METHOD STATEMENT Sika®Drain-850 Geo 3/6/2016 / 1 / SIKA LTD, UK / ALEX BURMAN

WATERPROOFING

Method Statement UK

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TABLE OF CONTENTS 1 Scope 3

2 System Description 3

2.1 Uses 3 2.2 Characteristics / Advantages 3 2.3 References 3 2.4 Limitations 3

3 Product Information 3

3.1 Appearance / Colour 3 3.2 Shelf Life 4 3.3 Storage Conditions 4 3.4 Thickness 4 3.5 Unit weight 4 3.6 Packaging 4

4 Installation 5

4.1 General 5 4.2 Lapping 5

4.2.1 Lap at edge of roll (Flat Edge) 5

4.2.2 Lap on a cut edge (No Flat Edge) 6

4.3 Accessories 6 4.4 Fixing 7 4.5 Corners and Edges 7 4.6 Drainage Pipe 7

5 Legal Note 8

Method Statement UK

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1 SCOPE

This method statement describes the step by step procedure for installing Sika®Drain-850 Geo

2 SYSTEM DESCRIPTION

Sika®Drain-850 Geo is a heavy duty drainage and protection sheet produced from high density polyethylene

(HDPE) with dimples 10 mm high and a filtration layer of polypropylene (PP) geotextile bonded on the top.

2.1 USES

As a protection and drainage sheet for preformed sheet membrane waterproofing systems, liquid applied

membranes and with the Sika® White Box concept for waterproofing retaining walls and heavy duty

roofs/podiums.

2.2 CHARACTERISTICS / ADVANTAGES

High drainage capacity

High mechanical/impact resistance

Integral filtration layer

Resistant to all natural aggressive mediums in ground water and soil

Suitable for contact with soft water (aggressive to concrete)

Can be installed on damp and wet substrates

Sika®Drain-850 Geo forms a drainage channel in the space between structural elements and

backfill/soil/substrate to allow water to be drained away and, when linked to a maintainable land drain,

will prevent hydrostatic pressure acting against the structure

2.3 REFERENCES

EN 13252

2.4 LIMITATIONS

Sika®Drain-850 Geo is not resistant against exposure to permanent weathering and UV-light. When used in combination with PVC membranes, a separation (geotextile) must be used between the materials. Maximum installation depth: 10m.

3 PRODUCT INFORMATION

3.1 APPEARANCE / COLOUR

Black HDPE sheet with 10mm deep dimples and a black geotextile filtration layer bonded on the top.

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3.2 SHELF LIFE

The product does not expire during correct storage.

3.3 STORAGE CONDITIONS

Rolls must be stored in their original packaging, in cool and dry conditions. They must be protected from direct sunlight, rain, snow and ice, etc.

3.4 THICKNESS

10.0 (+/- 1.0) mm (EN ISO 9863-1)

3.5 UNIT WEIGHT

850 (+/- 5%) g/m2 (Dimpled Sheet) (EN 9864)

125 (+/- 20%) g/m2 (Geotextile)

3.6 PACKAGING

Roll size: 2.44 m x 12.50 m Weight: 975 g/m

2

Roll weight: ~30kg Consideration: Sika®Drain-850 Geo is delivered with 6 rolls packed vertically on a pallet (L x W x H): 1150mm x 850mm x 2550mm. Special offloading and storage space should be arranged to handle this height unit.

6ft (1.8m)

8ft (2.5m)

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4 INSTALLATION

4.1 GENERAL

If the installation depth is less than 2.44m (height of the rolls), the Sika®Drain-850 Geo may be rolled out

horizontally along the wall and fastened on the top. This method reduces the number of vertical laps required.

If the installation depth is greater than 2.44m (height of the rolls), the Sika®Drain-850 Geo may be rolled out

starting from the top to the bottom.

4.2 LAPPING

Adjacent sheets should overlap by a minimum of 60mm.

4.2.1 LAP AT EDGE OF ROLL (FLAT EDGE) The edges of each roll have a flat area with loose geotextile. One side is 60mm wide; the other is 45mm wide.

The lap is created by:

Wider 60mm Flat Edge

Narrower 45mm Flat Edge

1. Fold back the loose fleece on the wider (60mm) flat edge

2. Add a strip of double-sided tape (e.g. SikaProof FixTape-50) along the flat section

3. Lap the narrower flat edge onto the tape and press firmly

4. Double-sided tape, or similar, may be required to hold the loose fleece in place

5. Fold the loose fleece over and press firmly

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4.2.2 LAP ON A CUT EDGE (NO FLAT EDGE) If you need to create a lap on the edge of a roll that has been cut, there will be no flat edge to connect to, in which

case the recommended solution is as follows.

Note: Single-sided tapes can be used for sealing the laps as an alternative to the process above using double-sided

tape. Sika CD corner seal tape (115330) or Sika CD plaster tape (115331) single sided tapes can close the geotextile

at the laps.

4.3 ACCESSORIES

Description Dimensions Material Code Image

SikaProof FixTape-50

20mm x 20m 424701

Sika CD corner seal

10m 115330

Sika CD plaster tape

25m 115331

1. Peel back the geotxtile from the edge of one sheet (3 dimples is

approximately 60mm)

2. Lap the other sheet over the top, so that the dimples fit

together

3. Add a strip of double-sided tape over the fleece

4. Fold the loose fleece back over the lap and press into the tape

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4.4 FIXING

The product can be fixed along the top edge (above the waterproofing membrane) and

draped down the concrete face. Fix along the top with a nail and washer system every

250mm to prevent sagging or pulling at the nails.

Strips of double-sided butyl tape (such as SikaProof FixTape-50) can be used if

additional fixings are required across the main area of the sheet.

Do not nail through the main area of the sheet if placed against a waterproofing

membrane.

Sheets may also be temporarily propped to provide support whilst backfill is placed,

with props removed once backfill is deep enough to provide support.

Single-sided tape or a separate piece of geotextile should be used to close the top

termination edge to prevent material entry.

4.5 CORNERS AND EDGES

Care should be taken when forming Sika®Drain-850 Geo around sharp corners or edges to prevent the flow

channel becoming blocked.

For external corners, the geotextile may need to be cut and a tape applied to seal the geotextile once the sheet

has been folded. For internal folds no special treatment is required.

4.6 DRAINAGE PIPE

To continue the geotextile around the drainage pipe, peel back sufficient geotextile from the sheet and form over

the drainage pipe. Any excess dimple sheet can be cut back as required.

It is recommended to cover the pipe with crushed stones before covering with the geotextile. See the picture

about a typical installation.

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Figure 1 - Typical installation of Sika®Drain-850 Geo with SikaProof

5 LEGAL NOTE

The information, and, in particular, the recommendations relating to the application and end-use of Sika products,

are given in good faith based on Sika's current knowledge and experience of the products when properly stored,

handled and applied under normal conditions in accordance with Sika’s recommendations. in practice, the

differences in materials, substrates and actual site conditions are such that no warranty in respect of

merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship

whatsoever, can be inferred either from this information, or from any written recommendations, or from any

other advice offered. The user of the product must test the products suitability for the intended application and

purpose. Sika reserves the right to change the properties of its products. The proprietary rights of third parties

must be observed. All orders are accepted subject to our current terms of sale and delivery. Users must always

refer to the most recent issue of the local Product Data Sheet for the product concerned, copies of which will be

supplied on request.

FOR MORE SIKA®DRAIN-850 GEO INFORMATION: Please visit the Sika waterproofing website at www.sikawaterproofing.co.uk

Sika Ltd, UK

Waterproofing

Version given by

Alex Burman

Phone:

Fax:

Mail:

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