Why remove the old bitumen felt?
Cover it with the Mariseal System
The Mariseal System is a group of coatings based in Polyurethane resins, which used in combination, creates a seamless membrane on the the flat roof, terrace or deck that protects the building structure reliably and on a long term basis, even under the most difficult conditions.
AdvantagesProfessional waterproofing applicators in over 45 countries use the MARISEAL SYSTEM for demanding waterproofing.The reasons are:

- simple application
– when applied, forms a seamless membrane without joints or leak possibilities
– resistance to water
– crack-bridging up to 2mm, even at -10o C
– maintenance of it’s mechanical properties, over a temperature span of -30o C to +90o C
– provides water vapor permeability
– provides full surface adhesion
– provides sun reflectivity, contributing to thermoinsulation provides anti-root properties
- the waterproofed surface can be used for medium to heavy pedestrian traffic, depending on the MARISEAL SYSTEM top coat
- resistant to detergents, oils and common chemicals
- easy local repair, if the membrane is mechanically damaged
- low cost
Uses
It can be used on:
- Roofs 
- Balconies & Terraces 
- Wet Areas 
- Water Tanks / Ponds 
- Pedestrian Decks 
- Parking Decks / Bridges 
- Detail Waterproofing 
- Decorative Waterproofing 
- Polurethane Foamed Roofs 
Certificates

The basic components of the MARISEAL SYSTEM where tested by the German state testing institute for construction materials MPA-Braunschweig according the European Union Directive for liquid-applied roof waterproofing kits ETAG 005 and were found conforming. The basic components of theMARISEAL SYSTEM where certified by the German state Institute for construction techniches DIBt-Berlin with the European Technical Approval (ETA) and with the CE-mark and certification. The basic components of the MARISEAL SYSTEM has also been tested and certified in many countries around the world according to local and national regulations and norms.