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DELTA®-PT insulates damp structural surfaces and also provides a bonding base for gypsum plaster, lime plaster render and reinforced shotcrete wall finishes.


The Problem
Old buildings often have dampness in walls and other inside surfaces due to inadequate or defective waterproofing. Rewaterproofing of an existing foundation wall is usually expensive - or impossible when outside access is limited by neighbouring structures. The damage must therefore be repaired from the inside: by installing a new masonry shell covering the damp inner surface. However, this is not a cure-all as the new shell too will soon become humid by continuing dampness migration from the structure - and takes up considerable space within the structure.

The Solution
DELTA®-PT - the watertight dimpled sheet with an integrated mesh bedding for the inside surface finish. Its 8 mm stud structure on one side provides an air gap which ensures continuous ventilation and full-surface drainage to remove incoming moisture.

The rugged HDPE mesh on the other side provides secure bonding with a variety of surface finishes including gypsum plasters, lime cement renders and (using steel mesh reinforcement) reinforced shotcrete.

DELTA®-PT in Underground Structures
> Tunnels
The unsecure inside surfaces of the tunnel is first removed and levelled. The tunnel is then lined with the DELTA®-PT (installed with the studded side against the structure).

The stud design provides full surface drainage capacity. Incoming water is redirected to take-off pipes below. A steel reinforcing cage installed on the mesh side of the DELTA®-PT sheet provides the base for the shotcrete finishing layer.

Examples of the many tunnels successfully renovated with DELTA®-PT include the Vienne, Clelles and Sorbières railroad in France, the Wipking tunnel and the Filisur pressure shaft in Switzerland and the Rehberg, Büdenholz and Brachbach tunnels in Germany.

In the Brachbach tunnel project, DELTA®-PT was installed over a quick-drying shotcrete levelling layer to provide full-surface drainage.

The inward-facing mesh provided a secure bed for application of the inner shotcrete shell.

> Public transport Systems DELTA®-PT's combination of drainage capacity and mesh bedding is also ideally suited for applications in underground railway construction.

Some examples of DELTA®-PT underground station renovation projects: In Great Britain; the Oval, Clapham, Tooting Broadway and Tooting Bec underground stations in London: In Spain; the El Clot L1 Pca. Espanya, El Clot L2, Tres Torres metro stations and Sabadell main station in Barcelona.

> Underground parking Garages An example from Taiwan - the Far Eastern Plaza parking garage facility in the city of Taipeh.

In this application DELTA®-PT's drainage capacity eliminated the need for costly large-scale waterproofing measures.
DELTA®-PT: - Technical Data
Dimpled sheeting with plastic mesh welded on, suitable as a damp-proof base for plaster or shotcrete, e.g., as a seepage layer in tunnel construction, or for repairing basements internally

Material:
Thickness:
Stud height:
Roll size:
Compressive strength:
Drainage capacity:

 

Void between studs:
Temperature resistance:
Chemical properties:
Behaviour in fire:

 high density polyethylene
approx. 0.5 mm
approx. 8 mm
2.0 x 20 m/ 1.5 x 10 m
approx. 70 kN/m2
approx. 5 l/s • m
approx. 300 l/min • m
approx. 18 100 l/h • m
approx. 5.5 l/m2
- 30°C to + 80°C
resistant to chemicals, resistant to root penetration, rotproof, neutral towards drinking water
B2 accord. to DIN 4102