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Allsealed Roof Waterproofing System


A one component; moisture triggered elastomeric urethane coating specifically developed as a high performance waterproofing membrane for use on roof surfaces.




  • Seamless – no joints to leak
  • Excellent waterproofing
  • Good application characteristics for easy by-hand application
  • Short cure times allowing product to be over coated quickly
  • Bonds to many existing roof structures

Product Specification

Product: Leeson Roofing System

Thickness: Determined by application requirements

Manufacturer: Leeson Polyurethanes Ltd.

Telephone: + 44 (0) 1926 833367

Substrate 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.

Products Included in this System

Primer: Various, see datasheet

Embedment: Leeson Base Coat (PU5558 EC)

Chopped Strand Matting (225gsm)

Sealer: Leeson Top Coat (PU5574 TC)


Detailed installation instructions are available
on request.

Installation Service

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

Leeson Allsealed System Guide

Important Note

Leeson Polyurethanes’ 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
Contact us for more information

Technical Information

The figures below are typical properties achieved in laboratory tests at 210C and 55% Relative Humidity.

Test MethodRoof Waterproofing System Typical Values
Water Vapour TransmissionASTM E-966.048g m2/ day
Base Coat (lt/m2)1.2
Chopped Strand Reinforcement225 gsm
Top Coat (lt/m2)1.75
Tack-free time at 19oC 85 – 95 minutes
Shower Proof30 minutes
Tensile StrengthASTM D-648

Method A, Die C

8.02 N/mm2
Elongation at BreakASTM D-648 Method A, Die C9.90%
Modulus StrengthASTM D-648 Method A, Die C187.57 N/mm2

Further Information

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