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Download METHOD STATEMENT Sikaplan  WP 1100 sheet   STATEMENT Sikaplan  WP 1100 sheet membrane Waterproofing systems for basements ... i.e. drainage system,

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  • METHOD STATEMENT Sikaplan WP 1100 sheet membrane Waterproofing systems for basements and other below ground structures MARCH 2014 / 2

    ND VERSION / SIKA SERVICES AG / HANS-JOERG STICH

    TEMPLATE FOR LOCAL ADAPTION

  • Method Statement Engl./Corporate/Translation template

    Sikaplan WP 1100 e.g. template for local adaption

    Feb.2014, 1st draft

    Basement waterproofing

    2/43

    CONTENT

    1. Scope .......................................................................................................................................................... 3

    2. System decription ....................................................................................................................................... 3

    2.1 Design- and construction requirements

    2.2 Sheet membrane systems for basement waterproofing

    2.3 Membrane installation

    3. Products ............................................................................................................................................................. 6

    3.1 Sikaplan WP 1100 sheet waterproofing membranes

    3.2 Ancillary products

    4. Installation ................................................................................................................................................. 10

    4.1 General Sikaplan WP membrane installation procedure

    4.2. Waterproofing details on horizontal and vertical areas

    5. Methods of thermoplastic weldings of sheet membranes.19

    6. Quality control of welded seams..20

    7. Cleaning and inspection of completed work22

    8. Protection of installed waterproofing..22

    9. Proposals for Bill of Quantities...24

    10. Standard details..33

  • Method Statement Engl./Corporate/Translation template

    Sikaplan WP 1100 e.g. template for local adaption

    Feb.2014, 1st draft

    Basement waterproofing

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    1 SCOPE

    This Method Statement describes the step by step procedure for installation of the Sikaplan WP 1100-series Sheet

    Waterproofing Membranes and Sika Waterbar AR/DR waterstop product range, which are both all based on

    plasticized PVC and used for waterproofing of basements and other below ground structures against groundwater.

    2 SYSTEM DESCRIPTION

    Basements and other below ground structures usually need to be watertight to some degree according to their

    function and use.

    Waterproofing works are therefore required to prevent water ingress and leaks into the structure and also to

    protect the structure itself against the harmful influences of aggressive groundwater or seawater.

    Highly flexible single layer Sikaplan WP waterproofing membranes, or if required for even higher performance and

    security, a double layer system can protect a structure from damp soil, percolating water and groundwater under

    hydrostatic pressure.

    In situations with leaks through a sheet waterproofing membrane system caused by mechanical damage to the

    membranes, single or double layer systems, the water can underflow laterally and spread uncontrolled between the

    installed membrane system and the structure. However, a compartment system formed by welding the membrane

    system with waterstops and combined with control and injection ports / hoses provides the possibility of control and

    repair by injection if required at any time after completion and throughout the service life.

    Additional advantages of membrane waterproofing systems are that they are fast to install, and they

    require minimal substrate preparation, plus the installed membrane system has high crack bridging

    abilities. Any successful waterproofing system requires detailed design and specification by the

    responsible design engineer prior to the membrane installation works being carried out on site.

    The structure should be designed and built in such a way that the Sikaplan WP waterproofing

    membrane system can adequately fulfil its function during its long service life. Installation must only

    be performed by Sika trained and experienced Sikaplan WP sheet membrane waterproofing

    contractors. The site personnel must always be specifically trained in the correct welding Procedures for

    the Sikaplan WP sheet membranes.

  • Method Statement Engl./Corporate/Translation template

    Sikaplan WP 1100 e.g. template for local adaption

    Feb.2014, 1st draft

    Basement waterproofing

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    2. 1 DESIGN- AND CONSTRUCTION REQUIREMENTS:

    The main criteria that have to be considered for the correct design and installation of the Sikaplan WP

    flexible sheet membrane systems for waterproofing basements and other below ground structures are

    the:

    type and function of the structure

    waterproofing of structures in open cut excavation, or against secant pile-, or diaphragm walls

    circumference of the waterproofing required of the level of waterproofing and its terminations

    type and design of the retaining walls

    piled foundations and the pile cap location

    lowering of groundwater level during construction (sump and pumping methods)

    condition of the substrate to be waterproofed

    thermal insulation details and requirements

    dimensions of the structure (length, width, depth)

    groundwater levels (max., min., average, immersion depth of structure)

    condition of groundwater (aggressive water, salt water, polluted water)

    expansion joint details and design

    construction phases construction/day work jointing schedule of structure

    requirements for a single, or double-ply waterproofing system with compartments and vacuum control

    All elements protruding from or penetrating through the waterproofing membrane and cast into the

    concrete, i.e. service and other pipe penetrations , structural steelwork and anchors, shafts etc. should

    only be made of corrosion-free steel (i.e. stainless V2A or V4A steel), or other non-corroding materials.

    Where necessary these elements should be designed with flanges in order to allow watertight sealing

    around them with the membrane system.

    In order to avoid any damage to the installed membranes and to ensure their proper function, the

    following requirements must be met:

    the structure must be designed to minimise movement due to temperature, settlement and concrete

    shrinkage, contraction etc.

    reinforcement bars in the concrete should be min. 30 mm below the surface

    all steel elements should be stainless, or anticorrosive materials (i.e. cast iron, V2A, V4A steel quality,

    aluminium)

    the surface of the substrate being waterproofed should be smooth and uniform to avoid puncturing the

    membrane under the future influence of hydrostatic pressure

    2.2 SHEET MEMBRANE SYSTEMS FOR BASEMENT WATERPROOFING

    The installation procedure for the waterproofing membranes depends on the:

    excavation i.e. open- cut with free access to the external walls, or internal retaining walls

    project design requirements

    damp soil contact, percolating water, or water under hydraulic pressure

    immersion depth below normal groundwater level

    selected membrane type and its fixing methods

    selected waterproofing approach, i.e. drainage system, waterstop system, active control system

    Drainage systems

    Waterproofing against damp soil contact and percolating water using single layer

    membranes without welded compartments. This system is not suitable for use

    against water under hydrostatic pressure.

    Waterstop systems Waterproofing against damp soil contact and percolating water, plus water under

    hydrostatic pressure, produced from a combination of single layer membranes and

    waterstops-forming compartments (the most common standard sheet

    waterproofing membrane based solution).

    Active control system Waterproofing against water under hydrostatic pressure, combined with double

    layer membranes and waterstop compartments (allows highest security of water

    tightness - surveillance with vacuum testing).

  • Method Statement Engl./Corporate/Translation template

    Sikaplan WP 1100 e.g. template for local adaption

    Feb.2014, 1st draft

    Basement waterproofing

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    The following installation instructions are divided into single operations, that may or may not all be applicable

    according to the type and requirements of each project. The operational sequences must then also be defined

    according to the specific project design and the construction requirements.

    2.3 MEMBRANE INSTALLATION SEQUENCES

    Single layer and double layer membrane systems

    Open cut with free access to external walls:

    without retaining walls

    with retaining walls

    (apart from the structure)

    Installation sequence of the membrane is in two phases:

    1. lining below the basement slab

    cast in place concrete structures (slab, walls, roof)

    2. lining at walls and below ground roofs

    Internally without access to external walls:

    diaphragm walls

    driven or cast pile walls

    Installation sequences of membrane in one, or two phases:

    lining below basement slab and at retaining walls

    cast in place basement, wall- and roof structure

    Subject to any other specific local requirements, the selection of the right Sikaplan WP membrane thickness is made

    according to the ant

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