Description

Bauder WB Native Wildflower Blanket Biodiverse Green Roof System, Flat Roof.

Lightweight extensive biodiverse green roof vegetation blanket providing instant greening of a roof with a mixture of approximately 44 species of wildflowers. The blanket is installed on a minimum 80mm of substrate and meets the growing demand for native species vegetation to satisfy the requirements of BREEAM (Building Research Establishment Environmental Assessment Method) or a biodiversity strategy.

Key features:

  • Fully FLL and GRO-compliant systems.
  • Buglife-approved.
  • Provides valuable ecological habitats.
  • 44 species of British native wildflowers within the blanket meet BREEAM requirements.
  • Height of system typically 170–220 mm (green roof elements only)
  • Approximately 13.5 L/m² of water retention within the drainage board.

Benefits:

  • Instant visual effect from pre-grown blanket.
  • Assists in meeting a biodiversity action plan (BAP).
  • Improves Sustainable Drainage System (SuDS) capacity of the roof.
  • Environmentally friendly, peat-free product.
  • System helps mitigate flooding.

General information

Uniclass 2015

Ss_45_40_47_09 Brown roof systemsPrimary

CAWS

Q37/130 Extensive green roof

Specification data - Brown roof systems

Product Reference

Bauder WB Native Wildflower Blanket Biodiverse Green Roof System, Flat Roof

Waterproofing

Bauder Total Green Roof System Roof Covering System (specified in J41)

Bauderflex Green Roof System (specified in J41)

Bauder Single Ply Thermofol PVC Roof system (specified in J42)

Bauder Single Ply Thermoplan T Flexible Polyolefin Roof system (specified in J42)

Bauder LiquiTEC Cold Liquid Applied Roof System (specified in J31)

Bauder Bakor790-11 Hot Melt Rubberized Bitumen Roof Coating System (specified in J31)

Protection layer

Bauder FSM 600 Protection Mat

Heavy duty protection layer made from polyester and polypropylene fibres. Laid on the completed waterproofing to protect from damage. (NB: Not required for inverted roofs).

Bauder Eco-Mat Protection Fleece

Lightweight protection layer made from 100% recycled man-made fibres. Laid on the completed waterproofing to protect from damage. (NB: Not required for inverted roofs).

Bauder Pro-Mat Protection Mat

Bauder’s heaviest duty protection layer made from recycled shredded tyres. Laid on the completed waterproofing to protect from damage. Do not use over PVC waterproof membranes (i.e. Bauder Single Ply Thermofol PVC Roof system). (NB: Not required for inverted roofs).

Drainage/ water storage layer

Bauder DSE40 Drainage and Protection Layer

HDPE 40mm depth water storage and multi-directional drainage layer. Roofs pitched between 0-5°.

Bauder Reservoir Board Drainage and Protection Layer

Water storage, multi-directional drainage layer available in two depths 50mm or 75mm. Roofs pitched between 0-25°.

Filter layer

Bauder Filter Fleece

Fine mesh PP geotextile used in conjunction with Bauder substrates. Laid over the Bauder drainage/water storage layer, preventing fine material from being washed out of the substrate layer.

Substrate/ growing medium

Bauder Biodiverse Substrate (FLL Compliant)

Recycled crushed brick, expanded clay, shale, composted pine bark. Minimum depth 80mm, preferred depth 100mm+.

Vegetation

Bauder WB Native Wildflower Blanket System

British-grown vegetation blanket, containing a broad mix of UK native wildflower species.A British grown vegetation Blanket designed for use on green roofs. Containing a broad mix of UK native wildflower species. Suitable to be laid on Bauder (FLL Compliant) Biodiverse substrate.

Maximum Slope

25°

Accessories

See 'Options' below and insert requirements.

Standard product features

Vegetation:

- Bauder WB Native Wildflower Blanket System

A British grown vegetation Blanket designed for use on green roofs. Containing a broad mix of UK native wildflower species. Suitable to be laid on Bauder (FLL Compliant) Biodiverse substrate.Bauder WB Native Wildflower Blanket contains a broad mix of British Wildflowers grown in substrate on a coir carrier. The natural fibres of the coir carrier promote the rapid rooting of the blanket into the substrate. The product is installed over Bauder, FLL Compliant Biodiverse Substrate (see Product Data Sheet). The vegetation is a mix of hardy Wildflowers, annuals and herbs. The vegetation is cut back in the summer prior to delivery to reduce plant stress.

  • Maximum Saturate Weight: ≤30kg/m².
  • Thickness: 30-40mm
  • Typical Supply Size: 1m x 2m
  • pH Value: 6.5-7
  • pecies: up to 40 wildflower species + 4 grass species (≤10%) (The species mix is adjusted from time to time, please contact Bauder Technical for further information).

Lay as soon as possible on delivery.

Growing medium condition: Immediately prior to planting, the whole system should be thoroughly watered to ensure that the water storage/drainage board is filled and the substrate growing medium saturated.

Blankets should be laid diagonally or perpendicular to the slope of the roof. Stagger joints, butt together or slightly overlap to prevent gaps. Blankets are not to be stretched. Thoroughly water using surface sprinklers immediately after installation and substrate dressing, ensuring that the blankets and substrate are fully saturated before moving on to the next area.

On steeper slopes the blankets can be additionally pegged with bio-degradable pegs (supplied by others) to secure them until they root, but these must not penetrate further than the depth of the substrate growing medium.

WB Native Wildflower Blanket should only be layed by skilled operatives. Care should be taken not to traffic the blanket during or after installation. See Bauder’s Green Roof Installation Guide for full details.

Establishment Watering Requirements

For Bauder WB Native Wildflower blankets, it will be necessary to keep the blanket substrate damp for a period of at least 10 weeks during the period of vegetation establishment. It should be established at tender stage, who should carry out this task and that they have all relevant information available regarding watering requirements.

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 planting being delivered and installed. Initial watering must be by surface mounted sprinklers. For larger roofs this will likely entail more than one watering point at roof level.

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: 1.25m3
  • Small bag size: 25L

Normally installed above a Filter Fleece and drainage board product. 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.

Loose laid over the drainage layer. The fleece should be taken up the sides of the substrate between the substrate and drainage trim or pebble margin. Fleece joints should be overlapped 150mm. Fleece should not be taken over the top of drainage outlets.

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.

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.

  • Weight (saturated): 0.125Kg/m2
  • Pore size: 0.13mm.
  • Thickness: 1mm.
  • Roll size: 1 x 100m / 2 x 100m.
  • Water storage: None.
  • Material: Polypropylene fleece.

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.

- Irrigation (supplied by others):

Bauder would strongly recommend irrigation on a wildflower roof. However, this 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 WB Native Wildflower Blanket System is installed we recommend the provision of a 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

Product Options

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.
  • Thickness: 6mm.
  • Coverage: 12.5m².
  • Weight (saturated/dry): 4.3kg/m².
  • Material: 100% recycled shredded rubber.

Drainage/Water storage layer:

- Bauder DSE40 Drainage and Protection Layer:

HDPE water storage and multi-directional drainage layer. Used on roofs 0-5° finished falls. Loose laid (open profile cup up) on to the Protection Layer (or WFRL on inverted roofs) over completed waterproofing to provide continuous drainage within hard and soft landscaping. It is primarily used where the load is moderate to high, such as extensive and intensive green roofs. Its compressive strength makes it suitable beneath paving laid on sand/cement or gravel bedding or within planter beds.

Boards are to be interlocked by a minimum of one profile cup and all board joints staggered. The ‘X’ stamped impression on the highpoint of the cup moulding indicates where boards overlap. Cut to fit closely around penetrations and outlets.

  • Size: 1.04m x 2.03m (2.1m2).
  • Nominal wall thickness: 2mm
  • Depth: 40mm.
  • Coverage: 2m² (approx.).
  • Water storage: 13.5L.
  • Filling capacity: 21L.
  • Compressive strength: 80KN/m2 empty / >1000KN/m2 aggregate filled.
  • Weight (saturated): 15.3kg/m².
  • Material: 100% recycled high-density polyethylene.

The drainage/water storage board also provides a suitable base surface for building concrete or brick kerbs/walls. The specified infill haunching should be installed over the board to the required depth of cover, poured directly into the profile cup of the board. These should be constructed to provide an adequate support for the raised masonry planters.

- 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: 10L / 22.1L.
  • Compressive strength: 25KN/m2 / 35KN/m2.
  • Weight (saturated): 10.65kg/m² / 22.1kg/m2.
  • Material: Expanded polystyrene.

Accessories:

- Bauder AL150 Edge and Drainage Trim:

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: 150mm
  • Dimensions: 150 x 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.

- 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)

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.

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