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Watertite Roof Waterproofing System



A seamless roofing system based on moisture triggered polyurethane technology. The system consists of a chopped strand reinforced base layer, sealed with a finish coat


  • Roofs
  • Balconies
  • Water Towers


  • Seamless – no joints to leak
  • Excellent Waterproofing
  • UV resistant
  • No embrittlement with age
  • Bonds to many existing roof structures
  • Range of colours
  • Fire Rated to EN 1187 B Roof (t4)
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Product: Leeson Watertite Roofing System
Thickness: Determined by application requirements


The substrate should be dry to 75%RH as per BS8204 and free from rising damp.

Asphalt roofing: No primer required.

Concrete: Primer must be used. Minimum 25N/mm2, free from laitance, dust and other contamination.


Primer:Various, see datasheet
Embedment:Leeson Watertite EC (PU4923),Chopped Strand Matting (225gsm)
Sealer: Leeson Watertite UV (PU4924)


The installation should be carried out by an experienced contractor, details of contractors in your area can be obtained by contacting the company.


Leeson Polyurethane’s products are guaranteed against defective materials and manufacture and are sold subject to its standard Terms and Conditions of Sale, copies of which can be obtained on request.




Download Datasheet
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Watertite duck

Download the leaflet

PropertyTest MethodWatertite 25 Year Typical Values
Water Vapour TransmissionASTM E-966.048g m2/ day
Base Coat (lt/m2)1
Chopped Strand Reinforcement225 gsm
Top Coat (lt/m2)1.75
Tack-free time at 19oC85 – 95 minutes
Shower Proof30 minutes
Tensile StrengthASTM D-648 Method A, Die C11 N/mm2
Elongation@ BreakASTM D-648 Method A, Die C25.5%
ModulusASTM D-648 Method A, Die C260 N/mm2


To ensure you are specifying a fit for purpose surface for your project please consult our Area Sales Manager for your area or visit our website.