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Attenu8® System - Roofing System

Verified by manufacturer 11 days ago

Attenu8® Intensive Blue/ Green Roof System

Proteus Waterproofing Variant:

Roofing system.

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Application

Suitable for:

  • Intensive green roofs: Creates a finish for lawns and intensive specialist planting.
  • Semi-intensive green roofs.
  • Extensive green roofs and bio-diverse roofs: Designed to be self-sufficient and low maintenance, creating a natural habitat supporting birds, insects and invertebrates.
  • Biosolar roofs.
  • Blue roofs: Reduces and controls the peak rate of storm water discharge, and is engineered to attenuate water at roof level to alleviate the risk of flood at ground level.

Description

The Attenu8® System can be used in a range of areas dependent on project requirements, and can be built onto a range of different roof types.

It functions as a blue roof solution that temporarily stores and attenuates stormwater runoff, preventing downstream flooding while integrating seamlessly with green or bio-diverse roof finishes.

Adheres to the GRO Code of Practice for Green Roofs.

Features and benefits:

  • Allows independent design of underlying roof drainage to meet BS EN 12056:3 2000 without conflict, guaranteeing the roof drains at engineered rates.
  • Eliminates negative thermal performance from water cooling in inverted roofs, reducing insulation thickness and costs under BS 6229:2018 guidelines, while saving on build-up heights.
  • Mitigates flotation risk in inverted build-ups without extra ballast, enabling lower structural design weights and lower costs.
  • Works effectively with substrates laid to falls without reducing storage volumes, aligning with industry standards and insurer preferences (e.g., NHBC, Premier Guarantee, LABC) for reduced risk, and enabling retrofits on existing sloped roofs.
  • Provides additional protection via a secondary fully sealed membrane layer, reducing risk for critical structures like data centres or healthcare buildings.
  • Handles exceedance events by overflowing into external drainage as per BS EN 12056:3 calculations, avoiding incorrect flow rate assumptions in external systems.
  • Offers a fully joined-up insulated waterproofing and attenuation specification, achieving compliance for thermal, waterproofing, SuDS, living green roofs, and bio-solar photovoltaic systems, leading to 'right first time' designs and avoiding interface issues.
  • Aligns drainage and thermal calculations for cost-effective solutions within available build heights, preventing costly upgrades like vacuum insulation.
  • Provides single-point specification, design responsibility, and insured guarantee covering all elements, simplifying chains of responsibility and avoiding disputes.
  • Can be installed at any time of the year.
  • Achieves half 'drain-down' time, meeting hydraulic calculations and planning conditions.
  • Enables system re-use, aligning with London Plan ambitions.
  • Manages silt and debris effectively.
  • Easy to maintain per GRO and Ciria C817 guidance.
  • Life expectancy matches the waterproofing and building design life.
  • Contributes to BREEAM credits when combined with rainwater harvesting.
  • Reduces need for below-ground attenuation tanks, saving costs and basement space in urban environments.

Consists of:

  • Waterproofing.
  • Thermal insulation.
  • Water flow reducing layer.
  • Overflow control layer.
  • Water barrier layer.
  • Joint tape.
  • Protection layer.
  • Attenuation layer.
  • Attenuation filtration layer.
  • Moisture control layer.
  • Geotextile layer.
  • Growing medium.
  • Vegetation.
  • Outlets.
  • Flow rate control.
  • Overflow control.
  • Access chambers.
  • Fire breaks.
  • Edge retaining profile.
  • Slope retaining profile.
  • Accessories.

General information

Color

Other

Finish

Other

Material

Polyethylene

Polypropylene

Butyl

Stainless steel

Aluminium

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Shape

Other

Length

Bespoke

Width

Bespoke

Height

Bespoke

Warranty description

Other

Guidance for specification option:

Defects arising from lack of maintenance or abnormal use may fall outside of the cover of the Proteus Waterproofing guarantee.

Uniclass

Ss_30_40_30_07 Blue roof systemsPrimary
Ss_45_40_47_40 Intensive green roof systems
Ss_45_40_47_75 Semi-intensive green roof systems
Ss_45_40_47_28 Extensive green roof systems

CAWS

Q37/150 Blue roofs

Q37/110 Intensive green roofs

Q37/130 Extensive green roofs and biodiverse roofs

Q37/120 Semi-intensive green roofs

Q37/140 Biosolar roofs

Specification data - Blue roof systems

Classification data

Roof type

Cold.
Inverted.
Warm.
Other.

Guidance for specification option:

Insert drawing/ reference.

Substrate

Plywood.
Concrete.
Metal.
Cross laminated timber (CLT).

Manufacturer guidance

Consult manufacturer for details on substrate requirements.

Slope

Absolute zero.
Flat.
1:80.
1:60.

Waterproofing

Proteus Hot Melt®.

Guidance for specification option:

A tough and flexible compound made from a blend of SBS modified bitumen, synthetic rubber, polymers and other additives, used as the monolithic waterproofing element.

Proteus Pro-Felt®.

Guidance for specification option:

Consult manufacturer for details.

Proteus Pro-BW® Plus.

Guidance for specification option:

Liquid-applied roof waterproofing system for use on exposed, protected, inverted flat roofs, green roofs, blue roofs, podiums, balconies and walkways.

Proteus Cold Melt®.

Guidance for specification option:

A polyurethane two-part, elastomeric, cold liquid applied membrane, waterproofing system.

Protection layer

N/A.

Thermal insulation

Proteus Pro-Therm PIR.

Guidance for specification option:

Fibre-free rigid polyisocyanurate (PIR) insulation core faced with coated glass tissue on one side and bituminized glass tissue with polypropylene fleece on the other.

Proteus Pro-Therm XPS Plus.

Guidance for specification option:

For deck area insulation. 

  • Standard: To BS EN 13164.
  • Environmental: Zero ODP; <1 GWP.
  • Grade: 300/ 500/ 700 kPa at 10% compression.
  • Edges: Rebated.
  • Integral topping: None.
  • Design Lambda value: 0.028 W/m·K.

Proteus Pro-Therm EPS Plus 'Premium'.

Guidance for specification option:

For deck area insulation. 

  • Standard: To BS EN 13164.
  • Environmental: Zero ODP; <5 GWP.
  • Grade: 200 kPa at 10% compression.
  • Edges: Rebated.
  • Integral topping: None.
  • Design Lambda value: 0.031 W/m·K.

Proteus Pro-Therm HP PIR Plus.

Guidance for specification option:

Used either stand alone or with tapered or flat board insulation as a premium performance board, providing a slim solution for use on new and existing roofs with timber or concrete decks.

Proteus Pro-Therm VIP.

Guidance for specification option:

High performance vacuum sealed insulation panel with a microporous core which is evacuated, encased and sealed in a thin, gas-tight envelope.

Water Flow Reducing Layer/ Vapour Permeable Membrane

Proteus Low-K Water Reducing Layer.

Guidance for specification option:

Water flow reducing layer, for use in an Inverted or Protected Membrane Roof. Conforms to CEN 1506946.

Overflow Control Layer

Attenu8® Cell, 30 mm.
Attenu8® Geo Cell, 12 mm.

Manufacturer guidance

Structural attenuation cells designed for the attenuation of stormwater.

Protection

Attenu8® Protection Layer.

Guidance for specification option:

Attenu8® Protection Layer is a non-woven sheet composed of continuous filaments, mechanically bonded.

Secondary waterproofing layer

Attenu8® Aqua Wrap.

Guidance for specification option:

Heavy duty impermeable polyethylene geomembrane, used as an interim waterproofing layer to separate the main attenuation from the overflow mitigation zone.

Overlap

Attenu8® Aqua Wrap Double Sided Tape.

Guidance for specification option:

Double-sided polypropylene sealing tape.

Attenu8® Aqua Wrap Lap Tape.

Guidance for specification option:

Butyl mastic sealing tape.

Manufacturer guidance

Joints/ laps.

Attenuation

Attenu8® Cell, 30 mm.

Guidance for specification option:

Internal water volume: 28.4 L/m².

Attenu8® Cell, 50 mm.

Guidance for specification option:

Internal water volume: 36 L/m².

Attenu8® Cell, 85 mm.

Guidance for specification option:

Internal water volume: 76 L/m².

Attenu8® Cell, 125 mm.
Attenu8® Cell, 165 mm.
Attenu8® Cell, 205 mm.
Attenu8® Cell, 245 mm.
Attenu8® Cell, 285 mm.
Attenu8® Cell, 325 mm.
Attenu8® Cell, 365 mm.
Attenu8® Cell, 405 mm.

Filter membrane

Attenu8® Filtration Layer.

Guidance for specification option:

Non-woven sheet composed of continuous filaments, mechanically bonded.

Drainage layer

Proteus Pro-Living® DR20 Drainage Layer.

Guidance for specification option:

Cuspated moisture and flow retention layer for extensive and intensive green roofs, bio-diverse roofs and hard surface pedestrian areas.

Proteus Pro-Living® DR40 Drainage Layer.

Guidance for specification option:

Cuspated moisture and flow retention layer for extensive and intensive green roofs, bio-diverse roofs and hard surface pedestrian areas.

Geotextile filter fleece

Proteus Pro-Living® Filter Fleece.

Manufacturer guidance

Filter membrane.

Growing medium

Pro-Living® Substrate - Intensive.

Guidance for specification option:

Clean drainage and growth media designed for use in living roof applications.

Insert required depth.

Vegetation

Lawn/ turf (by others).

Guidance for specification option:

Consult manufacturer for details.

Landscaping (by others).

Guidance for specification option:

Consult manufacturer for details.

Frame

Proteus Pro-Living® Bio-Solar Mounting Device.

Manufacturer guidance

PV Ballasted frame system.

Fire breaks

Stone ballast (minimum 75 mm).

Guidance for specification option:

  • 300 mm: To open verges and edges.
  • 500 mm: To all vertical perimeters, all penetrations and all other entry points. To all doors, windows, opening rooflights, access hatches, and all other opening points.
  • 1000 mm: On large roofs, at 40 m intervals.

Edge restraints

Proteus Pro-Living® Drainage Trim.

Outlets

Proteus Aluminium Roof Outlet.

Flow Rate Control Layer

Attenu8® Flow Restrictor.

Guidance for specification option:

Safely controls the rate of water run-off, without overloading the roof structure.

Available 300 mm or 380 mm diameter.

Manufacturer guidance

Flow rate control.

Overflow

Attenu8® Overflow Device.

Guidance for specification option:

Safely controls the rate of water run-off, without overloading the roof structure.

Available 75 mm or 100 mm.

Manufacturer guidance

Overflow control.

Access

Attenu8® Diffuser/Access Chamber.

Guidance for specification option:

Blue roofs.

Proteus Pro-Living® Access Chamber.

Guidance for specification option:

Green roofs.

System accessories

Not required.
Proteus Pro-Living® Drainage Trim.
Pedestals.

Standard

GRO Code of Practice for Green Roofs.

Irrigation

-

Manufacturer guidance

Refer to Proteus Waterproofing technical department.

Sustainability data

Contains Red List materials

No

Material

Polyethylene
Polypropylene
Butyl
Stainless steel
Aluminium
Extruded polystyrene (XPS)
Expanded polystyrene (EPS)
Other

Literature

Product Data Sheet - Pro-Living® Blanket Sedum

Product Data Sheet - Pro-Living® Blanket Sedum

Product Data Sheet - Pro-Living® Blanket Wildflower

Product Data Sheet - Pro-Living® Blanket Wildflower

Product Data Sheet - Pro-Living® DR20

Product Data Sheet - Pro-Living® DR20

Product Data Sheet - Pro-Living® DR8

Product Data Sheet - Pro-Living® DR8

Product Data Sheet - Pro-Living® Filter Fleece

Product Data Sheet - Pro-Living® Filter Fleece

Product Data Sheet - Pro-Living® Sedum Plug Plants

Product Data Sheet - Pro-Living® Sedum Plug Plants

Product Data Sheet - Pro-Living® Seed Mix

Product Data Sheet - Pro-Living® Seed Mix

Product Data Sheet - Pro-Living® Substrate - Intensive

Product Data Sheet - Pro-Living® Substrate - Intensive

Product Data Sheet - Pro-Living® Wildflower Plug Plants

Product Data Sheet - Pro-Living® Wildflower Plug Plants

Product Data Sheet - Pro-Living® Wildflower Substrate

Product Data Sheet - Pro-Living® Wildflower Substrate

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