• Flat Roof Supplies to Trade and DIY
  •   Rated Excellent
  •   Secure Payments
  •   Price Promise

ClassicLiquid Joint Mastic

Used for sealing joints and cracks 

Size: 600cc

In stock
£11.40 £9.50

ClassicLiquid Joint Mastic 

ClassicLiquid Joint Mastic is a novel low modulus expansion joint sealant, especially formulated to contain both PU and Silylated-PU technology, thus giving rise to a sealant which includes the best of both technologies. It has been modified in order to give enhanced thixotropic properties.

Joint Mastic cures by reaction with atmospheric humidity to produce a joint sealant with a 50% joint movement accommodation factor and excellent adhesion on substrates, traditionally problematic for PU sealants such as glass, aluminium, steel, polycarbonate, etc. Joint Mastic is easy to apply even in very low temperatures and the storage stability is unlike any polyurethane sealant in the market.

Features and Benefits:

  • Excellent adhesion to almost any surface
  • Excellent chemical resistance,
  • Low modulus, joint movement accommodation 50%
  • Microorganism and fungus resistant
  • Application underwater immersion possible
  • Excellent resistance to heat >600˚C and will remain flexible down to -400˚C

Recommended for seeling joints in:

  • In situ concrete
  • Expansion concrete plates
  • Precast panels
  • Brick and block work
  • Water tanks
  • Metal frames
  • Aluminium windows and panels
  • Water tanks and swimming pools
  • Sealing between T&G joints in OSB3 T&G structural roof decks
  • .
Technical Details
More Information
SKU CL-Joint-Mastic
Stock Type Warehouse Fulfilled
Color Grey
(Size: 193 KB)
(Size: 127.5 KB)
Questions & Answers (4)
Customer Questions
What is ClassicLiquid ?

Classic-Liquid is a polyurethane liquid system, ideal for complicated roofs where a membrane may not be an option. No nonsense straight out of the tin. This system can be laid onto many existing surfaces and has a 25-year life expectancy and 10 year guarantee.

Classic-Liquid is a low odour, single component polyurethane liquid membrane. It's formulation allows a fast curing, bubble free, single coat application, seamless roofing system to be created. Due to its excellant tensile strength there is usually no need to incorporate a reinforcing fabric, making application simple and fast. Other components offered alongside the basic system allows for a wide range of applications and solutions.

Do I need to mix an activator with ClassicLiquid

No, The Classic liquid system is moisture curing and does not require an activator or catalyst. It will become showereproof 30mins after application and trafficable after 24 hours. 

Does the ClassicLiquid System come with a Warranty ?

Yes, The Classic Liquid Waterproofing system is garranteed for either 10, 15 of 20 years depending on coverage rates used. 

What is the coverage rate of ClassicLiquid Joint Mastic?

Coverage rate are as follows 
24 metres at 5mm wide x 5mm deep
12 metres at 10mm wide x 5mm deep
4 metres at 15mm wide x 10mm deep
3 metres at 20mm wide x 10mm deep

Supplier Member certified by NFRC
Feefo logo
We accept: Visa, Mastercard, Maestro, PayPal, Apple Pay and Google Pay