MT MStmt Ver2012(Jan) Page 1

METHOD STATEMENT

FOR

MEP TRAY

MODULAR EXTENSIVE GREEN ROOF

PREPARED BY

ELMICH PTE LTD

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METHOD STATEMENT

MEP TRAY

Modular Extensive Green Roof

1. Preparation of MEP Tray for Pre-planting

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1.1 Position Support Plate over MEP Tray reservoir

1.2 Custom fit Plate leaves no gap along tray wall that may allow

planting media to enter reservoir

1.3 Ensure Support Plate anti-root overflow outlet covers fit over

tray outlets

1.4 Insert capillary wicks into the slits found in 3 rows on the

Support Plate.

1.5 Hold capillary wick strip down against Support Plate along

tray wall and use a long flat tool (metal ruler or like tool) to

push a section through into reservoir

1.6 Similarly, hold the capillary wick against Support Plate outside

subsequent slit at and push another section of capillary

wick into reservoir. Repeat for remaining slits in the row.

1.7 Repeat 1.5 and 1.6 for remaining rows

1.8 Position custom-cut Geotextile Filter over Support Plate.

Steel ruler or like tool

Hold down strip here and push through slit with flat tool

Bottom of tray reservoir

Anti-root outlet covers

Groves and slits allow Custom-fit with no gap

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1.8 Ensure Geotextile Filter is in direct contact with capillary wicks

to enable water from reservoir to be transferred via capillary

action to planting medium above

1.8 Interlock 6 grid strips at their overlapping points to form

Confinement Grid

Slot ends into corresponding pockets along tray wall

Connect strips at interlocking points

Overflow outlets covered by anti-root covers of Support

Plate

Custom-cut Geotextile over Support Plate

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1.9 Slot Grid ends into corresponding pockets along tray walls to

prevent dislodgement

1.10 In-fill inorganic planting mix into tray until level with top of

Confinement Grid

2. PRE-PLANT IN NURSERY PRIOR TO INSTALLATION

2.1 Plant selected drought-tolerant extensive green roof plants.

2.2 Allow plant establishment in nursery environment for about 8

to 12 weeks prior to installation

1. PREPARATION OF ROOF SLAB

1.1 Mark out area of roof to be planted

1.2 Ensure fall is towards drainage outlet/s or over roof edge

1.3 Allow 500mm maintenance path around perimeter

Pre-planting in Nursery Inorganic Planting

Medium

Guide lines same height as trays

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1.3 Lay perimeter guide-lines (same height as trays) to aid in

alignment of trays

2. FIRST TRAY IN FIRST HORIZONTAL ROW

2.1 Ensure that all 6 polyurethane seals of Base Connector are

secure

2.2 Connect drainage pipes to base connector (upslope side

only for all trays in the 1st horizontal row)

2.3 Ensure that base connector directional arrows point down

slope

2.4 Attach rodent barriers to all 4 corners of tray

Down Slope arrows

Down Slope

All seals securely in place

Pipes connected to up slope side of Base

Connector only for trays in 1

st horizontal row

Insert Rodent Barriers

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2.5 Face downslope throughout installation

2.6 Install first tray at bottom left corner of grid

2.7 Tray directional arrows point down slope

2.8 Align left and front sides of tray with guide-lines

2.9 Insert overflow outlet points of tray into base connector

3. SUBSEQUENT TRAYS OF HORIZONTAL ROW

3.1 Install trays in horizontal row from left to right of grid

3.2 Repeat steps 2.1 to 2.7

1st Tray at Bottom left corner

Down Slope Arrows face dpwn slope

Down Slope

Insert tray outlet points into base connector

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Insert short Peg

Overlap right flange of neighbouring tray

Align holes for attaching Fastening Pegs

Twist to lock

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3.3 Overlap left flange of tray with right flange of neighbouring

tray

3.4 Align holes on tray flange for attaching Fastening Pegs

3.5 To link neighbouring trays - insert short Fastening Peg and twist

to lock

3.6 To prevent Base Connector and Tray Outlet points from

disconnecting - insert long Fastening Peg and twist to lock

3.7 Repeat for all trays in horizontal row

4. NEXT AND SUBSEQUENT HORIZONTAL ROWS

4.1 Install trays in horizontal row from left to right of grid

4.2 Connect drainage pipes to both ends of Base Connector

Insert long Peg Twist to lock

Down slope

Drainage pipes connected at both ends

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4.3 Overlap bottom flange of tray in subsequent row with top

flange of tray in front row

4.4 Overlap left flange of tray with right flange of neighbouring

tray

4.5 Repeat 3.4 to 3.7

4.6 Repeat 4.1 to 4.5 for all subsequent rows on the grid

Overlap right flange of neighbouring tray

Overlap top flange of bottom tray

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5. Inspection & Maintenance

5.1 Follow a routine inspection and maintenance regime

5.2 Weed away invasive unwanted growth

5.3 Prune as necessary

5.4 Apply fertilizer occasionally, if necessary