Simple to use, liquid applied waterproofing for concrete and steel bridge and trafficked decks


SERVIDEK® is a unique two component polymer modified bitumen, liquid waterproofing membrane. Cold applied by squeegee or trowel, the mixed liquid cures chemically to form a seamless, elastomeric waterproofing membrane for concrete and steel bridge and trafficked decks.

SERVIPAK® protection boards are robust, bitumen impregnated boards, designed for permanent protection of SERVIDEK®. The boards are laid into ‘wet’ SERVIDEK® liquid membrane to provide protection against damage from hot and cold applied finishes.


  • European Technical Approval (ETA) – CE marked with independently audited factory production control
  • BBA Certified – independent assessment
  • Damp surface tolerant - wide ‘weather window’ for application
  • Elastomeric - will accept cracking in substrates caused by deflection or shrinkage
  • Low temperature performance - adhesion and flexibility properties maintained in -40°C service conditions
  • Critical path - finishes can be installed 4 hours after waterproofing installation
  • Simple application by squeegee/trowel - no specialist application equipment
  • No priming - SERVIDEK® waterproofing applied directly to clean substrates
  • Robust SERVIPAK® Protection Boards - prevent membrane damage from following trades and asphalt laying equipment
  • Proven performance - over 25 years on road/rail bridges and trafficked decks.

Principal Applications

New and remedial waterproofing of:

  • Road Bridges
  • Rail bridges
  • Elevated trafficked decks
  • Car park roofs

System Components

SERVIDEK® – polymer modified bitumen liquid waterproofing membrane

SERVIPAK® – bitumen protection boards, available in 3 mm and 6 mm thicknesses

ARMOURTAPE™ E is a rubber/bitumen self adhesive tape with a bituminous facing. Used for taping and sealing butt joints between SERVIPAK® protection boards

BITUTHENE® Primer S2 is a solvent bitumen primer for use with ARMOURTAPE™, when taping and sealing butt joints in SERVIPAK® boards.


Concrete decks should be designed and built in accordance with BS EN 1992-1-1: 2004 and its UK National Annex.

SERVIDEK®/SERVIPAK® is satisfactory for use on trafficked decks subject to vehicular and pedestrian traffic.The system must be overlaid with a suitable wearing course, e.g. asphalt, concrete, paving slabs, block pavers, etc.

SERVIDEK®/SERVIPAK® can be used on concrete or steel substrates.



SERVIDEK®/SERVIPAK® should only be installed by contractors that have been trained by GCP in correct application procedures. SERVIDEK®/SERVIPAK® application ambient temperature range is between +4°C and rising and maximum +35°C . Substrate temperature should exceed the dew point by a minimum 3°C. Application outside this temperature range could result in shortened working life and harder application.

The application should not be made if rain or frost is imminent or in conditions where it is likely to freeze before the liquid membrane cures.

Application Equipment

  • Broom or airline
  • Sharp knife
  • Chalk and string line
  • 38 mm x 150 mm timber
  • Rubber bladed squeegee
  • Steel or rubber trowel
  • 100 mm roller or paint brush
  • Hot air gun or gas torch
  • Heavy hand roller

Surface Preparation

Concrete Surfaces

Shall be levelled and screeded to form a uniform surface. On hardening and after bleed water evaporation, the concrete should be trowelled to produce a hard dense surface free of screed marks and exposed aggregate. Finally, lightly texture the surface with a wooden float or equivalent.

Maximum deviation in surface profile shall be 10 mm over a 3 m gauge length and any abrupt irregularities over 3 mm shall be removed or filled with high strength repair mortar.

The concrete deck should be clean, and free from ice, frost, laitance, loose aggregate, oil, grease, moss, algae growth, dust and any other contaminants that could decrease adhesion between the concrete and SERVIDEK®.

Damp surfaces are acceptable but any surface water should be removed by sweeping or with air lances.

Green/fresh concrete - apply to green concrete only when necessary. If concrete curing compounds/membranes that could impair waterproof membrane adhesion have been used, test a sample of SERVIDEK® for adhesion to determine if removal is necessary. Finishes can be installed up to 30 days.

Steel Surfaces

Remove all rust, scale, oil, grease and other contaminants from steel surfaces by grit blasting. Where required, steel surfaces may be primed with a zinc/epoxy corrosion inhibitor. Contact GCP Technical Services for further details.



When the ambient temperature is below +10°C, storage at +20°C for several hours will ease mixing and application.

Mix both of the components throughly before adding them together. After mixing, pour all of the Part B (small tub) into the Part A and stir with a timber ‘paddle’ in a folding motion until a consistent colour, free from streaks, is obtained. Ideally this should take no longer than two minutes. Mix and use one unit at a time, applying the SERVIDEK® immediately once mixed. Pot life is approximately 20 minutes at +20°C.

Application of SERVIDEK®/SERVIPAK®

Pour the mixed SERVIDEK® on to the deck surface and spread with a squeegee at a rate of 10-12 m2/22.5 lit unit, depending on substrate surface and temperature.

Day Joints

Always leave a 50 mm leading edge of SERVIDEK® compound to enable subsequent overlapping. Seal the exposed edges of SERVIPAK® protection boards with SERVIDEK® compound. Commence work the following day by ensuring the 50 mm leading edge is clean and dry, then overlap with fresh SERVIDEK® compound.

SERVIPAK® protection boards must be laid while the SERVIDEK® compound is still wet and laid progressively to minimise applicator trafficking until the SERVIDEK® has cured. The boards must be close butt jointed to ensure continuous protection to the SERVIDEK®. Where gaps occur between boards, these must be filled with SERVIDEK® prior to applying ARMOURTAPE™ to all board joints.

Where SERVIPAK® boards abut the parapet, pipe bays or abutments they should be pre-measured, and accurately cut to size by incising with a sharp knife and breaking on edge. The joints between the SERVIPAK® boards should be dry and primed with Primer S2.

Apply primer in 100 mm wide bands with a brush or roller and allow to dry before applying self-adhesive ARMOURTAPE™ centrally over the joint. Careful application of heat will assist in promoting adhesion of the Armourtape™ at low temperatures.

For taping joints below cold applied finishes use PERM-A-BARRIER® Detail Membrane. See separate data sheet.

ARMOURTAPE™ must be firmly rolled with a lap roller along its length and at junctions to ensure continuity. It is advisable to seal the exposed edge of the SERVIPAK® boards at the end of each working period to prevent the ingress of moisture overnight, by tooling the SERVIDEK® compound against the exposed edge of the SERVIPAK® boards.

Minimum cure time for SERVIDEK®/SERVIPAK® is 4 hours, after which bridge surfacing or trafficable deck finishes should be applied as soon as possible. It is good practice to ensure that the SERVIPAK® boards are fully bonded to the SERVIDEK® by firmly rolling with a heavy hand roller before final application of deck finishes.

Repairs To Damaged SERVIDEK®/SERVIPAK®

Minor repairs:

Eg. stone penetration through membrane and protection board.

Cut a section of new SERVIPAK® protection board a minimum of 50 mm beyond the damaged area. Using this section as a template, position over the damaged area and cut around the template through the SERVIPAK® . Remove the damaged SERVIPAK® and debris or damaged section of membrane. Mix and apply fresh SERVIDEK® and reinstate the new section of protection board. Apply S2 primer and ARMOURTAPE™ to lap the SERVIPAK® repair patch. A heated spatula/trowel can be used to remove the damaged board.

Major repairs:

Repeat the procedure for minor repairs, ensuring a minimum 50 mm SERVIDEK® to SERVIDEK® lap is achieved before replacement boards are laid.

Where extensive damage or contamination has occurred it is necessary to remove all damaged SERVIDEK® and SERVIPAK® from the deck by heating and scraping off.

Apply fresh SERVIDEK®/SERVIPAK® as detailed above for minor repairs

Expansion/Movement Joints

GCP provide a range of joint systems for buried movement joints in bridge and trafficked decks. The range summary is given in the table below, for full technical details refer to separate product data sheets.

GCP Product Movement Joint Type Maximum Movement Range
SERVISEAL® Type B Extruded PVC ±5mm (10 mm total)
SERVISEAL® Type B Extruded PVC with steelreinforcing plate ±10mm (20 mm total)
Colflex HN Flexible band bedded with our Multitek epoxy adhesive ± 25% of joint width (total 50% of joint width)

Suitable Overlays/Wearing Courses

Full thickness overlays can be laid 30 days after the waterproofing is installed. SERVIDEK®/SERVIPAK® is designed to be self - protecting during the installation of all conventional bridge and trafficked deck structure overlays and wearing courses, including:

  • Mastic asphalt to EN 13375: 2004
  • Gussasphalt
  • Coarse bituminous mixture (CBM) to EN 13375: 2004
  • Reinforced concrete
  • Pre-cast concrete paving slabs on bedding or pads
  • Stone ballast (2 x 6mm SERVIPAK® protection boards only)

Asphalt should be laid on SERVIDEK®/SERVIPAK® at a minimum placement temperature of +145°C and a maximum placement temperature of 185°C. In the event of ambient application temperature exceeding +30°C it may be necessary to restrict machine placement of asphalt finishes to cooler periods of the day.

NBS Specification Clause

Refer to Clause J31/130.

Health and Safety

Read the product label and Safety Data Sheet (SDS) before use. Users must comply with all risk and safety phrases. SDSs can be obtained from GCP Applied Technologies or


SERVIDEK® 22.5 litre pack (Part A & B combined)
Coverage 10-12 m2 per mixed pack
Palletisation Part A - 18 x 20.47 kg buckets per pallet
Part B - 72 x 4.5 kg buckets per pallet
Storage Under cover in original sealed containers above +5°C and below +27°C
Shelf life 12 Months
SERVIPAK® 3 3mm x 2m x 1m (2 sq m) - weight 8.8 kg/board (100 boards/pallet)
SERVIPAK® 6 6mm x 2m x 1m (2 sq m) - weight 21 kg/board (50 boards/pallet)
Storage SERVIPAK® may be stored outside but should be kept flat on original pallets
ARMOURTAPE™ E 75 mm x 20 m roll - 7 rolls/carton - 16.8 kg per carton
BITUTHENE® Primer S2 5 litre and 25 litre drums (Coverage - 9-11 m2 per litre)
Palletisation 5 litre - 156 drums per pallet
25 litre - 28 drums per pallet
Ancillary Products*  
BITUTHENE® Mastic 4.5 litre can - weight 6.5 kg/unit
SERVISEAL® Type B 230 mm wide PVC extrusion for buried expansion joints.
Supplied in 15 m rolls - 25 kg/roll
BITUSTIK™ 4000 Double sided tape 150 mm x 12 m rolls - 6 rolls/carton - 21 kg/carton
Colflex HN Buried movement joints - see separate data sheet

*These products are not within the scope of BBA certificate 04/4173 SERVIDEK/SERVIPAK Trafficked deck waterproofing system.

Physical Properties

Property Typical Value Test Method
Capacity to bridge cracks (fatigue resistance) at-30°C Pass EN 14224: 2010
Water-tightness Pass EN 14694: 2005
Bond strength to support 0.2 MPa EN 13596: 2004
Bond strength of overlay to the assembled system 0.2 MPa N 13596: 2004
Adhesion to damp, 7 day old concrete No significant change vs. dry, 28 day old concrete control EN 13596: 2004
Resistance to shear 0.03 N/mm2 EN 13653
Compaction resistance (CBM asphalt) Pass EN 14692
SERVIDEK®-Materials in contact (Change in mass) Water (WA) −1%
Alkali (Al) −1.3%
EN 14223
SERVIDEK®-Materials in contact (Resistance to static loading) Water (WA) L4
Alkali (Al) L4
Electrical resistivity > 3 x 1010 Ohm.m BS 903/C2

All declared values shown in this data sheet are based on test results determined under laboratory conditions and with the product sample taken directly from stock in its original packing without any alteration or modification of its component parts. | United Kingdom customer service: +44 (0) 1480 478421

We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

SERVIDEK and SERVIPAK are trademarks, which may be registered in the United States and/or other countries, of GCP Applied Technologies Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

© Copyright 2023 GCP Applied Technologies Inc. All rights reserved.

This document is only current as of the last updated date stated below and is valid only for use in the United Kingdom. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2023-11-09