RIW LAC Liquid Asphaltic Composition 25L

£296.64 £247.20
In stock
Product Description

RIW products are non-returnable due to shelf-life and quality control.

LAC® is a two coat cold applied bitumen based coating, which dries to a uniform gloss black finish, to provide both waterproofing and a barrier to radon. The coating is a solution of natural and petroleum bitumens in white spirit.

We are happy to help with enquiries, stock availability or any technical help you require, however for security reasons we cannot take orders over the phone. So if you need to chat give us a call on 03301231761 or email us at [email protected].

RIW products are non-returnable due to shelf-life and quality control.

LAC® is typically used on structures below ground level, and as a damp proof membrane to ground floors. LAC® can also be used on the superstructure, as a vapour barrier behind cladding systems / plaster finishes.

When designing Type A structures (as classified in BS8102:2009), the product applied correctly, is capable of providing the levels of protection required for Grades 1, 2 & 3 basements.


  • Proven track record for nearly a century
  • Quick and easy to apply
  • Applied by brush, roller or spray
  • Effective barrier to radon gas
  • Sulphate resistant


  • External Tanking
  • Internal Tanking
  • Retaining Walls
  • Ground Floor DPM
  • Superstructures behind cladding
  • Radon barrier
Data Sheet (1.10 MB)
Customer Questions
Should this product also receive a non-slip application if used as an internal garage floor? The product is very shiny and awkward when you have rain on your shoes whilst within the garage.
RIW LAC isn’t suitable to be used as a wearing surface on a floor, we would recommend RIW Toughseal for this application with an aggregate in the second coat. 
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More Information
Supplier Part Number124695
CoverageApproximately 1m2 per litre with two coats

Orders and Delivery

Free delivery if your order is over £300 ex VAT. Orders between £100 - £300 ex VAT will be subject to a delivery charge of £50 ex VAT. Please note, we are unable to accept orders less than £100 ex VAT

When ordering on line you can specify the date of delivery, however we would not be able to specify the time of delivery on that day.

• Please note that we have a number of large vehicles, including articulated vehicles that may be used for delivery. Please advise us in the comments on your order if access to the delivery address is limited.

• Due to insurance guidelines, delivery personnel are unable to enter private residences. Delivery will be as far as possible to the kerbside of the delivery address. The recipient of the products is responsible for any additional lifting once the delivery has been made. Please bear in mind that Insulation products can be bulky and / or heavy.

• The delivery driver will require a signature to confirm the goods have been received.

 † Unfortunately we, Insulation Express, cannot deliver to the Highlands & Islands of the UK. However we will be happy to deliver to a freight forwarding company on your behalf.


Returns and Refunds

In the unlikely event that you need to return an item, please contact our team on [email protected] within 14 days of accepting delivery of the item.

Restocking charges may apply. We will discuss this with you upon receipt of the cancellation request. Restocking charges will be applied where the products are no longer required AND NOT for goods returned because either defective or damaged.

We usually charge 30% of value (minimum £25.00).

Please note that we cannot accept returns on special orders. Special orders may consist of items sent via third party shipping companies or made to measure products. If you are unsure on whether or not your item is a special order, please contact us on [email protected] prior to placing the order.

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