Basement Waterproofing

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Basement Waterproofing

Pre-Applied Waterproofing System for Underground Structures

Proposed Waterproofing System

Location Description Remarks
Basement Base Slab (Level 10) 1.2mm thick preformed HDPE pre-applied WP membrane Membrane bond up to base slab and don’t require screed
CBPWith Skin Wall (Confined space) 1.2mm thick preformed HDPE pre-applied WP membrane Membrane bond up skin wall directly.
All construction Joints at D-wall Reinjectablehose with Gel + Rubber Hydrophilic Waterstop All joints between D-Wall and basement floor slab.
Concrete Joints Rubber Hydrophilic Waterstop All concrete joints at basement concrete joints.
Waterproof Admixture into concrete at all basement structures. Crystallisationpowder admixture mixed into cocnrete WP admixture into concrete.
Top Slab 1.5mm thick self adhesive c/oHDPE and rubberized asphalt preformed membrane, including primer Require Protection board before backfiling

Key Advantages of Pre-Applied Membrane for Basement

  • Preformed membrane advantages outweighs liquid applied membranes in substructure site conditions such as no curing time of membrane and spraying liquid membrane to damp concrete issues.
  • Pre-Applied membranes ensures speed in installation and are more site tolerant in underground situation.
  • The special adhesive in the pre-applied membrane allows the base slab and the inner skin wall concrete to bond fully to membrane, providing a positive side tanking, unaffected by ground settlement with the membrane fully bonded to the actual basement structure, thus isolating any seepage.
  • Using spray liquid membranes at this basement, means the membrane will bond to the lean concrete and to the CBP wall, which means the membrane is not fully bonded to the basement concrete structure, thus they are subjected to ground settlement.


Waterproofing Detail to Station Structure with confined Wall Side  (D-Wall/CBP Area)

Pre-Applied HDPE Waterproofing Membrane System For Base Slab & Confined Wall (D-Wall/CBP)

  • 1.2mm thick HDPE preformed membrane c/o of a HDPE film with a special pressure sensitive adhesive on one side.
  • Pre-applied membrane means, you lay the membrane first, then cast concrete direct to the membrane, to achieve a full bond.
  • Loose laid the membrane on lean concrete and don’t require primer.
  • Do not requires protection cement sand screed, to allow membrane to bond upward ullyto the base slab.
  • Meets and exceed Singapore LTA MRT specifications for waterproofing of underground structures.
  • Lapping of membrane are by self adhesive-No torching or heat welding required.


Pre-Applied Waterproofing Membrane To Base Slab

  • Loose lay membrane onto lean concrete with adhesive side facing the sky.
  • Remove the plastic liner to expose adhesive.
  • Lay rebarssitting on spacer blocks.
  • Ready to cast base slab concrete directly to membrane.
  • Membrane will fully bond upwards to base slab.
  • Protected with a plastic release film.
  • Lay Rebar sitting on spacer blocks directly to membrane, membrane has high compressive deflective strength to hold the load.
  • Rebarsare placed sitting on spacer blocks, getting ready to cast concrete for base slab.
  • Side laps are 75mm with black line for lapping, already with self adhesive laps, roll with heavy roller or by hand to seal the lap.
  • End laps to be at 100mm and sealed with 120mm wide Tape.
  • The membrane can be left up to 40 days exposure, however try to cast concrete asap.
  • Membrane will achieve bond strength once the concrete base slab is cured.
  • Any puncture to membrane, you can cut a new patch of the tape and repair with 50mm extend all directions of the punctured area.
  • The membrane uses a PSA (Pressure sensitive adhesive) to allow concrete to bond to membrane through pressure over time and heat.


Pre-Applied Waterproofing Membrane To Confined Basement Wall

  • The membrane can be used in confined site walls such as D wall/CPB/sheet piles.
  • Using an inner skin concrete wall, the membrane can be placed in between D-wall and the inner leaf wall.
  • The membrane will bond fully to the inner leaf wall and not to the D-wall.
  • Membrane is temporarily hanged onto the D-wall using nails or screws, to receive the concrete.
  • Membrane nailed at intervals to the D-Wall to hang temporarily to receive wall concrete. The nails are done on the lap area, as next membrane lap will cover the nail. Or use a Tape to seal a exposed nail. Gun nails may be used to anchor the membrane.
  • Wall membrane can receive the rebarsand wall slab casted with concrete using one sided formwork. Once concrete set, the membrane will bond fully to the wall slab and not to the D-wall/CBP.


Detailing around Piles and King Posts

  • When wrap around piles or terminations, a PU liquid applied membrane will be used to seal around piles caps/heads as shown.
  • Also at king posts, same treatment shall be done. The king posts should have welded flanges between them and the concrete, and an idrostop rubber hydrophilic waterstop applied arounfd flange.


Termination of membrane at base slab to CBP wall-Sealed with a PU liquid applied membrane.

D-Wall at starter bar area lined with reinjectablehose and hydrophilic rubber waterstop.

Detailing around Kingpost and Piles & laying of rebarson the membrane at base slab.

Self-adhesive synthetic waterproofing membrane

Technical Data Sheet

It can be applied as a fluid barrier in tunnel and underground structures construction.

Where to use

  • Open cut tunnel waterproofing.
  • Underground structures waterproofing.

Technical Characteristics

Due to the special formulation achieved at laboratories, can accomplish different waterproofing requirements. The product is a premium pre-applied waterproofing membrane intended to form a continuous protective outer layer, firmly bonded to the underside of a poured concrete slab and to the outside of basement walls in confined spaces to prevent the ingress and lateral migration of water, moisture and gas.

Due to the high standard production level, performs both high mechanical properties and workability characteristics.

Main characteristics:

  • High workability
  • High mechanical resistance.
  • High resistance to permanent pressure.
  • High resistance to root action.
  • High resistance to low temperature.
  • Non-toxic.



Supplied in 25 m rolls.

Storage and Waste Disposal

It is stable on ordinary working conditions. It is advised to store the product at the site in its original sealed packaging.

Safety Instructions For Preparation and Application

It is an article and referring to the current European regulations (Reg. 1906/2007/CE – REACH) does not require the preparation of the material safety data sheet.

 TECHNICAL DATA (typical values)
 Color: White
 Dimensions :
 Thickness (ASTM D-3767) (mm):  1,2
 Standard roll length (m): 25
 Width (UNI 1848-2) (m):  1,5
 Tensile strength at break (ASTM D-882) (MPa):  24
 Elongation at break (ASTM D-882) (%):  500
 Lateral water migration resistance (ASTM D-5385) (m)  Pass at 70 m
 Peel adhesion to the concrete (ASTM D-903) (N/m)  880
 Lap peel adhesion (ASTM D-1876) (N/m)  880
 Resistance to hydrostatic head (ASTM D-5385) (m)  70
 Puncture resistance (ASTM E154) (N)  990
 Low temperature flexibility (ASTM D-1970) (˚C)  -29
 Crack cycling at – 23 ˚C, 100 cycles (AST C-836)  Pass
 Water absorption (ASTM D-570) (%)  < 0,5

The Dynamic Waterproofing Material


It is a trowel applied, recycled, single component, cold applied, <1% VOC, highly elastomeric modified polymer rubber gel with exceptional adhesive properties. Deneff-Seal is a component of the composite POLY-AS, for both pre-applied and post-applied waterproofing systems for above and below grade construction. Its superior flexibility, adhesiveness and self-healing characteristics make Deneff-Seal the ideal choice for effective, permanent waterproofing.


• Applied to many substrates, even adheres in damp conditions


• Durable to continuous movement including shocks and vibration

• Responsive to substrate movement

• Self-healing and self-sealing capabilities

• Easy repair and maintenance


• One component that doesn’t require mixing and is easily applied

• No mixing chemicals, safe

• Easily stored and transported


• Environmentally friendly, no VOC’s, and safe for installers

• Made from recycled content


• Impervious to freeze-thaw cycles

• Effective and long-lasting waterproofing


Site Condition


Soft ground formed by the reclamation project Near the sea, underground water levels and water pressure are greatly affected. D-wall application, No waterproofing layer.


Leakage Cause and Situation


Water leakage appear vertical and horizontal Joint

Water penetrated into D-wall and spread through rebar

Water comes out from D-Wall Construction Joint(C/J)




Repair plan for horizontal Joint

• Drilling every lm



PU Injection ( in case of no waterproofing layer )



Deneff Seal Injection


Repair Plan for Vertical Joint

Drilling 30cm away from C/J 1m interval between hole.


PU Injection (in case of no waterproofing layer)


Deneff Seal Injection

Drilling Hole

Deneff Seal Injection

Deneff Seal Injection

Construction Result


POLY-AS Waterproofing System

The combination of a non-curing, self-healing, Poly-Rubber Gel with a durable, puncture resistant protection sheet makes Poly-as method the ultimate waterproofing solution for above grade below grade applications.


This waterproofing system combines Deneff seal (a flexible and adhesive non-curing polymer gel) with Deneff sheet.

Key Features and Effects

  • Can be applied in damp conditions
  • Self-healing ability
  • Easy maintenance
  • Reduce overall construction period
  • Application can be done in cold weather

Areas of Application

Civil structure – (Box-typed structures – underpass, subways, Cable/Electric power tunnels, E/J and C/J) Buildings – (Underground parking lots, roof top)

General Drawings for Above Ground Structures

1. Surface Preparation

2. Deneff-Seal Application

3. Deneff sheet Installation

4. Protection Board Installation

General Drawings for Underground Structures

Blind Side Waterproofing

This Pre-installed waterproofing layer ensures the complete adhesion against the poured concrete establishing the perfect blindside waterproofing system.


  • Uniform and consistent waterproofing performance
  • Maximize the bonding strength between the pre-installed waterproofing layer and the concrete structure
  • Can be applied to many substrates
  • Can be applied to wet conditions
  • Self sealing / Self healing ability
  • Easy maintenance
  • Shortens construction period (no curing time)
  • Good performance in low temperature


Green Roof System

This method is total waterproofing solution for green roof system which combines an adhesive and flexible non curing polymer gel with Eco root barrier sheet(made of copper) which keeps structures safe from plant roof penetration.

Eco-sheet (root barrier sheet)

  • Made of 99.9% pure copper, excellent surface hardness prevents root penetration.
  • Sheet overlaps are treated with copper tape keeping the integrity of the membrane.
  • Excellent corrosion resistant and antibacterial
  • Easy tailoring and installation

Eco Seal

  • Laitance removal is unneccessary
  • Can be applied in damp / wet condition
  • Self healing / Self sealing ability
  • Easy maintenance
  • Shortens construction period (no curing time required)
  • Application can be done in cold weather


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Restorative Waterproofing

An innovative repair system that effectively and completely restores a failed waterproofing membrane without any excavation of soil or break-up of concrete. Traditional leak repair methods only bandage leak temporarily and are costly. However, the repair system assures the complete restoration of the damages waterproofing layer and the blockage of the leaks at a low cost by injecting Deneff-Seal, a flexible adhesiveness and self sealing waterproofing material directly into the leaking areas.


  • One component, No mixing of chemicals
  • Permanent repair – stopping water leaks at their source
  • Remains as flexible gel – durable to vibration and continuous movement
  • Easy to store and transport

Areas of Application

  • Any leaking areas in above/below grade of concrete structure