Bauder UK Native Plug Plant Biodiverse Green Roof System, Pitched Roof.

Vegetation:

- Bauder UK Native Plug Plants

Supply and plant a mixture of Bauder supplied British native plug plants in accordance with the landscape designers or ecologists planting schedule and drawings (where provided). All operatives carrying out the vegetation installation should refer to the Bauder installation and establishment guidelines for vegetation plugs, which is available from Bauder Ltd.

• Supply form: Maximum of 60 trays per pallet

• Size: 4cm plugs - 104 per tray / 5-6cm plugs - 54 per tray

• Coverage: Refer to specification

• Saturated weight: Approx. 5Kg per tray

Planted into the growing medium at a rate of 20plants/m². The plant coverage rate should be increased to 25 plants/m² in areas subject to wind erosion i.e. corner zones, ridges, perimeters etc.Our Green Roof Technical Team provides a service whereby we will select the type of plants best suited to the building location, height of the roof, slope and orientation. This helps to ensure that the optimum mix is selected and reduces loss of individual species because of incorrect specification.

Plant trays should be lifted to roof level and unpacked immediately, or alternatively may be kept for a maximum of two days in cool covered storage prior to lifting to roof level. Spring and autumn are the most suitable times of year to plant the plugs. It is essential that both the growing medium and the plugs are thoroughly watered both prior to and immediately after installation. Plug plants will need to be kept moist for 10 weeks after installation.

Establishment Watering Requirements

Surface watering for the first 10 weeks following installation (to ensure the substrate remains moist to the touch). It is the responsibility of the roofing contractor to liaise with the main contractor/ building owner to provide water and ensure that the planted growing medium is thoroughly irrigated immediately after installation.

An adequate mains water supply of sufficient pressure must be available and operational prior to the plants being delivered and installed. Initial watering must be by surface mounted sprinklers. See the Bauder Watering Guide document for detailed information on watering requirements. Bauder Ltd accepts no responsibility whatsoever for the condition of installed planting that is not properly watered or irrigated following landscaping works.

Substrate / Growing medium

- Bauder Biodiverse Substrate (FLL Compliant):

Lightweight, free draining substrates designed as a growing medium for a range of different plant species. This FLL/GRO compliant substrate provides a free draining, growing medium for biodiverse green roof systems. Additionally, it provides aeration qualities with some inherent water retention.

• Material: Recycled crushed brick, expanded clay, shale, composted pine bark.

• Maximum Weight (saturated): ≤1,200kg/m3

• Typical supply weight: c. 950kg/m3.

• Water storage (by volume): 35%

• pH value: 6-8.5

• Bulk bag size: 1.25m3Small bag size: 25L

For roofs pitched 6° upwards, apply the substrate growing medium directly into the open cup of the reservoir board and then build up to the depth specified. Substrates are raked out to give an even coverage of the required depth after settlement.

Handle in the driest condition possible. Do not handle or install when wet or frozen.

Start by applying two equal layers, building up to the required maximum depth.

Gently firm each layer before spreading the next. Allowance should be made for any settlement that may occur. It is recommended that ‘measuring stick’ markers of the required depth be used around the roof area to ensure that a minimum acceptable thickness of growing medium is achieved.

Depending on size and access of the project the ‘substrate’ can be supplied by various methods i.e. tipper, silo lorry (pumping directly onto the roof area), Big bags, or sacks. Prior to costing this element of the installation, the ‘Bauder Approved Contractor’ must contact Bauder Ltd so that they may advise on the best solution on any specific contract.

Trellis Substrate restraint (inc. for all slopes above 16º): Provision must be made by the installing contractor for supplying and fabricating 25mm x 50mm untreated timber formed into a trellis frame that is supported at the base of the slope (resting against the protection layer). The trellis is to form a series of retaining grids 400mm square and used on all slopes between 16º - 25º. This trellis will provide initial retention until plant establishment and help prevent soil erosion. It will eventually rot away naturally.

Important note regarding alternative substrates:

Alternative substrates are not recommended for Bauder supplied planting.

Filter layer:

- Bauder Filter Fleece:

Fine mesh PP geotextile used in conjunction with Bauder substrates. Bauder Filter Fleece is designed to separate and contain Bauder substrates from the drainage element of the green roof system (for slopes 0-5°). It prevents fine material from being washed out of the substrate layer.Fleece joints should be overlapped 150mm. Fleece should not be taken over the top of drainage outlets.

A filter layer is not used over reservoir board on slopes 6° or above, where the reservoir board is directly filled with substrate growing medium. However, a separate strip of Bauder Filter Fleece must still be used to separate the growing medium from the vegetation barrier at perimeter abutments and around pipe protrusions, outlet inspection chambers etc. dressed up all upstands and around all protrusions to at least flush with the finished surface level. At abutments the Filter Fleece must be used to separate the vegetation/drainage barrier and substrate growing medium by extending it 500mm beneath the reservoir board and then bringing it up between these two items.

Upstands (soft landscaping): Extend up, between vegetation barrier and growing medium and trim flush with finished surface level.

Upstands (Hard landscaping): Extend to top of perimeter abutments and trim flush just below finished surface level.

• Weight (saturated): 0.125Kg/m2

• Pore size: 0.13mm.

• Thickness: 1mm.

• Roll size: 1 x 100m / 2 x 100m.

• Coverage: 100m² / 200m2.

• Water storage: None.

• Material: Polypropylene fleece.

Drainage/Water storage layer:

- Bauder Reservoir Board Drainage and Protection Layer:

Water storage and multi-directional drainage layer. Used on roofs 0-25° finished falls (the only suitable Drainage and Protection layers for slopes 6° upwards). Boards laid over the entire area to provide continuous drainage and increased water capacity for the vegetation.

Loose laid (open cups up) on to the Protection Layer (or WFRL on inverted roofs) over completed waterproofing ensuring that the rebated boards are properly interlocked to provide adequate anchorage prior to the soil being laid. The board cups can be filled with water to provide temporary loading against wind uplift prior to installing the remaining landscaping elements in accordance with the specification. In the event of any confusion concerning this item, Bauder Ltd should be contacted so that advice may be given.

Cut to fit closely around penetrations and outlets.

Roof slopes 6° upwards, a parapet wall or restraint kerb must be provided to support the water storage / drainage board at the base of the slope. This should be included within the deck construction and reference made within the waterproofing specification also. This in turn will restrain and stabilise the landscaping against imposed shear load forces.

• Size: 0.795m x 1.298m (rebates).

• Depth: 50mm / 75mm.

• Coverage: 1m².

• Water storage (when unfilled): 10L / 22.1L.

• Compressive strength: 25KN/m2 / 35KN/m2.

• Weight (substrate filled and saturated): 10.65kg/m² / 22.1kg/m2.

• Material: Expanded polystyrene.

Vegetation Barrier/Hard Edge/Fire Break:

- Vegetation Barrier (supplied by others):

For slopes below 10° only. (Roof slopes 10° upwards a hard edge should be supplied using paving slabs as an alternative to 20/40mm round river washed pebbles).

A vegetation barrier must be provided to all perimeters, abutments penetrations including protrusions i.e. man-safe posts etc. We recommend 20/40mm rounded river washed pebbles.

Stones/aggregates with sharp edges must not be used i.e. flint.

In accordance with current GRO guidelines, the specified barrier widths are as follows: -

• Minimum 300mm but increasing to 500mm at vertical walls with opening windows or doors or to abutments with opening rooflights.

• Every 40m, there is a 30mm high barrier constructed of non-flammable materials or a one metre wide strip of solid paving, gravel or pebbles.

• At all open drainage perimeters, drainage trim must be used to contain the vegetation barrier.

• Vegetation barrier removal or reduction of the recommended width: Pebble vegetation barriers function as a fire break between potentially flammable dry vegetation and abutting construction materials that are also potentially flammable, to prevent fire spreading. These can be seen as an aesthetic issue for smaller green/blue roof areas and for this reason some clients/designers choose to reduce this width or otherwise remove the barrier altogether.

The current barrier guidelines are set by the GRO codes of practice that Bauder follows and promotes. These are guidelines and not currently a legal requirement under British Standards or Building Regulations. However, not following these guidelines may affect an insurance claim in the unlikely event of a fire. Consequently, Bauder Ltd cannot accept liability for issues arising from non-compliance with the current GRO guidelines.

Protection layer:

- Bauder FSM 600 Protection Mat:

Heavy duty protection layer made from polyester and polypropylene fibres. Laid on the completed waterproofing to protect the completed waterproofing from damage (not required for inverted roofs).Normally installed under the entire green roof area but kept clear of all outlets and drainage trims. FSM mats should be lapped by 150mm at all joints. Loose laid. Laps to be sealed by lightly heating overlap area with a propane gas torch / hot air welding gun to melt the polypropylene fibres and then press seal the two fleece sheets together.

Sufficient protection fleece must be allowed for so that it may be installed to all abutment upstands and edge details, in accordance with the Bauder instructions. Extend to full height of the upstand and secure in place by using a lead or fabricated metal counter-flashing.

Should be trimmed well back from ALL outlets.

Openings in landscape restraint kerbs (where present - roof slopes above 5º), the protection layer should be cut away from the openings/ gaps to avoid impeding drainage.

• Width: 2m.

• Length: 30m.

• Thickness: 4mm.

• Coverage: 60m².

• Weight (saturated): 3.6kg/m².

• Material: Polyester and polypropylene fibre mix.

- Bauder Eco-Mat Protection Fleece

Lightweight protection layer made from recycled man-made fibres. Laid on the completed waterproofing to protect the completed waterproofing from damage (not required for inverted roofs).

Normally installed under the entire green roof area but kept clear of all outlets and drainage trims.

Eco-mat should be lapped by 150mm at all joints. Loose laid.

Sufficient protection fleece must be allowed for so that it may be installed to all abutment upstands and edge details, in accordance with the Bauder instructions. Extend to full height of the upstand and secure in place by using a lead or fabricated metal counter-flashing.

Should be trimmed well back from ALL outlets.

Openings in landscape restraint kerbs (where present - roof slopes above 5º), the protection layer should be cut away from the openings/ gaps to avoid impeding drainage.

• Width: 2m.

• Length: 30m.

• Thickness: 6mm.

• Coverage: 60m².

• Weight (saturated): 3.8kg/m².

• Material: 100% Recycled man-made fibre mix.

- Bauder Pro-Mat Protection Mat

Bauder's Heaviest duty protection layer made from recycled shredded tyres. Laid on the completed waterproofing to protect the completed waterproofing from damage (not required for inverted roofs, not for use with PVC waterproof membranes / Bauder Single Ply Thermofol PVC Roof system).

Normally installed under the entire green roof area but kept clear of all outlets and drainage trims.

Normally installed to provide access over waterproofing in heavily trafficked areas

Pro-mat should be lapped by 150mm at all joints. Loose laid. Where landscaping installation is not imminent, loose laps should be taped with gaffer tape to eliminate the trip hazard.

Sufficient protection fleece must be allowed for so that it may be installed to all abutment upstands and edge details, in accordance with the Bauder instructions. Extend to full height of the upstand and secure in place by using a lead or fabricated metal counter-flashing.

Should be trimmed well back from ALL outlets.

Openings in landscape restraint kerbs (where present - roof slopes above 5º), the protection layer should be cut away from the openings/ gaps to avoid impeding drainage.

• Width: 1.25m.

• Length: 10m.vegetation barrier and growing medium and trim flush with finished surface level.

• Thickness: 6mm.

• Coverage: 12.5m².

• Weight (saturated/dry): 4.3kg/m².

• Material: 100% recycled shredded rubber.

Bauder Biodiversity & Habitat Creation features: (roof slopes up to 10º only)

- Undulating Substrate:

Away from perimeters and doorways, undulate the substrate between 80-200mm dependant on average depth required (min depth ≥80mm).

- Stone Piles:

Small areas of clean, assorted stone in 1m² sized areas made from 20-200mm diameter stone, (ideally gathered from site) mounded in random piles no more than three stones deep. approx. 1 pile for 50m² of biodiverse roof. These provide valuable shelter for ground active invertebrates

- Sand Piles:

Small areas of clean sharp sand or builders’ ballast. Approximately 50-100mm deep covering areas of 2-3m², to be left free from planting or seeding. These are to be situated in sunny areas with low substrate depths (80mm)

1 sand pile for every 50m² of biodiverse roof. These provide basking areas and ground nesting habitat.

- Dead Wood Habitat:

Deadwood piles to be made from British native hardwood species (bark retained), ideally from trees removed locally or in the re-development works. Wood piles to be made from 8 -12 number of wood lengths. Wood to be between 100-200mm diameter and 600-1200mm in length. 8 to 12 lengths per pile. To be stacked no more than 350mm high and be secured in areas of high wind. One deadwood pile for every 50m² of biodiverse roof. These provide rotten wood habitat as they decay in sheltered and shaded areas, as well as nesting habitat.

- Dew Pools – Wet areas

Buglife approved wetland feature. Installed directly over the Bauder Drainage/Water storage layer. To be buried so that the edges are level with the surface substrates. The plastic pond itself should be filled with substrate which gradually slopes down to form a central hollow where water accumulates. One pool to be positioned for every 100m2 of roof area. Dew pools provide valuable wet, temporary ponds to provide breeding habitat and moist cavities.

- Insect habitat:

Buglife approved Insect Hotel, to be fixed in position by placing the base plate underneath the underlying substrate. Preferably placed in a south-facing position, where it will receive maximum sunlight, however, the most exposed/windy locations should be avoided.

Accessories:

Bauder AL150 Edge and Drainage Trim (to open perimeters at ridge and eave kerbs):

Perforated edge/drainage trim used to frame and contain the green roof build-up. AL150 is specifically for use within substrate based green roofs. AL150 must always be used in conjunction with the pebble vegetation barrier (below 10° only) / or hard edge (such as a paver).

Normally installed directly onto waterproofing, the drainage trims can be welded down using lengths of the waterproofing membrane. The trim is used to frame the green roof build up and should be completed and inspected prior to living material being delivered to site. See Bauder Green Roof Installation Guide for full details.

• Material: Aluminium

• Thickness: 1.5mm

• Trim height/width: 150mm

• Trim length: 2000mm

• Supply form: 2m lengths, Joint Sections and Corner Sections are also available.

Precautionary note:

when cutting metal, please ensure that appropriate tools and personal protection equipment are used.

- Retention Angle (supplied by others) - used behind a waterproofed castellated retention batten & perimeters/top of the slope (when Bauder Trims are not sufficient in height).

Purpose designed aluminium or stainless-steel perimeter retention angles, used to contain landscaping or pebble ballast when interfacing soft or hard landscaping. These retention angles are to be supplied and fabricated by others to the landscape architect’s requirements and incorporating drainage perforations where required.

Cutting: Neat, accurate and without spalling.

Junctions: Cut with a hacksaw to form 90º corners – mitre cut fixing arm.

Position: True to line and level. Smooth continuous lines.

Fabrication: Obtained from a specialist metal fabricating company. The metal should be regularly perforated on the vertical face to allow drainage, with drainage holes being 3mm-5mm maximum diameter. The top leading edge should be folded fully or at a right angle by a minimum of 20mm to eliminate the sharp edge.

Horizontal leg: For the base of the slope, in conjunction with the castellated retention battens - To be 200mm wide. Only the vertical section needs to be perforated.

For open perimeters/top of the slope - To be 200mm wide with 60mm diameter holes positioned and cut centrally along the fixing arm at a rate of 6/Linear metre.

Height: To be as landscaping build-up.

Installation: At the base of the slope, in conjunction with the castellated retention battens - The retention trims must be securely placed in front of the drainage gaps in the castellated retention kerb. The angle should be installed loose over the specified protection layer.

The angle should be installed loose over the specified protection layer.At open perimeters/top of the slope - The retention trims must be secured in place using the specified Bauder capping sheet/Waterproofing strips/flashing pieces (1000mm x 200mm size), bonded to the surface of the horizontal leg and set at intervals of 400mm between flashing pieces. The main capping sheet/membrane/waterproofing must be overlapped by a minimum of 100mm.

Hard edge (minimum 300mm width): The retention trims should be used in conjunction with the pebble vegetation barrier/hard edge.

Precautionary note: when cutting metal, please ensure that appropriate tools and personal protection equipment are used.

- Bauder ALU250 Inspection Chamber System:

The Bauder ALU250 Inspection Chamber is fabricated from a perforated aluminium sheet with an opening/lockable lid and is used for intensive and extensive soft landscaping, as well as ballasted inverted roofs. Install centrally over rainwater outlets. A simple on-site modification allows the unit to be used over outlets that are located close to wall or kerb abutments.

The Inspection Chamber is suitable for landscaping depths of less than 100mm. Where landscaping is deeper than 100mm, the 50mm or 100mm height adaptors can be added as necessary to achieve the required height to be level with or slightly proud of the surrounding landscaping.

Surround:

Using 20/40mm grade washed pebbles; the inspection chamber must be surrounded by a 500mm vegetation barrier to prevent unwanted growth obstructing the drainage system.

ALU250 Inspection Chamber

• Material: 1.5mm aluminium (2mm lid)

• Length: 250mm (chamber only)

• Width: 250mm (chamber only)

• Height: 100mm

• Weight: 950g

• Colour: Silver grey (RAL 9006)

ALU250 Height Adaptor 50mm

• Material: 1.5mm aluminium

• Length: 250mm

• Width: 250mm

• Height: 50mm

• Weight: 250g

• Colour: Silver grey (RAL 9006)

ALU250 Height Adaptor 100mm

• Material: 1.5mm aluminium

• Length: 250mm

• Width: 250mm

• Height: 100mm

• Weight: 450g

• Colour: Silver grey (RAL 9006)

- Jute Anti-Erosion Net (supplied by others)

Bio-degradable jute netting supplied by others. Installed over plug planted/seeded growing medium to prevent wind erosion until planting established.

Where the exposure of the roof is such that there is a risk of the substrate being subject to wind erosion, provision must be made to install biodegradable (Jute) erosion net (supplied by others) over the installed substrate, to prevent erosion until the plants are established. The net should be secured using bio-degradable pegs.

- Irrigation (supplied by others):

The need for irrigation in a biodiverse green roof system is dependent upon the client requirement for the visual appearance of the vegetation. If it is intended that the roof should have colour and interest for the longest period through the growing season, then irrigation will significantly aid in achieving this. Should the requirement be only to deliver biodiversity, then the provision of sufficient watering points at roof level to allow for only occasional watering in periods of prolonged drought can be considered sufficient. It is cheaper periodically to add water than to replace planting.

When the Bauder UK Native Plug Plant System is installed we recommend the provision of either a leaky pipe or drip line irrigation system.

Bauder recommend provision is made for an irrigation system to any substrate based green roof.Please note - continuous daily watering is neither recommended nor necessary and will only promote weeds and other unwanted plant species.

Advice and Supply of Irrigation Equipment

Access Irrigation Ltd is one of the country’s longest established irrigation specialists and has considerable experience in green roofs. They can provide irrigation advice on any Bauder project and can supply a wide range of irrigation products.

Please contact:-

Access Irrigation Ltd

Crick Northampton NN6 7XS

T: 01788 823811 F: 01788 824256

E: sales@access-irrigation.co.uk

www.access-irrigation.co.uk

Fertiliser:

- Bauder Xero Flor Organic Fertiliser (for on-going maintenance purposes only).

Fertiliser should ideally be applied during March/April, as it helps the plants to prepare for extreme weather conditions and flowering whilst also allowing the different species to gain sufficient nutrients without competing against each other.

Organic fertilizer can be obtained direct from Bauder in 25kg bags, which is sufficient for an area of 312.5m2 when applied at the recommended rate of 80g/m². Areas of up to 30m² may be applied using either a handheld spreader or strewn by hand from a bucket. Larger roofs should always be done using a trolley applicator, which can be purchased direct from Bauder. Always apply the fertiliser at the given rate written on the bag.

It is recommended that the fertiliser is lightly ‘watered in’ immediately after application, to avoid “burning” of the foliage, which may occur if fertilizer pellets settle on the leaves. Dung-based organic fertilizers should be avoided.

- Bauder Maintenance services:

Bauder Ltd offers a professional maintenance service using experienced green/blue roof technicians and would be pleased to provide an estimate for carrying out on-going maintenance. Please contact our green roof maintenance team on Tel: 01473 257671. Alternatively, the work can be contracted to experienced landscape contractors of your choice.