The BW1 Ultimate Bathroom Waterproofing and Tanking Solution is your all-in-one anti-bacterial waterproofing membrane for bathrooms, showers, saunas, steam rooms, and wet areas. It’s easy to use, requires no priming, and cures quickly, saving both time and money.

Powered by C-TEC’s TRIBRID® technology, BW1 offers superior bonding, flexibility, and a unique formula that prevents mold and fungal growth. Pair it with BT1 sealant and adhesive for a durable, healthier bathroom solution.

Key Points:

  • Fuss-free application with a fully waterproof surface
  • No priming needed, saving time and costs
  • Strong bonding on multiple substrates
  • Flexibility to handle thermal expansion and contraction
  • Quick curing, ready for tiling or waterproof panels in under 24 hours
  • Anti-bacterial formula prevents mold and fungal growth
  • Tested to meet ETAG 022 Annex E standards
  • Powered by TRIBRID® technology, compatible with BT1 and CT1
  • Safe for use in confined spaces
  • Smooth, easy-to-apply finish designed for professionals

£4.99 Standard Delivery, or FREE on most orders over £99* (some exclusions apply)

£9.99 Next day delivery is available for orders places before 12 noon. Any orders placed for next day delivery after this time, will take 2 working days to be delivered.

Working/delivery days are Monday to Friday, deliveries will not normally be made Saturday or Sunday.

We offer a 30-day returns policy on on the majority of our items*, as long as the item is unused, undamaged and unopened**. We only ask that the postage is covered by yourself. 


* Please see our delivery page for further details on specific exceptions.

** Some products that are made to order or personalised cannot be returned.

***Exclusions apply for items shipped directly from our suppliers, and some big & bulky items may incur an additional charge. Please see our delivery page for full details. 

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C-TEC BW1 5L Ultimate Bathroom Tanking Solution

  • Now $223.58
  • (FREE UK Delivery)
Item in Stock   |   Usually dispatched within 24 hours
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Free UK Delivery on most orders over £99
Delivery Rates & Information

Delivery Options

Standard Delivery: £4.99 - Free for all orders over £99.*
Next Day Delivery: £9.99 - Available for orders placed before 12:00 PM (Noon).

Important Delivery Notes

Next Day Delivery Cut-off: Orders placed after 12:00 PM (Noon) using Next Day Delivery will be delivered within two working days.
Working Days: Our standard delivery and shipping days are Monday through Friday. We do not normally deliver on Saturdays or Sundays.

Easy 30-Day Returns

We want you to be happy with your purchase! We offer a 30-day returns policy on all items, provided the following conditions are met:
  • The item is unused and undamaged.
  • The item is returned in its original packaging.
  • The customer is responsible for the return postage costs.

Combining Your Order

We always strive to combine your order into a single delivery. However, your order may arrive in multiple shipments if it contains:
  • Items from different warehouses (Standard items).
  • 'Direct' items (These are shipped separately and directly from the supplier) and will arrive separately from other items in your order.

*Exclusions & Additional Charges

The following items may be excluded from standard shipping rates or may incur extra delivery charges:
  • Items Shipped Directly from Suppliers ('Direct' items).
  • Certain Large or Bulky Items.
Want it by Monday 12th October? Order within 2 hours, 51 minutes