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Bauderflex Roof System Reinforced Bitumen Membrane Inverted Roof Covering System Self-Adhered (with Torch-on Capping Sheet)

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Bitumen inverted roof system, incorporating inverted insulation and torch-on bitumen capping sheet, with self-adhered bitumen underlayer.

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Application

Suitable for a variety of applications on both new build and refurbishment projects and can be used in warm, cold and inverted roof scenarios.

Description

Bitumen inverted roof system, incorporating inverted insulation and torch-on bitumen capping sheet, with self-adhered bitumen underlayer. Bauderflex Roof System is suitable for a variety of applications on both new build and refurbishment projects and can be used in warm, cold and inverted roof scenarios. Includes the option of using a root resistant cap sheet, making this waterproofing system suitable for green roof situations.


Bauder Inverted Roof systems should be ballasted/ landscaped to prevent wind uplift and/ or floatation. Type, thickness, weight of landscaping should be agreed with manufacturer per bespoke project basis.


Meets BBA certification 10/4744. Bauderflex can meet current UK Building Regulations Part B for external fire protection and can feature torch-free and safe to torch installation on combustible details.


Features and benefits:

  • Capping sheets with tensile strength up to 800 N/50mm.
  • Withstands climatic extremes of over 100⁰C variation.
  • Patented self-adhesive DUO products. The "DUO" lap technology ensures thorough sealing of lap joints, even in lower temperatures.
  • Expandable graphite fire retardant reduces spread of flame.
  • Heavy duty, robust and extremely tough.
  • Service life in excess of 30 years as stated in BBA certificate 10/4744.
  • Resistant to European climatic conditions.
  • Membrane resists impact and tearing.
  • Can satisfy requirements of Part B of Building Regulations.


Torch-Free/ Safe to Torch Zone Detailing:

Bauder was the first manufacturer to pledge its support to the Safe2Torch initiative, introduced by the National Federation of Roof Contractors (NRFC) in July 2017. The torch-free detailing designs specifically deliver secure and safe installations in the vicinity of combustible construction materials located on, or connected to, the roof such as timber substrates or upstands; abutments to cladding, roof tiles, slates or thatch; or debris such as dry leaf material that is at risk from ignition.


Torch-free detailing can be integrated into all bituminous waterproofing solutions to give versatile, safe installation techniques for all roof types, site conditions and budgets.

The waterproofing flashing should be turned up by at least 150 mm around features such as rooflights, parapets and service pipes passing through the roof, detail work to upstands, edge details, flashings, etc. The membrane should not be taken up in one piece. Consult manufacturer for further information.


Features and benefits of Torch-Free/ Safe to Torch Zone Detailing:

  • Complete range of self-adhesive bitumen membranes.
  • Installation follows industry best practice and conforms to BS 8217: 2005.
  • 4.2 mm-thick elastomeric KSO SN and KSO P-SN cap sheets.
  • Hot air welding of membrane laps in the torch-free zone.
  • Can comply with Building Regulations Approved Document B – Fire Safety.
  • Manufactured to BS EN 13707: 2004 Reinforced Bitumen Membrane Sheets.
  • Reduces risk of fire caused by installation.
  • Practical solution so that installation programme times are achievable.
  • Robust waterproofing without compromising system longevity.

General information

Color

Brown

Grey

Material

Bitumen

Shape

Rectangle

Length

15 mm

Guidance for specification option:

Underlayer.

7.5 mm

Guidance for specification option:

Capping sheet.

Width

1 mm

Height

2 mm

Guidance for specification option:

Underlayer.

4.2 mm

Guidance for specification option:

Capping sheet.

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_30_40_30_71 Reinforced bitumen membrane inverted roof covering systemsPrimary

CAWS

J41/10 Reinforced bitumen membrane warm deck roof covering

J41/110 Built-up reinforced bitumen membrane warm deck roof covering

J41/120 Built-up reinforced bitumen membrane inverted roof covering

J41/130 Built-up reinforced bitumen membrane cold deck roof covering

Product range

Built-Up Bituminous Systems

Specification data - Reinforced bitumen membrane inverted roof covering systems

Preparation

-

Horizontal work

Activator-Primer (Canister) APR01 - Black.

Guidance for specification option:

Synthetic rubber resin-based primer, developed to provide the necessary preparation of substrates prior to the installation of self-adhesive and torch-applied membranes. The spray application offers improved film thickness speed of application (by up to 50% over roller applied products) and quick drying in a matter of minutes.

  • Coverage: Approx. 96 g/m² (300 mm-wide spray one coat, 196 g/m² two coats). Two coats may be required for very porous substrates.
  • Application temperature: +5 to +30°C.
  • Drying time (at 10°C): 5–10 minutes.
  • Colour: Black.
  • Recoat time if left exposed: Four hours.
  • Suitable substrates: Oriented strand board (OSB); plywood; timber; concrete; lightweight concrete or cementitious materials; metal; Bauder self-adhesive underlayers; existing asphalt and bitumen membranes; polyisocyanurate (PIR) insulation.
  • Non-suitable substrates: Mica finished surfaces (e.g. KSD FBS); Laminated paper-foil faced insulation; expanded polystyrene (EPS) or extruded polystyrene (XPS) insulations; BauderROCK or mineral wool insulation; BauderGLAS or cellular glass insulation; copper; thermoplastic waterproofing membranes.

Manufacturer guidance

Contact manufacturer to confirm substrate suitability, if required.

Skirtings and vertical work

As 'Horizontal work'.

Waterproof covering

-

First layer

-

Type

BauderTEC Sprint DUO.

Guidance for specification option:

A technically advanced self-adhesive SBS elastomeric bitumen underlayer with “DUO” lap technology to ensure thorough sealing of lap joints, even in lower temperatures. The product features a glass fleece reinforcement for strength and stability.

The product benefits from cleaner, safer and faster installation than traditional torch-applied membranes.

  • Width: 1 m.
  • Length: 15 m.
  • Thickness: 2 mm.
  • Weight: 2.5 kg/m².
  • Surface: Top: Foil; Bottom: Peel off release film covering self-adhesive bitumen.
  • Reinforcement: 120 g/m² glass fleece.
  • Cold bending test: -30°C.
  • Softening point: >100°C.
  • Tensile strength: Length >1000 N/50 mm; transverse >1000 N/50 mm.
  • Elongation at break: Length >2%; transverse >2%.

Manufacturer guidance

Self-adhesive, peel off release film, foil faced, 2 mm thick.

Attachment

Self-adhered.

Top layer

-

Type

PYE PV 200 S4.

Guidance for specification option:

Torch-applied, high performance, elastomeric bitumen, mica finished capping sheet, 4.2 mm-thick. Features a spunbond polyester reinforcement to allow the finished product to cope with structural movement without fracture. Its mica finish means that it has no integrated UV protection, therefore only suitable for applications where it will be covered with inverted insulation or hard landscaping such as pavers or promenade tiles.

  • Width: 1 m.
  • Length: 10 m.
  • Thickness: 4.2 mm.
  • Weight: 5 kg/m².
  • Surface: Top: Mica; Bottom: Thermofusible polyethylene.
  • Reinforcement: 250 g/m² recycled spunbond polyester.
  • Cold bending test: -25°C.
  • Softening point: >100°C.
  • Tensile strength: Length >800 N/50mm; transverse >800 N/50mm.
  • Elongation at break: Length >35%; transverse >35%.

K4E, Brown.

Guidance for specification option:

Torch-applied, high performance, elastomeric bitumen, mineral finished, capping sheet, 4.2 mm-thick. Features a spunbond polyester reinforcement to allow the finished product to cope with structural movement without fracture, and a mineral finish to provide protection against UV degradation.

Expandable graphite fire retardant is also incorporated to reduce spread of flame.

  • Width: 1 m.
  • Length: 7.5 m.
  • Thickness: 4.2 mm.
  • Weight: 5.5 kg/m² (Charcoal Grey); 5 kg/m² (Grey Slate, Brown).
  • Surface: Top mineral chippings.
  • Bottom: Thermofusible polyethylene.
  • Reinforcement: 250 g/m² spunbound polyester.
  • Cold bending test: -30°C.
  • Softening point: >110°C.
  • Tensile strength: length >800 N/50mm; transverse >800 N/50mm.
  • Elongation at break: length >40%; transverse >40%.

K4E, Charcoal Grey.

Guidance for specification option:

Torch-applied, high performance, elastomeric bitumen, mineral finished, capping sheet, 4.2 mm-thick. Features a spunbond polyester reinforcement to allow the finished product to cope with structural movement without fracture, and a mineral finish to provide protection against UV degradation.

Expandable graphite fire retardant is also incorporated to reduce spread of flame.

  • Width: 1 m.
  • Length: 7.5 m.
  • Thickness: 4.2 mm.
  • Weight: 5.5 kg/m² (Charcoal Grey); 5 kg/m² (Grey Slate, Brown).
  • Surface: Top mineral chippings.
  • Bottom: Thermofusible polyethylene.
  • Reinforcement: 250 g/m² spunbound polyester.
  • Cold bending test: -30°C.
  • Softening point: >110°C.
  • Tensile strength: length >800 N/50mm; transverse >800 N/50mm.
  • Elongation at break: length >40%; transverse >40%.

K4E, Grey Slate.

Guidance for specification option:

Torch-applied, high performance, elastomeric bitumen, mineral finished, capping sheet, 4.2 mm-thick. Features a spunbond polyester reinforcement to allow the finished product to cope with structural movement without fracture, and a mineral finish to provide protection against UV degradation.

Expandable graphite fire retardant is also incorporated to reduce spread of flame.

  • Width: 1 m.
  • Length: 7.5 m.
  • Thickness: 4.2 mm.
  • Weight: 5.5 kg/m² (Charcoal Grey); 5 kg/m² (Grey Slate, Brown).
  • Surface: Top mineral chippings.
  • Bottom: Thermofusible polyethylene.
  • Reinforcement: 250 g/m² spunbound polyester.
  • Cold bending test: -30°C.
  • Softening point: >110°C.
  • Tensile strength: length >800 N/50mm; transverse >800 N/50mm.
  • Elongation at break: length >40%; transverse >40%.

Manufacturer guidance

Not for use with green roof systems.

Attachment

Torch applied.

Detail work

-

Flashings

Not required.

Bauder GRP Trim.

Guidance for specification option:

GRP roof edge Trim for use with Bauder bituminous roof systems. Available colours of either grey or black and a choice of profiles to suit the requirements of most projects.

Bauder Aluminium Termination Bar.

Guidance for specification option:

Natural finish aluminium alternative to a lead counterflashing for use at upstand details to give protection to the top edge of the waterproofing. It should be restricted to use on upstands where a chase cannot be cut into the wall.

Bauder GRP Termination Bar.

Guidance for specification option:

Black glass reinforced plastic (GRP) alternative to a lead counterflashing for use at upstand details to give protection to the top edge of the waterproofing. It should be restricted to use on upstands where a chase cannot be cut into the wall.

Skirtings and upstands

Not required.

Bauder LiquiFIBRE Detailing Kit.

Guidance for specification option:

Fast curing waterproofing resin containing fibre reinforcement that can be used for detailing awkward shapes or inaccessible areas where using LiquiDETAIL is impractical. PMMA-based resin that requires a catalyst and is solvent, isocyanate and halogen free.

Bauder LiquiDETAIL.

Guidance for specification option:

Cold liquid applied fast curing waterproofing resin that can be used on upstands and details. PMMA-based resin that requires the addition of catalyst to trigger curing and is solvent, isocyanate and halogen free.

Welted drips

Required.

Guidance for specification option:

Insert requirements.

Not required.

Cover strips

Required.

Guidance for specification option:

Insert requirements.

Not required.

Ancillary items

Required.

Guidance for specification option:

Insert requirements.

Not required.

Insulation

-

Type

Bauder JFRI PREMIUM+ Inverted Insulation.

Guidance for specification option:

Insert required thickness, 85–240 mm in 5 mm increments.


Designed specifically for inverted roof applications.

  • Type: High-performance, rigid expanded polystyrene (EPS) insulation boards.
  • Facing: Unfaced.
  • Colour: Grey.
  • Nominal weight: 30 kg/m³.
  • Standard board size: 1215 x 1215 mm (including 15 mm rebate).
  • Thermal conductivity: Declared 0.031 W/m·K; design 0.031 W/m·K (may vary, dependent on thickness specified).
  • Design load compressive strength: 0.20 N/mm² with 10% nominal compression.
  • Ozone depletion potential (ODP): Zero.
  • Global warming potential (GWP): <5 kg CO2 Eq./kg.
  • Recyclability: 100%.


Consult manufacturer's literature for further details.

Bauder JFRI PREMIUM (300) Inverted Insulation.

Guidance for specification option:

Insert required thickness, 90–240 mm in 5 mm increments.


Designed specifically for inverted roof applications.

  • Type: High-performance, rigid expanded polystyrene (EPS) insulation boards.
  • Facing: Unfaced.
  • Colour: White.
  • Weight: 40 kg/m³.
  • Standard board size: 1215 x 1215 mm (including 15 mm rebate).
  • Thermal conductivity: Declared 0.033 W/m·K; design 0.033–0.035 W/m·K (may vary, dependent on thickness specified and application).
  • Design load compressive strength: 0.30 N/mm² with 10% nominal compression.
  • Ozone depletion potential (ODP): Zero.
  • Global warming potential (GWP): <5 kg CO2 Eq./kg.
  • Recyclability: 100%.


Consult manufacturer's literature for further details.

Bauder XPS (300) Inverted Flatboard.

Guidance for specification option:

Insert required thickness.


  • Type: High performance rigid extruded polystyrene insulation boards.
  • Facing: Smooth self-finished.
  • Density: 30 kg/m³.
  • Standard board size: 1250 x 600 mm.
  • Board thickness: 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 100 mm, 120 mm, 140 mm.
  • Thermal conductivity: 30 mm: 0.034 W/m·K; 40–50 mm: 0.035 W/m·K; >50 mm: 0.036 W/m·K.
  • Compressive strength: 0.30 N/mm².
  • Ozone depletion potential (ODP): Zero.
  • Global warming potential (GWP): <1 kg CO2 Eq./kg.

Bauder XPS (500) Inverted Flatboard.

Guidance for specification option:

Insert required thickness.


  • Type: High performance rigid extruded polystyrene insulation boards.
  • Facing: Smooth self-finished.
  • Density: 35 kg/m³
  • Standard board size: 1250 x 600 mm.
  • Board thickness: 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 100 mm, 120 mm, 140 mm.
  • Thermal conductivity: 40–60 mm: 0.034 W/m·K; >60 mm 0.036 W/m·K.
  • Compressive strength: 0.50 N/mm².
  • Ozone depletion potential (ODP): Zero.
  • Global warming potential (GWP): <1 kg CO2 Eq./kg.

Attachment

Loose laid (and suitably ballasted).

Guidance for specification option:

  • Setting out: Loose lay insulation directly over the capping sheet to brick pattern with staggered joints. Minimize cutting and avoid small pieces at perimeters and penetrations. Dependent upon the total thickness required, it may be necessary to construct the insulation using two layers of board. The manufacturer/supplier can advise on the available combination options.
  • Joints: Butt together.
  • Loading over inverted insulation (minimum): Ballast (landscaping) should be installed onto the Bauder WFRL Membrane (Water Flow Reducing Layer) to a minimum depth required to achieve a permanent minimum 80 kg/m² and load which prevents wind uplift and flotation of the insulation in high winds and/or heavy rainfall.
  • Additional loading at perimeters: On high buildings in more exposed areas, wind uplift may be a problem and in these instances paving slab ballast must be considered. Paving slabs should be a minimum of 50 mm thick. The slabs should be laid on paving slab supports of minimum 175 mm diameter (or equivalent base area).
  • All final details must to be confirmed with Bauder before proceeding.

Ballast

Required.

Guidance for specification option:

Type, thickness, weight of landscaping should be agreed with manufacturer per bespoke project basis.


Loading over inverted insulation (minimum): Ballast (landscaping) should be installed onto the Bauder WFRL Membrane (Water Flow Reducing Layer) to a minimum depth required to achieve a permanent minimum 80 kg/m² and load which prevents wind uplift and flotation of the insulation in high winds and/or heavy rainfall.

System accessories

Not required.

Bauder lighting conductors.

Guidance for specification option:

Lightning conductor clips are a specially designed secure clip that allows for movement.

  • Bauder Lightning conductor – Type 4: Polyvinyl chloride (PVC) coated or bare conductor.

Bauder insulated rainwater outlets.

Guidance for specification option:

For maintaining thermal continuity at drainage points. Suitable for warm, cold and inverted roof construction, the high thermal value of the rigid foam body prevents condensation from forming on the underside of the outlet.

Designed for use when connecting to conventional drainage systems, with excellent flow rate performance and is suitable for both new build and refurbishment projects. Outlets are included in the Bauder waterproofing system guarantee as they are integrated components.

Flow rate figures (where applicable) are based on BS EN 12056:3:2000, typically taken using a 35 mm header of water including leaf grille:

  • Bauder Bitumen Compact Vertical Outlet DN100: Insulated internal outlet, 6.1 L/s.
  • Bauder Bitumen Vertical Outlet DN70: Insulated internal outlet, 7.1 L/s.
  • Bauder Bitumen Vertical Outlet DN150: Insulated internal outlet, 7.2 L/s.
  • Bauder Insulated Parapet Outlet DN100 including pre-assembled pipe and dome grate: 0.6 L/s connected to external pipework; 0.7 L/s connected to external hopper.
  • Bauder Parapet Emergency Overflow Stainless Steel DN70: Emergency overflow/ tell-tale.

Bauder rooflights/ glazing/ ventilation.

Guidance for specification option:

All these glazing products are fully compatible with the roof waterproofing systems. Consult manufacturer for details and insert requirements.

  • BauderDOME Rooflight.
  • Bauder Euroglaze Rooflight.
  • Bauder Special Modular Rooflight.
  • Bauder Continuous Rooflight.
  • Bauder Walk-on Rooflight.
  • Bauder Direct Glazing.
  • Bauder AOV.
  • Bauder Modular Link Glazing.
  • Bauder Structural Rooflight.
  • Bauder Fire Rated Rooflight.

Hard landscaping/ Ballast options.

Guidance for specification option:

Consult manufacturer for information.

Water Flow Reducing Layer/ Vapour Permeable Membrane

Bauder JFRI WFRL.

Guidance for specification option:

Flexible and breathable sheet of polypropylene strands randomly spun-bound together, supplied as part of the JFRI Inverted Insulation system to minimize water flow through and below the insulation, therefore improving thermal performance. Supplied as part of the JFRI Inverted Insulation system to minimize water flow through and below the insulation.

  • Width: 3 m.
  • Length: 100 m.
  • Thickness: 0.45 mm.
  • Weight: 0.1 kg/m².
  • Colour: Black.

Bauder XPS WFRL.

Guidance for specification option:

Flexible and breathable geotextile membrane of polypropylene strands randomly spun-bound together, supplied as part of the Bauder XPS Inverted Insulation system to minimize water flow through and below the insulation, therefore improving thermal performance. Supplied as part of the XPS Inverted Insulation system to minimize water flow through and below the insulation.

  • Width: 3 m.
  • Length: 100 m.
  • Thickness: 0.17 mm.
  • Weight: 0.06 kg/m².
  • Colour: White.

Sustainability data

Third party certifications

Third party certifications

EPD

EPD

Environmental Product Declaration - RBM

BBA Agrément Certificate

BBA Agrément Certificate

Certificate: Bauderflex Systems 10/4744

CCPI System

CCPI System

Bauder Bauderflex-BauderflexGreen-CCPI

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