Bauderflex System

Our Bauderflex system offers an alternative to the specifier on a tighter budget as it uses thinner elastomeric bitumen membranes compared to BTRS and BTRS PLUS.

Bauderflex system achieves a CCPI mark which recognises that any claims made about it have been independently assessed across 11 clauses, providing greater clarity by offering improved product information. This gives specifiers confidence in the knowledge that they will have unambiguous information when deciding which of our systems is best for their new build or refurbishment project. 

Enhance with:
■ Green roofs   ■ Blue roofs   ■ Solar PV   ■ Biosolar PV

When to specify...

Bauderflex is a fully bonded system suitable for new build and refurbishment projects for warm or inverted roof construction with a choice of insulations; also used as a two-layer system to overlay an existing roof that is thermally reliable and still meets current standards. The system uses the BauderFLEX K4E 4.2mm cap sheet and comes in three mineral colour finishes. There is a selection of underlayers and AVCLs to suit specific project requirements and where a green roof is required the BauderPLANT E 42 is incorporated to form the Bauderflex Green Roof System.

Plus points

■□ 4.2mm modified elastomeric bitumen cap sheet
■□ Polyester fleece reinforcement.
■□ Safe2Torch design.
■□ Comprehensive range of guarantee packages to fulfil cover requiremets for project (dependant of system/product selection)
■□ Standards: BS EN 13707 Reinforced Bitumen Membrane Sheets for Roof Waterproofing.

Verified properties

CCPI Verification 0007700012/1025​:
■□  This systems CCPI mark provides accuracy of data delivering assurance to specifiers. 

BBA Certificate 10/4744:
■□ Fire classificaton BROOF(t4) to BS EN 13501-5 tested to TS 1187 test 4 for external fire exposure on defined permutations of product build up.
■□ Fire properties - membranes deemed "unrestricted" in certain circumstances as categorised in BBA Certificate.
■□ Service life > 30 years.
EPD Certification on system components:
■□ Bitumen membranes
■□ PU Insulation - Aluminium Facing
■□ BauderROCK insulation
■□ BauderGLAS Insulation
Go to certifications >>


  Function Product name Thickness
1 Cap sheet BauderFLEX K4E charcaol grey (shown)
BauderPLANT E 42 (specified for green roofs)
4.2 5.5
2 Underlayer BauderTEC Sprint DUO 
Other underlayers may be specified according to project requirements.
2 2.5
3 Insulation (0.15) BauderPIR FA-TE (shown) 140  4.2
  Warm roof insulation options BauderPIR FA tapered
BauderROCK flatboard
BauderROCK tapered
variable variable
  Inverted roof insulation options BauderJFRI
variable variable
Bauder PU Tin Adhesive nominal 0.16
4 Air and vapour
control layer
Other AVCLs may be specified according to project requirements.
2.5 2.5
  Primer Varies depending upon
substrate type - please refer
to specification
nominal nominal
System build-up 148.7 14.86
In-depth and up-to-date product specific technical data is available for each element within a system.
Download from our technical-centre

Cap sheet colours

The Bauder K4E Cap Sheet is available in these colours.

  Grey slate       Charcoal grey       Brown           Plant-E (for green roofs)

Approvals, certification and guarantee

■□ Comprehensive range of guarantee packages to fulfil cover requirements for the project (dependant on system/product
      selection). For more information contact our technical department for a sample guarantee outlining cover level, terms
      and conditions.
■□ CCPI Verification Number 0007700012/1025 for Bauderflex and Bauderflex Green Roof System.
■□ BBA certification for Bauderflex waterproofing and Bauderflex Green Roof Systems.
■□ BS EN 13707 - Reinforced Bitumen Membrane Sheets Compliant.
■□ Meets current Building Regulations for fire performance and our BBA certificate states, “the systems, when
      used in a suitable specification, will enable a roof to be unrestricted under the Building Regulations”,
      confirms they are appropriate for use on any part of a roof. 
View certifications here ►

Installation and maintenance

The quality and experience of the installing operative is paramount to ensuring a successful project. Bauder Approved Contractors are the only people fully trained and certified to install our products. They provide the necessary experience that our exceptional guarantee demands.
Go to approved contractor information ►
Go to maintenance advice ►

Bauder torch-free detailing methods 

Safe2Torch industry initiativeOur torch-free detail design specifically delivers secure safe application techniques 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 even debris such as dry leaf material that is at risk from ignition. The application methods meet NFRC Guidance Document 'Safe2Torch'.

Go to Torch-Free Detailing ►

Contact us today about your project

Each project is unique in its requirements, but we have case studies and examples of our work available for you to look at. If you are looking for a bituminous membrane roof system, then get in touch with our team to discuss your project’s individual needs.