp substrates only (avoid surface water).
  2. Mix powder with clean water to a firm, workable consistency.
  3. Apply 25 mm fillets at junctions immediately after the first coat of Hey'Di K11 has begun to stiffen (approx. 1 hour).
  4. Allow mortar to stiffen for 2–3 hours before overcoating with the second coat of K11.
  5. Do not apply in temperatures below +5 °C.

Usage & Safety

  • Contains cement—may cause skin and eye irritation or burns.
  • Wear protective gloves, clothing, and eye protection during use.
  • Avoid contact with skin and eyes; rinse immediately with clean water if contact occurs.
  • Use only in well-ventilated areas.
  • Keep out of reach of children.

For comprehensive health and safety information, refer to the Safety Data Sheet.

Ideal For

  • Forming fillets in waterproof tanking systems (Hey’Di K11)
  • Basements, cellars, retaining walls, and below-ground structures
  • Patching cracks and repairing damp-prone masonry
  • Preparation before cementitious waterproof coatings

Comparison Table

Feature Barrier Mortar Regular Mortar Hydraulic Cement
Waterproof Yes No Yes
Shrinkage-Free Yes No Partially
Application on Active Leaks Yes No Yes
Tanking Fillet Use Yes No No
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.

View full details

Recently viewed

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