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Bakor790-11 Hot Melt Rubberized Bitumen Roof Covering System Inverted

Third party certifications:
  • BBA Agrément Certificate

    Certificate type

Bauder Ltd

Hot melt, rubberized bitumen roof coating system, inverted.

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+44 (0)1473 257671 www.bauder.co.uk
Description

Hot melt, rubberized bitumen roof coating system, inverted.

Bakor790-11 hot melt rubberized bitumen roof coating system is suitable for a variety of applications on both new build and refurbishment projects, and can be used in cold and inverted roof scenarios.

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

See BBA certification 06/4350. Can meet current UK Building Regulations Part B for fire protection when it is specified within an inverted construction.

Key features:

  • Seamless application provides monolithic waterproofing.
  • Membrane remains 'live' throughout its life for self-healing.
  • Durability to match expected life of the building.
  • Excellent flexibility and adhesion characteristics.
  • Reduces chances of spread of flame when hard landscaping is included.

Benefits:

  • Infills minor cracks, eliminating the possibility of water ingress.
  • Minor penetrations and cuts will self-heal.
  • Expect no future replacement costs once installed.
  • System can be installed in temperatures as low as -18⁰C.
  • Achieves Broof (T4).

General information
Specification data - Liquid-applied inverted roof covering systems
Product Reference

Bakor790-11 Hot Melt Rubberized Bitumen Roof Covering System Inverted

Primer

Bauder Polymer Primer

Coating application

Bakor790-11 Hot Melt rubberised bitumen

Two 3 mm coats.

Reinforcement

Bauder Neoprene flashing to junctions of different substrate materials

Bridges cracks above 3 mm in concrete decks and reinforces and waterproof movement joints.

Bauder Polyester reinforcing to all areas

Embedded between the two coats.

Minimum dry film thickness

6 mm (2 x 3 mm)

Coating protection layer

AP1

1.5 mm thick, modified bitumen, sand finished membrane to be used as the coating protection layer and on concealed upstand detailing.

AP2

4.2 mm thick, elastomeric bitumen root resistant, torch applied capping sheet/ coating protection layer.

AP3

3 mm/ 6mm thick, polymer bitumen protection board, laid loose (over AP1 layer) as additional temporary surface protection prior to landscaping.

K4E

4.2 mm thick, elastomeric bitumen, torch applied capping sheet/ coating protection layer.

K5E

5 mm thick, torch-applied, heavy duty, elastomeric bitumen, mica finished capping sheet/ coating protection layer.

X4S

4.2 mm thick, torch-applied, heavy duty, elastomeric bitumen, mica finished capping sheet/ coating protection layer.

Insulation -
Type

Bauder JFRI (200) HP Inverted Flatboard

Bauder JFRI (200) Tapered board

Bauder JFRI (300) Inverted Flatboard

Bauder JFRI (300) Tapered board

Bauder XPS GG (300) Inverted Flatboard

Bauder XPS GG (500) Inverted Flatboard

Bauder XPS GG (700) Inverted Flatboard

Thickness

See ‘Options’ below and insert requirement for your chosen insulation type.

Water Flow Reducing Layer/ Vapour Permeable Membrane

Bauder JFRI WFRL

Flexible and breathable sheet of polypropylene strands randomly spun-bound together, supplied as part of the JFRI Inverted Insulation system.

Bauder XPS WFRL

Flexible and breathable geotextile membrane of polypropylene strands randomly spun-bound together, supplied as part of the Bauder XPS GG Inverted Insulation system.

Accessories

See 'Options’ below and insert requirements.

Standard product features

Primer:

Contact Bauder to confirm substrate suitability if required.

- Bauder Polymer Primer:

A synthetic rubber-based primer, designed specifically to enhance the adhesion of Bauder Hot Melt Waterproofing to difficult surfaces and speed up the total time of installation due to its quick drying time.

  • Before application: All surfaces must be dry, clean and free from dust, dirt, oil, grease and loose material including laitance. Smooth metal to be prepared using a wire brush. Any concrete curing surface treatment should be removed – see Bauder guidance on concrete curing.
  • Application method: Bauder Polymer Primer to be spray, brushed, or roller applied uniformly to all surfaces receiving the new waterproofing, avoiding excessive application. Ponding of the primer is not recommended. The primer shall be thoroughly dry before applying the hot melt rubberised bitumen coating. Allow to dry for a minimum of 30 minutes.
  • Coverage: 4–6 m² per litre, dependent upon substrate porosity.
  • Application temperature: 5–25°C.
  • Drying time: 15–30 minutes.
  • Coats: Fully bond. Allow volatiles to dry off thoroughly between coats.
  • Recoat time if left exposed: Necessary after 24 hours exposure if waterproofing has not yet been applied, to maintain adhesion performance.
  • Caution: Use only outdoors in well ventilated areas or with respiratory apparatus and keep away from all sources of ignition. Take necessary precautions to avoid the solvent vapour from entering the buildings ventilation system.

Coating application:

- Bakor790-11 Hot Melt Rubberised Bitumen:

  • Bakor 790-11 is poured hot onto the deck and spread by a rubber bladed squeegee in two layers at an average thickness of 3 mm nominal for each layer, sandwiching spun bond Bauder Polyester Reinforcement Sheet, to form a monolithic membrane with nominal 6 mm thickness. Application in two layers increases the membranes crack bridging performance, and it can cope with a wider variety of substrate conditions.
  • The hot semi liquid form of the Bakor 790-11 enables it to infill and cover every crack and deviation in the deck to form a very strong 100% bond with the deck. This eliminates the possibility of water being able to track beneath the membrane in the event of mechanical damage. It bonds to sound concrete, brickwork or steel and readily conforms to any surface irregularities, protrusions, corners etc. Bakor 790-11 contains no solvents. There is therefore no curing period; the system is ready immediately to accept whatever surfacing has been specified.
  • It has excellent low-temperature flexibility and bonding characteristics and can be applied in temperatures down to -18°C on to a clean, dry, frost-free surface.

Product Options

Reinforcement:

- Bauder Neoprene Reinforcing Sheet:

  • Bauder Neoprene Reinforcing Sheet is used as a reinforcement within the Bauder Bakor 790-11 monolithic membrane system. Bauder Neoprene Reinforcing Sheet bedded between the two layers of hot applied Bakor 790-11 membrane is used to provide extra reinforcement at differing materials i.e. metal outlet flanges and concrete, expansion joints, etc. The neoprene's flexibility and elongation characteristics greatly strengthen the system at these vulnerable points.
  • It is installed 75 mm on horizontal and 75 mm vertically between the first and second 3 mm layers (minimum) of Bakor 790-11.

It is also used to bridge cracks above 3 mm in concrete decks and to reinforce and waterproof movement joints.

  • Material: Uncured neoprene.
  • Width: 150 mm, 450 mm, 600 mm, 900 mm.
  • Length: 30.48 m.
  • Weight: 11.36 kg/m², 27.73 kg/m², 29.55 kg/m², 60 kg/m².

- Bauder Polyester Reinforcement Sheet:

  • Bauder Polyester Reinforcement Sheet is an unsaturated, spun bonded polyester mat for use within Bakor Hot Melt waterproofing systems.
  • Bauder Polyester Reinforcement Sheet is lightly brushed into the first 3 mm layer (minimum) of Bakor 790-11 Hot Melt Waterproofing to ensure complete embedment prior to the second 3mm layer (minimum) of Bakor 790-11 Hot Melt Waterproofing.
  • Overlaps should be at least 75 mm.

Bauder Polyester Reinforcement Sheet should be encapsulated with 790-11 at the end of the working day.

  • Width: 1.016 m.
  • Length: 182.88 m.
  • Thickness: 0.2 mm.
  • Weight: 9.5 kg/roll.

Coating Protection layer:

- AP1:

Glass reinforced, modified bitumen, sanded surface bituminous membrane, 1.5 mm thick. Used as an access sheet when bedded into the second layer of the Bakor 790-11 hot melt monolithic system.

No UV protection, only suitable for applications where it is totally covered; not for exposed roofs. Not for use with green roof systems.

  • Width: 1 m.
  • Length: 20 m.
  • Thickness: 1.5 mm.
  • Weight: 1.8 kg/m².
  • Surface: Top and bottom: Fine sand.
  • Reinforcement: 60 g/m² glass.
  • Tensile strength: Length 450 N/50 mm; transverse 320 N/50 mm.
  • Elongation at break: 2.5%.

- AP2:

Heavy duty, torch-applied, SBS elastomeric root resistant bitumen capping sheet, 4.2 mm thick. The product features chemically treated bitumen to deliver superior root resistance which has been tested and approved by the FLL. The membrane is reinforced with 250 g/m² spunbond polyester fleece to allow the finished product to cope with structural movement without fracture. For use with green roof systems.

  • Width: 1 m.
  • Length: 7.5 m.
  • Thickness: 4.2 mm.
  • Weight: 5 kg/m².
  • Surface: Top: Green slate mineral chippings; Bottom: Thermofusible polyethylene.
  • Reinforcement: 250 g/m² recycled spunbond polyester.
  • Cold bending test: -36°C.
  • Softening point: >120°C.
  • Tensile strength: Length >1000 N/50 mm; transverse >1000 N/50 mm.
  • Elongation at break: Length >45%; transverse >45%.

- AP3:

AP3 Protection Board is a pre-fabricated board made from a mixture of fibres saturated with at least 75% bitumen. It is completely waterproof and provides superior impact and abrasion resistance. It is ideal for horizontal and vertical applications. Both sides of the product are smooth surfaced covered both sides by a polyethylene film.

The boards should be installed as per specification. Generally loose laid with staggered, sealed 100 mm laps. Laps may need be taped in certain situations using heavy duty bitumen tape.

  • Width: 1 m.
  • Length: 2 m.
  • Thickness: 3.1/ 6.1 mm.
  • Weight: 4.09/ 8.34 kg/board.

- K4E:

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 when used on exposed flashings and the product is available in a choice of colours. Not for use with green roof systems.

  • Width: 1 m.
  • Length: 7.5 m.
  • Thickness: 4.2 mm.
  • Weight: 5.5 kg/m² (Charcoal Grey); 5 kg/m² (Natural 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/50 mm; transverse >800 N/50 mm.
  • Elongation at break: length >40%; transverse >40%.

- K5E:

Torch-applied, heavy duty, elastomeric bitumen, mica finished capping sheet, 5 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. Not for use with green roof systems.

  • Width: 1 m.
  • Length: 5 m.
  • Thickness: 5 mm.
  • Weight: 5.8 kg/m².
  • Surface: Top: Mica; Bottom: Thermofusible polyethylene.
  • Reinforcement: 250 g/m² recycled spunbond polyester.
  • Cold bending test: -30°C.
  • Softening point: >110°C.
  • Tensile strength: Length >800 N/50 mm; transverse >800 N/50 mm.
  • Elongation at break: Length >40%; transverse >40%.

- X4S:

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 hard landscaping such as pavers or promenade tiles. Not for use with green roof systems.

  • 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/50 mm.
  • Elongation at break: Length >35%; transverse >35%.

Insulation:

- Type:

JFRI (200) HP Inverted Insulation Flatboard:

A range of flat high performance rigid expanded polystyrene insulation boards designed specifically for inverted roof applications.

  • Type: High performance rigid expanded polystyrene insulation boards.
  • Facing: Unfaced.
  • Colour: Grey.
  • Density: >30 kg/m³.
  • Standard board size: 1215 x 1215 mm (including 15 mm rebate).
  • Board thickness: 50 mm, 60 mm, 100 mm, 120 mm, 130 mm, 135 mm, 140 mm, 150 mm, 160 mm, 165 mm, 175 mm, 180 mm, 185 mm, 195 mm, 200 mm, 205 mm, 210 mm, 220 mm, 225 mm, 230 mm, 235 mm, 240 mm.
  • Thermal conductivity: Declared 0.031 W/m·K; design 0.035 W/m·K (may vary dependent on thickness specified).
  • 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%.

JFRI (200) Inverted Insulation Tapered:

A range of tapered high performance rigid expanded polystyrene insulation boards designed specifically for inverted roof applications.

  • Type: High performance rigid expanded polystyrene insulation boards.
  • Facing: Unfaced.
  • Colour: White.
  • Density: >30 kg/m³.
  • Standard board size: 1200 x 600 mm.
  • Board thickness: Contact Bauder for options.
  • Thermal conductivity: Declared 0.033 W/m·K; design 0.038 W/m·K.
  • Compressive strength: >0.20 N/mm² with 10% nominal compression.
  • Global warming potential (GWP): <5 kg CO2 Eq./Kg.
  • Recyclability: 100%.

JFRI (300) Inverted Insulation Flatboard:

A range of flat high performance rigid expanded polystyrene insulation boards designed specifically for inverted roof applications.

  • Type: High performance rigid expanded polystyrene insulation boards.
  • Facing: Unfaced.
  • Colour: White.
  • Density: >40 kg/m³.
  • Standard board size: 1215 x 1215 mm (including 15 mm rebate).
  • Board thickness: 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 120 mm, 130 mm, 135 mm, 140 mm, 150 mm, 160 mm, 180 mm, 185 mm, 195 mm, 200 mm, 205 mm, 210 mm, 220 mm, 225 mm, 230 mm, 235 mm, 240 mm.
  • Thermal conductivity: Declared 0.033 W/m·K; design 0.038 W/m·K (may vary dependent on thickness specified).
  • 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%.

JFRI (300) Inverted Insulation Tapered:

A range of tapered high performance rigid expanded polystyrene insulation boards designed specifically for inverted roof applications.

  • Type: High performance rigid expanded polystyrene insulation boards.
  • Facing: Unfaced.
  • Colour: White.
  • Density: >40 kg/m³.
  • Standard board size: 1200 x 600 mm.
  • Board thickness: Contact Bauder for options.
  • Thermal conductivity: Declared 0.033 W/m·K; design 0.038 W/m·K.
  • 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%.

Bauder XPS GG (300) Inverted Insulation Flatboard:

A range of flat high performance rigid extruded polystyrene insulation boards.

  • 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 GG (500) Inverted Insulation Flatboard:

A range of flat high performance rigid extruded polystyrene insulation boards.

  • Type: High performance rigid extruded polystyrene insulation boards.
  • Facing: Smooth self-finished.
  • Density: 35 kg/m³
  • Standard board size: 1250 x 600 mm.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.

Bauder XPS GG (700) Inverted Insulation Flatboard:

A range of flat high performance rigid extruded polystyrene insulation boards.

  • Type: High performance rigid extruded polystyrene insulation boards.
  • Facing: Smooth self-finished.
  • Density: 45 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: 0.70 N/mm².
  • Ozone depletion potential (ODP): Zero.
  • Global warming potential (GWP): <1 kg CO2 Eq./Kg.

Water flow reducing layer (Vapour permeable membrane):

Designed to minimize water flow through and below the insulation, therefore improving thermal performance.

- Bauder JFRI WFRL:

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:

Supplied as part of the XPS GG 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.

Accessories:

- Bauder Aluminium Termination Bar:

Natural finish aluminium (25 x 6 mm flat plate) used at upstand details to give protection to the top edge of the waterproofing. Usually covered by a metal/lead counterflashing. It should be restricted to use on upstands where a chase cannot be cut into the wall.

- Bauder GRP Termination Bar:

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.

- Bauder Hot Melt Compact – Vertical Outlet (DN100):

A thermally insulated rainwater outlet with vertical spigot designed for use when connecting to conventional gravity drainage systems, giving thermal continuity and excellent flow rate performance.

The high thermal value of the rigid foam body prevents condensation from forming on the underside of the outlet body.

The integrated screw down clamping ring and neoprene gaskets ensure total waterproofing security between the waterproofing system and the outlet.

Manufactured as a one-piece rigid polyurethane (PUR) foam body that forms the integral sump and spigot. It is manufactured with pre cast studs to receive the fasteners of the clamping ring. This ensures full mechanical sealing between the outlet unit and the Hot Melt Waterproofing and Protection Sheet. A tough, but lightweight, polyamide domical leaf grille permits free flow of water, whilst preventing leaf litter or other debris from entering the outlet. This push fit grille is easily removed to allow for maintenance.

A core hole of 250 mm diameter must be cut in the roof deck to accommodate the outlet. In all cases, during installation, the outlet body must be mechanically fixed to the deck.

Hot Melt Compact – Insulated Vertical Outlets are suitable for connection to:

  • 110 mm uPVC “O” ring socketed soil grade pipe to BS 4514: 1983.
  • Socketed and socket-less cast iron pipework to BS 416: 1973 and EN 887.
  • Socketed pipework will require cold caulking or PVC to cast iron adaptors. Socketless pipework can be connected using an appropriate SML mechanical coupling.
  • HDPE pipework with appropriate SML mechanical coupling BS EN 12056-3: 2000 Flow rates (L/s).

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, which for the Hot Melt Compact – Insulated Vertical Outlet gives a flow rate performance of 6.1 L/s.

- Bauder Parapet Emergency Overflow Stainless Steel DN70:

Provides a visible overflow for water build up at roof level. Can be used as part of a Bauder Blue Roof solution.

The overflow opening should be positioned approx. 35 mm above the lowest point of the waterproofing or impermeable landscape finish. For Blue Roofs, the bottom of the overflow opening should be positioned level with the top of the H-Max. It is used in conjunction with other roof drainage outlets to ensure that there is no water ingress into the building and that the structural load of the roof is not exceeded and provides a visible warning that the roof is holding excessive water.

They are not suitable or intended for connection to internal pipework that is within a wall construction or boxed in and is inaccessible after construction.

- Bauder rooflights/ glazing/ ventilation:

All these glazing products are fully compatible with the roof waterproofing systems. Consult Bauder 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.

- Landscaping/ Ballast options:

Consult Bauder for further details.

Third party certifications
  • Certificate: 06/4350
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