Lava 20 Liquid Waterproofing System
One system.
A huge range of roofs.
Reinforced liquid waterproofing designed for professional roofers.
Lava 20 is a professional two-coat, reinforced liquid waterproofing system designed to create a seamless waterproof finish across a wide range of roofing substrates.
Whether you’re installing a new flat roof, refurbishing an existing system or waterproofing a roof with complex details, Lava 20 gives you one highly versatile system that can be used across multiple applications.
Less reliance on different roofing systems. More jobs you can tackle with Lava 20.
2 COAT
Reinforced System
25 YEAR
Guarantee Eligibility*
SEAMLESS
Liquid Waterproofing
MULTI
Substrate System
Why Lava 20?
Built for the realities of roofing.
Lava 20 combines the flexibility of a liquid-applied waterproofing system with reinforcement throughout the waterproofing build-up.
Versatile
One system.
Multiple surfaces.
Lava 20 can be used across a wide variety of roofing substrates, helping reduce the need to carry completely different waterproofing systems for different roof types.
Reinforced
Reinforcement
where it matters.
The Lava 20 system incorporates matting within its two-coat build-up to create a reinforced waterproofing system across the roof area.
Refurbishment
Ideal for
overlays.
Suitable existing waterproofing systems can often be refurbished rather than completely stripped out, subject to inspection, correct preparation and the appropriate primer.
Detailing
Built around
awkward details.
Liquid application makes Lava 20 particularly useful around upstands, penetrations, outlets, changes in level and other areas where traditional sheet systems can become more complex.
Typical Applications
One system. Plenty of uses.
Lava 20 is suited to new waterproofing installations, existing roof refurbishment and the awkward detailing found on real roofing jobs.
New Flat Roofs
Complete liquid waterproofing systems for new flat roof installations.
Roof Refurbishment
Overlay and refurbishment of suitable existing roof coverings.
Extensions
Waterproofing domestic extensions and flat roof areas.
Garages
New and refurbishment waterproofing for garage roofs.
Complex Detailing
Upstands, penetrations, outlets, corners and awkward interfaces.
Podium Decks
Waterproofing suitable podium and deck constructions.
Planters
Waterproofing suitable planter constructions and associated details.
Repairs & Upgrades
Upgrade suitable existing roof areas as part of a wider refurbishment.
Multi-Substrate Waterproofing
What can Lava 20 go over?
With the correct preparation and, where required, the appropriate primer, Lava 20 can be installed across an extensive range of roofing and construction substrates.
Timber
OSB
Asphalt
Concrete
Metal
GRP
Foam
TPO
EPDM
Felt
Slate
Podium Decks
Planters
Substrate condition, preparation and primer requirements vary. Always inspect the existing surface and refer to the relevant Lava 20 technical information before application.
Buy Lava 20 From The Roofing Outlaw
Now we’re giving you even more.
Get the Lava 20 system you need for the job and take advantage of additional savings, free catalyst, application equipment and professional Lava 20 training on qualifying orders.
20% OFF
Lava 20 Kits
FREE
Catalyst
£50
Application Kit*
FREE
One Day Training*
What does my kit include?
The bigger the roof.
The bigger the package.
Every Lava 20 kit receives the 20% promotional discount and free catalyst. From 6m² upwards, we’ll also include our £50 Application Kit. Order 20m² or more of qualifying Lava 20 and we’ll include a free One Day Lava 20 Masterclass too.
Sample Kit + 2m² Kit
Try Lava 20.
20% OFF
✓ 20% Discount
✓ Free Catalyst
✕ Application Kit
✕ Free Training
6m² Kit
Now with the tools included.
+ £50 KIT
✓ 20% Discount
✓ Free Catalyst
✓ £50 Application Kit
✕ Free Training
10m² Kit
Combine kits and unlock training.
The 10m² kit includes the 20% discount, free catalyst and £50 Application Kit. Free training is unlocked when the qualifying Lava 20 quantity within the same order reaches 20m² or more.
✓ 20% Discount
✓ Free Catalyst
✓ £50 Application Kit
✓ Training at 20m²+
Example
Two 10m² kits within the same order total 20m², so the order qualifies for the free One Day Lava 20 Masterclass.
20m² • 30m² • 50m² • 100m² • 500m² • 1000m²
The full Lava 20 package.
Order 20m² or more and we’ll give you the lot.
20% OFF
Lava 20 promotional discount
FREE Catalyst
Included with your Lava 20 kit
£50 Kit
Application Kit included
FREE Training
One Day Lava 20 Masterclass
Worth £50
Your Lava 20 Application Kit.
Order a qualifying Lava 20 kit from 6m² upwards and we’ll include an application kit worth £50.
1 × 4" Roller
1 × 4" Roller Sleeve
1 × 9" Roller
1 × 9" Roller Sleeve
1 × 9" Spike Roller
1 × 1" Brush
1 × 2" Brush
1 × 4" Brush
Order 20m² or More
Learn how to install Lava 20. On us.
When the qualifying Lava 20 quantity within your order reaches 20m² or more, you’ll receive a voucher for a FREE One Day Lava 20 Masterclass.
Get hands-on experience with the Lava 20 system, understand the correct preparation and application process and develop the confidence to install the system correctly on site.
IMPORTANT — USE THE SAME EMAIL ADDRESS
Your free training voucher is linked to the email address used when placing your Lava 20 order. When booking your One Day Lava 20 Masterclass, you must use the same email address used on the qualifying order.
If a different email address is used, the free training voucher will not work.
Another Saving
FREE DELIVERY OVER £200
Spend over £200 and we’ll deliver your qualifying order free of charge.
The Roofing Outlaw Lava 20 Offer
The system you need.
More included with it.
20% OFF
FREE CATALYST
£50 APPLICATION KIT*
FREE TRAINING AT 20m²+*
FREE DELIVERY OVER £200
Make the switch to Lava 20.
Waterproof more roofs with one versatile system.
*25-year Lava 20 guarantee eligibility is subject to the applicable system specification, installer requirements, correct preparation and application, and Roofing Outlaw/manufacturer guarantee terms.
Promotional terms: The £50 Application Kit is included with qualifying Lava 20 kits from 6m² upwards. The Sample Kit and 2m² Kit do not qualify for the free Application Kit. The Free One Day Lava 20 Masterclass voucher applies where the qualifying Lava 20 quantity within a single order totals 20m² or more. A single 20m² kit qualifies. Multiple qualifying Lava 20 kits may also be combined within the same order to reach the 20m² threshold. The same email address used to place the qualifying Lava 20 order must be used when booking the training course. If a different email address is used, the voucher will not work. The free One Day Lava 20 Masterclass promotional offer ends on 17 December 2026. Promotional offers are subject to availability and applicable terms.
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