4131WR
WPS RAWMAT™ BENTONITE TANKING
1
GENERAL

If you have pre-customised this work section using the "questions and answers" provided as part of the downloading process, it may be necessary to amend some clauses to suit the final project-specific version.

 

The section must still be checked and customised to suit the project being specified, by removing any other irrelevant details and adding project-specific details and selections.

 

This section relates to the application of Waterproofing Systems Ltd Rawmat™ pre-hydrated bentonite tanking system for basement foundation and vertical wall applications.

It is used:

Modify or extend the above description to suit the project being specified.

1.1
RELATED WORK

Refer to ~ for ~.

Include cross references to other sections where these contain related work.

Refer to 2242 BACKFILLING for back filling after installation of the tanking system, 7430 DRAINAGE or 7441 GROUNDWATER DRAINAGE for subsoil drainage to basement walls.

Documents
1.2
DOCUMENTS

Refer to the general section 1233 REFERENCED DOCUMENTS.  The following documents are specifically referred to in this section:

BRANZ BU 397

Waterproofing basements

Delete from the DOCUMENTS clause any document not cited.  List any additional cited documents.

The following are related documents and if referred to in the work section need to be added to the list of DOCUMENTS.

NZBC E2/AS1

External moisture

NZBC B2/AS1

Durability

BRANZ Good practice guide

Concrete floors and basements

1.3
MANUFACTURER/SUPPLIER DOCUMENTS

Manufacturer and supplier documents relating to this part of the work:
Rawmat™ Product Manual (3rd Edition October 2007)
Standard detailed drawings
BBA Certificate No. 97/3337 (2nd Issue)

 

Manufacturer/supplier contact details

Company:

Waterproofing Systems Ltd

Web:

www.waterproofing.co.nz

Email:

info@waterproofing.co.nz

Telephone:

09 579 1460

Hilton Boshard

021 - 773 762

 

hilton@waterproofing.co.nz

Nicola Yortt

021 - 457 953

 

nicola@waterproofing.co.nz

John Stallard

021 - 457 953

 

john@waterproofing.co.nz

It is important to ensure that all personnel on site have access to accurate, up to date technical information on the many products, materials and equipment used on a project.  In most cases individual products are not used in isolation, but form part of a building process.  Also a particular manufacturer's and/or supplier's requirements for handling, storage, preparation, installation, finishing and protection of their product can vary from what might be considered the norm.  Access to technical information can help overcome this potential problem.

Warranties
1.4
WARRANTY - MANUFACTURER/SUPPLIER

Provide a material manufacturer/supplier warranty:

20 years:

For materials

From:

Date of completion of the application

  • Provide this warranty on the manufacturer/supplier standard form (if not available then use the standard form in the general section 1237WA WARRANTY AGREEMENT)
  • Commence the warranty from the date of practical completion of the contract works.

Refer to the general section 1237 WARRANTIES for additional requirements.

Modify or expand the clause to suit project or manufacturer/supplier requirements, options include:

  • Modify the form to be used
  • Commence the warranty from the date of purchase (check with the manufacturer/supplier)

Waterproofing Systems Ltd issue warranties on the basis that installations comply with their specification requirements and their on-site Quality Control process has been completed.

1.5
WARRANTY - INSTALLER/APPLICATOR

Provide an installer/applicator warranty:

7 years:

For execution

Installer's warranty for the system under normal environmental and use conditions against failure.

  • Provide this warranty on the installer/applicator standard form (if not available then use the standard form in the general section 1237WA WARRANTY AGREEMENT)
  • Commence the warranty from the date of practical completion of the contract works.
  • Provide completed substrate readiness check sheet
  • Provide the completed quality control check sheets
  • Provide a PS3 for the system installed to main contractor

The Waterproofing Systems phone APP system allows all of the above to be completed
including site pictures taken which can be e-mailed directly.

Modify or expand the clause to suit project or installer/applicator requirements, options include:

  • Modify the form to be used
  • Commence the warranty from the date of installation (check with the installer/applicator
Requirements
1.6
QUALIFICATIONS WORKERS - MANUFACTURER / SUPPLIER REQUIREMENTS

Waterproofing work to be carried out by experienced and fully qualified applicators approved by Waterproofing Systems NZ Ltd to install the Rawmat Type P Bentonite system. Refer to 1270 CONSTRUCTION for additional requirements relating to qualifications.

Modify clause to suit specific industry rules or specific contractual requirements.

1.7
ACCEPTABLE PRODUCT/MATERIAL SUPPLIERS

Where a product or material supplier is named in SELECTIONS, the product/material must be provided by the named supplier.  Where more than one named supplier, any one of the named suppliers will be acceptable.

This clause is used to nominate a supplier or suppliers to supply materials.  It is not intended for nominating subcontractors which must be done in the specific conditions of contract applying to the work.

1.8
NO SUBSTITUTIONS

Substitutions are not permitted to any specified Waterproofing Systems Ltd system, or associated components and products.

1.9
PRE INSTALLATION MEETING

Main contractor to convene a meeting between the applicator, all associated trades, consultants and Waterproofing Systems Ltd to ensure all parties have reviewed the plans, detailed drawings and specifications and that all parties fully understand and know what is required for the effective performance of the system.

1.10
SPECIAL DETAILS

Where a standard detail does not exist, or if a standard detail cannot be applied, an approved alternative must be obtained from Waterproofing Systems Ltd before proceeding with the installation.

Performance
1.11
PERFORMANCE

 Accept the responsibility for the water tightness of the completed tanking system.

If Shotcrete is being used as confinement, contact Waterproofing Systems Ltd for a special specification and details.

1.12
PRESSURE RATING

Obtain a written assurance from Waterproofing Systems Ltd that the waterproofing system, comprising membrane and jointing methods, is capable of sustaining the designated water pressure head.  Refer to SELECTIONS for the designated water pressure head.

Where applicable confirm the designated water pressure head with the design engineer.  BituPROOF® is recommended for low level tanking & damp-proofing - away from known water sources such as lagoons, rivers and sea.  bituFLAME® is recommended for deep excavation where a full tanking system is required.  Bentonite is the premier and most secure tanking system available and is used when basement waterproofing is critical such as below the water table or in large/complex constructions where detecting membrane damage make the risks of using traditional waterproofing systems high.

Quality control and assurance
1.13
INSPECTIONS

~

Use this clause for parts of the work where;

Special arrangements are required for notification for inspections.

These inspections may include 'Hold Points' or 'Notification Points'.  Refer to 1232 INTERPRETATION & DEFINITIONS  for complete definitions.

Hold Point:

Work may not proceed until the work in question has been inspected.

Notification Point:

notify Contract Administrator, work may be observed or not, work may proceed.

or

the manufacturer/supplier is required to carry out inspections outside their normal activities and provide reports or other documents in support of the work carried out.

or

the Contractor is required to carry out or engage consultants to carry out inspections of parts of the work.  It will typically be expected that the person carrying out the inspections will be required to provide producer statements in support of the work carried out.

1.14
QUALITY ASSURANCE

Maintain quality necessary to assure that work is performed in accordance with this specification and the qualifying requirements of Waterproofing Systems Ltd.

Complete Quality Control sheets using the hard copy or Waterproofing system APP system which must be completed for each installation area.

2
PRODUCTS
Materials

Rawmat™ bentonite can be installed on compacted sub base, sheet piles, sacrificial shutters and on concrete substrates.  Rawmat™ can be installed onto precast panels and can also be installed on damp substrates or in inclement weather.

2.1
BENTONITE TANKING MEMBRANE

Rawmat™ Type P pre-hydrated high density bentonite membrane manufactured from a high quality sodium bentonite clay all marked with the manufacturer's mark.  Membrane to have minimum 7.9 kg/m² sodium bentonite.

Type P membranes are used in wall and floor applications. The Rawmat™ membrane self heals should a puncture occur reducing the risk of failures due to membrane damage.

2.2
WATERSTOP

Rawseal™ water stop (Rectangular CJ2025 profiles) manufactured from a high quality sodium bentonite clay all marked with the manufacturer's mark.

Select appropriate Rawseal™ water-stop for specific use.  Refer to Waterproofing Systems Ltd details for more information:

  • Rawseal™ CJ2025 for internal construction joints.
  • In salt water coastal applications or for contaminated sites Rawseal CJ2025 is suitable for all types of situations.  Contamination includes old landfill sites, industrial waste sites, volcanic and fertilised soils, saline conditions.
Accessories
2.3
NON RIGID PROTECTION BOARD

3mm plastic coreflute protection boards over lapped 50mm and taped closed fitted neatly through all internal and external corners fitted from the foundation base through to vertical and horizontal termination points sealed off with a termination bar.

2.4
DRAINAGE PROTECTION BOARD

Where drainage boards are specified they are installed continuously edge butted and sealed with bituBOND tape fitted against the coreflute boards down to the drain coil system.

Membrane has discharge channels providing a drainage system that prevents the gap from clogging up with finer soil particles.

3
EXECUTION
Conditions
3.1
DELIVERY, STORAGE & HANDLING OF PRODUCTS

Refer to 1270 CONSTRUCTION for requirements relating to delivery, storage and handling of products.

Use this standard generic clause and if appropriate add additional special requirements.

3.2
ROUTINE MATTERS

Refer to 1250 TEMPORARY WORKS & SERVICES for protection requirements.
Refer to 1270 CONSTRUCTION for requirements relating to defective or damaged work, removal of protection and cleaning.

Use this standard generic clause and if appropriate add additional special requirements.

3.3
PRE-INSTALLATION REQUIREMENTS
  • Review the architectural plans and specifications for the project against the site preparation.
  • Check materials are correct for the installation and comply with the requirements of Waterproofing Systems Ltd Rawmat™ Product Manual.
  • Check substrate work previously carried out and confirm it is of the required standard for this part of the work.
  • Do not start the Rawmat installation until completely satisfied with the substrate and that any remedial work identified has been made good before commencing the installation.
3.4
SITE INSTALLATION MEETING

The main contractor to convene a meeting between the applicator, and associated trades providing the substrate, drainage and compaction for the Rawmat system applicator.
Co-ordinate work to minimise the time membrane is left exposed. Agree detail drawings, emphasize concrete placement and confinement of both faces and all edges with no voids.

3.5
LAYOUT

If not detailed on the drawings, confirm the layout to suit site conditions and Waterproofing Systems Ltd specifications.  Pre-plan the work to keep the number of membrane laps to an absolute minimum.

3.6
DE-WATERING

Maintain water level minimum 300mm below the level of the work area during the progress of the tanking work and until protective loading coats and walls are complete and fully set.

Use this clause if there is water present.  Modify to suit the circumstances if it is not part of 2241 EXCAVATION.

3.7
DRAINAGE

Install certified drainage system to remove water from foundations.  Ensure drain is protected with a geotextile cloth to prevent from clogging with fines, and that it is correctly located.  Ensure the drain is kept 150 mm away from the membrane and 200mm below the foundation/wall construction joint and that a polythene or corflute sheet is used as a barrier between the bentonite and the drainage metal.

The drainage system should be designed to cope effectively with the anticipated volumes of water on the site.

Preparation
3.8
STORAGE

Store Rawmat™ membrane and Rawseal™ water-stops in the protective wrapping and away from heat and direct sunlight until use.  Return part rolls and part boxes to their wrapping until used again.

3.9
SUBSTRATE COMPACTION

Compact the under slab fill to 95% Proctor ensure the outer edges of the foundation are firm at all form work.

Rawmat™ can be used on either a compacted sub-base, blinding concrete, sheet steel piles or timber shutters, precast panels or excavated rock face substrate.

3.10
PILE PENETRATIONS

Where piles penetrate the over-site blinding or compacted sub-base, place Rawpaste mastic and Rawseal™ CJ2025 water-stop around perimeter of pile cap to dress piles.  Neatly cut the Rawmat™ membrane around the pile and turn up the face of the pile to cover the CJ2025 fillet as a minimum.  Place a fillet of Rawpaste mastic around the pile cap and extend out onto the Rawmat™ membrane.  Refer to Waterproofing Systems Ltd details.

Specify Black water-stops on contaminated sites or where salt water is present.

3.11
INSTALL RAWSEAL™ WATER-STOP REBATES

Water-stops must be located within a pre-formed rebate or nailed and held securely in place prior to pouring the concrete.  Rebate to be a minimum 50 mm from the rebar.

3.12
INSTALL RAWSEAL™ WATER-STOPS

Install Rawseal™ CJ2025 water-stop to all internal construction joints. Join lengths of water-stop by butting tightly and thumbing together to ensure a continuous water-stop is formed.

Specify Black water-stops on contaminated sites or where salt water is present.

Installation/application
3.13
WEATHER CONDITIONS

Rawmat™ can be installed onto wet substrates and during inclement weather including rain.  Ensure the membrane is not left exposed or in standing water.

3.14
INSTALLATION

Install Rawmat™ with rolls staggered.  Rolls to be laid out allowing for 100 mm side laps and 150 mm end laps.  Install with the light polyester scrim in contact with the concrete  substrate being waterproofed.  Stagger rolls to prevent lap build-up and ensure laps remain intact while placing the confinement over the top.

3.15
LAP TYPE P MEMBRANES

Peel back the grey non-woven fabric of the lower sheet in the overlap to give bentonite to bentonite contact in all laps.  Apply Rawpaste mastic at the overlaps to ensure an immediate seal is formed where hydrocarbon contamination is present in the site.

Care must be taken to ensure the laps are not separated.  Type P used under floor slabs when working on compacted sub-base applications.

3.16
FLOOR TO WALL JUNCTION

Extend the floor slab membrane 150 mm beyond the perimeter of the footing.  Protect this extended membrane from damage until floor-to-wall junction is installed and it can form a lap with the vertical membrane.

3.17
INSTALL RAWSEAL™ CJ2025

Prior to forming the floor-to-wall junction, join lengths of Rawseal™ CJ2025 to form a continuous length of fillet.  Then place Rawseal™ CJ2025 fillet at the toe of the wall on the horizontal membrane and push tightly into the concrete water-stop recess.  Refer to Waterproofing Systems Ltd specifications.

Specify Black water-stops on contaminated sites or where salt water is present.

3.18
INSTALL VERTICAL RAWMAT™

Install vertical Rawmat™ Type P working from the base of the wall.  Ensure sheet of Rawmat™ is placed over the CJ2025 fillet and extends 150 mm across the horizontal membrane.  Apply vertical Rawmat™ with the white woven geotextile outermost facing the backfill and the thin perforated scrim side against the concrete.  When installing onto precast panels, the membrane can be glued or mechanically fixed to Waterproofing Systems Ltd specifications.

 

When installing onto precast panels, block walls or insitu concrete and there is insufficient access behind the panel to manually form the floor to wall junction, contact Waterproofing Systems Ltd for specific installation instructions.  Ensure when the tilt slab panels that are seated on the shims, the bottom of the tilt slab panel is tightly pressure fitted onto the upper face of the Rawseal.  Make sure the lower face of the Rawseal waterstop is compressed onto the foundation water-stop recess surface forming continuous compression between the panel underside and the foundation surfaces. At any vertical termination points return the Rawmat type P back on its self 30mm this means the fleece back returns against the substrate ensuring the cut edge is facing down the substrate and sealed off.

 

Install wall membrane sheets horizontally around the structure.  Fix with Hilti nails and washers at 500 mm centres.  Nail 150 mm below top of the sheet.  Fix joint by additionally nailing through the joint.  Continue this fixing around the structure at this level before the next row of sheets is applied.  Ensure the nails do not fire through the membrane and only sufficient pressure is applied to hold the surface of the membrane in place.
To fix subsequent rows, fix the upper sheet, allowing it to overhang the lower sheet 100 mm minimum.  Fix joint by additionally nailing with Hilti nails and washers through the joint to secure.  End laps to be 150 mm minimum.

3.19
COVERING AND CONFINEMENT

To prevent the membrane from drying out or swelling prematurely during continuous inclement weather cover Rawmat™ membranes the following day with concrete or if this is not possible with DPC sheeting.

Confine horizontal installations with a minimum of 140mm reinforced concrete. Confine vertical installations with a cohesive backfill comprising sand or natural soil that can be compacted to a minimum 95% Proctor. Backfill material to have a minimum of 30% fines, and gravel or stones larger than 15 mm must not be used.  Concrete to be vibrated to ensure no voids.  Confinement of both faces of the Rawmat and termination of all edges must be achieved - no voids.  It is important the confining concrete does not form a slab curl condition at the perimeter edges, movement or cold joints.

Bentonite works through a mechanism of swelling (when in contact with water) under confinement.  It is important that in both horizontal and vertical applications that the membrane is adequately confined.  Note that when installing in hydrostatic situations, the engineer should specifically design the floor slab thickness/reinforcement to accommodate the anticipated hydrostatic pressure.

3.20
BACK FILL

Ensure the quality of the back fill is such that the Rawmat™ membrane is not damaged and it allows uniform compaction and confinement of the membrane.  Ensure backfill does not get behind the membrane during installation.  Place backfill in layers and compact to a minimum of 95% Proctor every 600mm, from bottom to top of the backfill compacted area which confines the Rawmat. Compaction to all areas is important including all edges and termination points.

Bentonite works through a mechanism of swelling (when in contact with water) under confinement.  It is important that in both horizontal and vertical applications that the membrane is adequately confined.  Where the quality of the backfill and its compaction is of the specified standard, protection boards are not required.

3.21
PROTECTION

Ensure the Rawmat™ membrane is not damaged during backfilling.  Where adequate backfill compaction cannot be achieved, provide confinement with a suitable rigid protection system.

Protection

Rigid protection board to be used where the quality of back fill is such that even confinement cannot be obtained.  Select from one of the following alternate protection sheet clauses.

3.22
PROTECT HORIZONTAL SURFACES

After laying is complete the membrane can be protected until the floor slab is poured by covering the tanking with a 50 mm layer of 15 MPa blinding concrete or DPC sheets.  This situation arises when there is an extended delay between the membrane installation and the placement of the floor slab or where vehicles and other construction machinery is being taken over the membrane.

3.23
INSTALL NON RIGID PROTECTION SHEETS - COREFLUTE BOARD

Neatly install coreflute boards with an overlap of 50mm and joints taped, mechanically fixing them to the vertical tanking from the foundation base to the termination bar locations to Waterproofing Systems Ltd requirements.

3.24
INSTALL PROTECTION SHEETS - DRAINAGE

Install vertical drainage in accordance with manufacturer's instructions.

  • Vertical drainage is installed against the 3mm coreflute boards.
  • Styrobeck Formflow polystyrene vertical drainage boards installed with edges tight butted.
  • Install a Bidim A14 Geotech cloth to the external face of the Formflow board beginning  at the  draincoil to termination point.

Form a suitable water collection and drainage tube (Draincoil or similar) at the foot of foundation, then fill with free draining stone and 25% grit sand fines around the draincoil followed by compactable fill (prior to fixing ensure compatibility with wall waterproofing system).

Completion
3.25
PARTIAL COMPLETION

As sections of the tanking are completed, arrange for inspection of the work before covering with protective sheets, walls, or slabs.  Complete the Waterproofing Systems Ltd Quality Control Sheets.

3.26
ACCEPTANCE

Arrange for an inspection of the completed work by Waterproofing Systems Ltd. Complete and issue to Waterproofing Systems Ltd, Quality Control sheets for issuing of the Materials Warranty.
Protect the membrane until completion of the contract works.

3.27
CLEAN UP

Clean up as the work proceeds.

3.28
LEAVE

Leave this work in a sound condition, free of any defect.

3.29
REMOVE

Remove debris, unused materials and elements from the site.

4
SELECTIONS

For further details on selections go to www.waterproofing.co.nz.
Substitutions are not permitted to the following, unless stated otherwise.

If substitutions are permitted modify the statement above, ensure the NO SUBSTITUTIONS clause from GENERAL is treated the same.
Select the options to suit the project and delete options not specified.

4.1
PRESSURE RATING

Designated water pressure head: ~ metres

Where applicable confirm the designated water pressure head with the design engineer.

Bentonite system
4.2
RAWMAT™ BENTONITE TANKING MEMBRANE

Location:

~

Supplier:

Waterproofing Systems Ltd

Type/brand:

Rawmat™

Membrane type:

Type P, for walls and floor slabs when working on sub-base substrates

4.3
RAWSEAL™ WATER STOPS

Location:

~

Supplier:

Waterproofing Systems Lt

Brand:

Rawseal™

Type:

Rawseal™ CJ2025, for internal construction joints

Select appropriate Rawseal™ water-stop for specific use.  Refer to Waterproofing Systems Ltd details for more information:
In salt water coastal applications or for contaminated sites, the Black range is required.

Accessories - protection
4.4
COREFLUTE PROTECTION BOARD

Location:

~

Supplier:

Waterproofing Systems Ltd

Type/brand:

Coreflute

Thickness:

3mm

4.5
DRAINAGE MEMBRANE PROTECTION BOARD

Location:

~

Supplier:

Styrobeck Plastics

Type/brand:

Formflow polystyrene 1200mm x 2400 board

Thickness:

100mm

DrainV has a fabric weight of approximately 100g/m².  Available in rolls 2m wide x 20m long.