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

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Bauder Ltd

A native wildflower blanket for a biodiverse green roof system on flat roofs.

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+44 (0)1473 257671 Website

Application

Suitable as part of a biodiverse green roof system on flat roofs.

Description

A native wildflower blanket for a biodiverse green roof system on flat roofs. 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 80 mm 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.


Features and benefits:

  • 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.
  • 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

Color

Green

Shape

Rectangle

Square

Height

-

Manufacturer guidance

Height of system typically 170–220 mm (green roof elements only).

Warranty description

-

Manufacturer guidance

A comprehensive range of guarantee options are available. Please contact your local Bauder Area Technical Manager for more information.

Uniclass

Ss_45_40_47_09 Brown roof systemsPrimary

CAWS

Q37/130 Extensive green roof

Product range

Landscaping Systems

Specification data - Brown roof systems

Protection

-

Protection layer

BauderGREEN FSM 600 protection mat.

Guidance for specification option:

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 150 mm 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: 2 m.
  • Length: 30 m.
  • Thickness: 4 mm.
  • Coverage: 60 m².
  • Weight (saturated): 3.6 kg/m².
  • Material: Polyester and polypropylene fibre mix.

BauderGREEN SV 600 protection and moisture mat.

Guidance for specification option:

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 150 mm 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: 2 m.
  • Length: 30 m.
  • Thickness: 6 mm.
  • Coverage: 60 m².
  • Weight (saturated): 3.8 kg/m².
  • Material: 100% Recycled man-made fibre mix.

BauderGREEN GGM 6 rubber protection mat.

Guidance for specification option:

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 150 mm 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: 1.25 m.
  • Length: 10 m.
  • Thickness: 6 mm.
  • Coverage: 12.5 m².
  • Weight (saturated/ dry): 4.3 kg/m².
  • Material: 100% recycled shredded rubber.

Root barrier

20/ 40 mm rounded river washed pebbles.

Guidance for specification option:

For slopes below 10° only.

A vegetation barrier must be provided to all perimeters, abutments penetrations including protrusions i.e. man-safe posts etc.

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 300 mm but increasing to 500 mm at vertical walls with opening windows or doors or to abutments with opening rooflights.
  • Every 40 m, there is a 30 mm 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.

Paving slabs.

Guidance for specification option:

For roof slopes 10° upwards, a hard edge should be supplied using paving slabs as an alternative to 20/ 40 mm round river washed pebbles.

Manufacturer guidance

Supplied by others.

Moisture control

-

Drainage layer

BauderGREEN DSE 40 drainage board.

Guidance for specification option:

PE-HD 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: 1.04 x 2.03 m (2.1 m2).
  • Nominal wall thickness: 2 mm.
  • Depth: 40 mm.
  • Coverage: 2 m² (approximately).
  • Water storage: 13.5 L.
  • Filling capacity: 21 L.
  • Compressive strength: 80 kN/m2 empty/ >1000 kN/m2 aggregate filled.
  • Weight (saturated): 15.3 kg/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.

BauderGREEN WSP 75 / 50 reservoir board.

Guidance for specification option:

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 stabilize the landscaping against imposed shear load forces.

  • Size: 0.795 x 1.298 m (rebates).
  • Depth: 50 mm/ 75 mm.
  • Coverage: 1 m².
  • Water storage: 10 L/ 22.1 L.
  • Compressive strength: 25 kN/m2/ 35 kN/m2.
  • Weight (saturated): 10.65 kg/m²/ 22.1 kg/m2.
  • Material: Expanded polystyrene.

Filter membrane

BauderGREEN FV 125 filter fleece.

Guidance for specification option:

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 150 mm. 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 500 mm beneath the reservoir board and then bringing it up between these two items.

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

Substrate

BauderGREEN SUB-BM UK biodiverse substrate.

Guidance for specification option:

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

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): ≤1200 kg/m3.
  • Typical supply weight: c. 950 kg/m3.
  • Water storage (by volume): 35%.
  • pH value: 6–8.5.
  • Bulk bag size: 1.25 m3.
  • Small bag size: 25 L.

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 (including for all slopes above 16º): Provision must be made by the installing contractor for supplying and fabricating 25 x 50 mm 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 400 mm square and used on all slopes between 16–25º. 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.

Waterproofing

Bauder Total Green Roof System Roof Covering System.

Bauderflex Green Roof System.

Bauder Single Ply Thermofol PVC Roof system.

Bauder Single Ply Thermoplan T Flexible Polyolefin Roof system.

Bauder LiquiTEC Cold Liquid Applied Roof System.

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Manufacturer guidance

To be fully specified separately.

Vegetation

Bauder WB Native Wildflower Blanket System with Bauder Xero Flor Organic Fertilizer.

Guidance for specification option:

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: ≤30 kg/m².
  • Thickness: 30–40 mm.
  • Typical Supply Size: 1 x 2 m.
  • 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.

Manufacturer guidance

Fertilizer 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 25 kg bags, which is sufficient for an area of 312.5 m2 when applied at the recommended rate of 80 g/m². Areas of up to 30 m² 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 fertilizer at the given rate written on the bag.

It is recommended that the fertilizer 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.

Maximum Slope

5°.

Accessories

Not required.

BauderGREEN AL 150 edge trim.

Guidance for specification option:

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: 1.5 mm.
  • Trim height: 150 mm.
  • Dimensions: 150 x 2000 mm.
  • Supply form: 2 m 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.

BauderGREEN KS ALU 250 inspection chamber.

Guidance for specification option:

BauderGREEN KS ALU 250 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 100 mm. Where landscaping is deeper than 100 mm, the 50 mm or 100 mm 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/ 40 mm grade washed pebbles; the inspection chamber must be surrounded by a 500 mm vegetation barrier to prevent unwanted growth obstructing the drainage system.


BauderGREEN KS ALU 250 inspection chamber:

  • Material: 1.5 mm aluminium (2 mm lid).
  • Length: 250 mm (chamber only).
  • Width: 250 mm (chamber only).
  • Height: 100 mm.
  • Weight: 950 g.
  • Colour: Silver grey (RAL 9006).


BauderGREEN KS AE 50 chamber height adaptor.

Guidance for specification option:

  • Material: 1.5 mm aluminium.
  • Length: 250 mm.
  • Width: 250 mm.
  • Height: 50 mm.
  • Weight: 250 g.
  • Colour: Silver grey (RAL 9006).

BauderGREEN KS AE 100 chamber height adaptor.

Guidance for specification option:

  • Material: 1.5 mm aluminium.
  • Length: 250 mm.
  • Width: 250 mm.
  • Height: 100 mm.
  • Weight: 450 g.
  • Colour: Silver grey (RAL 9006).

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