Flat Roof Waterproofing
A typical two-coat system for new and refurbishment flat roofs, applied at the specified total rate to create a seamless membrane.
Repair, detail and waterproof
Waterproof the details sheet systems miss.
Liquid Rubber HBS200 is a single-component, cold-applied membrane for flat roofs, repairs, box gutters, penetrations, upstands and complex waterproofing details.
One component
No flame
Two-coat system
25-year warranty
Liquid Rubber HBS200COLD APPLIED
Waterproofing specification
2.7kg/m² ≈ 2mm membrane
Typical waterproofing rate across a two-coat system. Substrate and detailing still determine the complete specification.
See coverage guidanceWater-based
Solvent-free emulsion
Cold applied
Brush, roller or squeegee
Apply above 5°C
Clean, sound, dry substrate
Stocked in Blackburn
Collection and UK delivery
Quick answer
What is Liquid Rubber HBS200?
Liquid Rubber HBS200 is a single-component, water-based and solvent-free elastomeric bituminous emulsion supplied by Forti Nova from its Blackburn depot. Applied cold by brush, roller, squeegee or suitable spray equipment, it forms a seamless, flexible and fully adhered membrane for flat roofs, repairs, box gutters, penetrations, balconies and other complex details. A typical waterproofing system uses two coats at a total rate of approximately 2.7kg/m² to produce a 2mm membrane. HBS200 is distinct from SprayGrade, the separate two-component commercial spray system.
Liquid rubber roofingLiquid waterproofingBrush-applied membraneRoller-applied waterproofingCold-applied liquid roof coatingRubber roof paintFlat roof sealantRoof repair liquid
HBS200 is part of the Liquid Rubber waterproofing range. Forti Nova supplies the system and provides current product documentation, substrate guidance, training and project support.
Start with the problem
Liquid waterproofing shaped around the detail.
HBS200 is most valuable where continuity, adhesion and the ability to follow irregular geometry matter more than laying a large sheet membrane.
Roof Repairs & Patching
Local repairs to compatible, sound existing coverings where a fully adhered liquid membrane suits the geometry and condition.
Box Gutters & Outlets
Continuous waterproofing through gutter profiles, outlets and transitions, with geotextile reinforcement at cracks and changes of material.
Upstands & Penetrations
Brushable detailing around pipes, rooflights, parapets and roof-to-wall junctions where sheet membranes are harder to form.
Metal & Zinc Details
Cold-applied protection to suitably prepared compatible metal and zinc surfaces, subject to specification and primer guidance.
Concrete, Stone & Timber
A flexible waterproofing layer over clean, sound and dry concrete, stone and timber substrates prepared for the system.
Problem-solving waterproofing
Use HBS200 where the roof needs continuity.
The substrate must remain sound, clean and dry. HBS200 can avoid unnecessary strip-out on suitable roofs, but it should not be used to hide saturated, loose or structurally failed build-ups.
Residential extensions and garden rooms
Commercial and industrial flat roofs
Warehouse and factory buildings
Schools and educational buildings
Retail and office buildings
Agricultural buildings
Housing associations and local authorities
Contractors and roofing specialists
Problem: Leaking flat roof
Create a new seamless waterproof layer over a compatible, sound and correctly prepared existing surface.
Problem: Failed box gutter
Follow the entire gutter profile without sheet laps, reinforcing cracks, joints and material transitions with geotextile.
Problem: Leaking penetration
Form a continuous membrane around pipes, outlets, rooflights and irregular shapes.
Problem: Cracked or failed detail
Bridge the affected zone with geotextile embedded into the first wet coat before the full system is completed.
Problem: Cut edge corrosion detail
Seal suitably prepared exposed metal edges as part of a specified repair. For full metal-roof refurbishment, compare Prokol TopSpray35.
Problem: Complex roof-to-wall junction
Carry a flexible waterproof layer across compatible roof and upstand surfaces, following primer guidance where required.
Problem: Temporary standing water
Correctly applied HBS200 can tolerate temporary standing water, although positive drainage remains the recommended design approach.
Technical specification
The numbers that shape the system.
Use the correct total application rate and preparation for the intended performance. Conditions, substrate and detail design still matter.
Single component
Ready to mix and apply
1.35kg/m²
≈1mm airtight
2.7kg/m²
≈2mm waterproof
≈1 hour
Touch dry
≈24 hours
Full cure, conditions dependent
5°C minimum
Application temperature
≈850%
Elongation
>90%
Recovery
1kg · 5kg · 20kg
Available pack sizes
25 years
Product warranty*
Four methods
Brush, roller, squeegee, spray
Two coats
Typical waterproofing system
*25-year product warranty when HBS200 is correctly specified and applied.
Application method
Prepare, reinforce, coat and protect the cure.
HBS200 is simple to apply, but performance depends on preparation, thickness and reinforced detailing—not on coating over defects.
Prepare the substrate
Confirm the surface is clean, sound and dry. Remove contamination and deal with loose or failed material. Check whether primer is required.
Reinforce vulnerable details
Embed geotextile into the first wet coat at cracks, joints, changes of material and other movement-prone details.
Build the specified thickness
Apply the typical two-coat system by brush, roller, squeegee or suitable spray equipment to the required total rate.
Allow the membrane to cure
Keep the application above 5°C and protect it from rain. Touch dry is approximately one hour; full cure is approximately 24 hours depending on conditions.
Coverage guidance
Order from the specified membrane thickness.
Coverage is calculated from the total application rate, not from a generic number of coats. Allow separately for substrate texture, waste, detailing and reinforcement.
Pack≈1mm airtight≈2mm waterproof
1kg0.74m²0.37m²
5kg3.7m²1.85m²
20kg14.8m²7.4m²
Indicative theoretical coverage based on 1.35kg/m² and 2.7kg/m². Confirm the project allowance before ordering.
Choose the right waterproofing system
HBS200 vs EPDM vs SprayGrade.
The right system depends on geometry, substrate, size, access, application method and the condition of the existing roof.
You are here
HBS200
Single-component liquid membrane for repairs, gutters, upstands, penetrations and complex details.
Best for detail-led waterproofing
Brush, roller, squeegee or suitable spray
Sheet membrane
EPDM roofing
Cold-applied sheet system for planned, simple flat and low-slope roof build-ups.
Best for clean, open roof areas
Fully adhered sheet membrane
Commercial spray system
SprayGrade
Separate two-component system for rapid spray application over large commercial areas and complex geometry.
Best for scale and speed
Specialist two-component spray
Supply, support and documents
Product knowledge that follows the project.
Use the technical data, confirm the substrate and ask for project-specific support before the material is applied.
Technical Data Sheet
Current application rates, preparation, performance and limitations.
Request current TDSSafety Data Sheet
Handling, storage and safety information for HBS200.
Request current SDSContractor Training
Practical system knowledge, application methods and reinforced detailing.
View trainingInstallation Enquiry
Send roof dimensions, substrate details, problem areas and photographs.
Start tailored enquirySubstrate compatibility
Suitable substrates include concrete, stone, metal, bitumen, timber, PVC and zinc when correctly prepared. EPDM requires the appropriate primer. Weathered or unusual surfaces should be checked before specification.
Need a technical answer?
Talk through the substrate
Blackburn collection point
Choose the pack, check the detail, collect the system.
HBS200 is available in 1kg, 5kg and 20kg packs from our Blackburn depot, with technical help for preparation, coverage and compatible detailing materials.
Unit 1–3 Bridgewater Business Park
Gladstone Street, Blackburn, BB1 3DL
Mon–Fri 7:30am–4:30pm · Sat 8am–12pm
Related products and systems
Continue through the waterproofing estate.
Compare the roof type, problem and delivery method before choosing a system.
Straight answers
Frequently asked questions about Liquid Rubber HBS200.
Liquid Rubber HBS200 is a single-component, water-based and solvent-free elastomeric bituminous emulsion used on flat roofs, gutters, box gutters, parapet walls, penetrations, dormers and balconies. It is applied cold by brush, roller, squeegee or suitable spray equipment. Once cured, it forms a seamless, elastic waterproof membrane that adheres to suitable prepared substrates including concrete, stone, metal, bitumen, timber, PVC and zinc. EPDM requires the appropriate primer.
Local HBS200 supply
Liquid Rubber HBS200 across the North West.
Explore local stock, collection, delivery and technical-support information for your area.
From product to protected roof
Make the detail waterproof—not just coated.
Choose HBS200 packs, request current technical documents or send the roof details for application and installation guidance.
Mon–Fri 7:30am–4:30pm · Sat 8am–12pm