As buried or immersed structures, tunnels are more at
risk from water ingress than most other types of structures and
repairing tunnels can be difficult, expensive and highly
Therefore construction has to be right first time - and every
time. Only technically proven systems should be utilised in the
construction and maintenance of this key infrastructure assets.
Waterproofing that is 100% effective is leaking. At best this can
be unsightly in areas exposed to the public such as underground
stations. At worst it will cause degradation of the structre
itself, creating the potential of major remedial works and shorter
service life for the tunnel.
The waterproofing system for a tunnel should be an integral part
of the design from the outset. The tunnel designer must consider
the acceptable level of water ingress - which should effectively be
Tunnel waterproofing has traditionally been based on sheet
materials that are welded together on site to form a membrane.
Waterproofing integrity is dependant on the continuity and quality
of the numerous seams which are all potential weak points. This
problem is exacerbated in tunnels of complex shape.
Since the 1960's
Pitchmastic PmB has been protecting
the world's transportation assets using unique seamless
Our products are suitable to be applied across a variety
of substrates and in a wide range of climates.
- Bored (NATM/SEM/SCL)
- Cut & Cover Tunnels
- Immersed Tunnels
- Suspended Deck