Bituminous Systems - Bauderflex

When to specify...

Bauderflex is suited to new build and refurbishment applications, and is robust enough to withstand foot traffic and most permanently sited plant. It can be used in warm and cold roof designs and also to overlay existing roofing materials.  Our Bauderflex Roof System meets current UK Building Regulations Part B for external fire protection and features torch-free and safe to torch installation on combustible details.

NBS and BIM specificationsSystem summariesSystem summaries


1 Bauder K4E cap sheet or AP2 for green roofs Our Bauder K4E is a torch applied elastomeric bitumen cap sheet.
BauderTEC SPRINT DUO Self-adhesive elastomeric bitumen underlayer.
PIR FA-TE insulation or PIR tapered (laid to falls) Bauder PIR FA-TE insulation is a rigid urethane foam insulation faced on both sides with aluminium foil. 

Bauder PIR tapered insulation provides falls to a roof instead of incorporating into structure.
4 BauderTEC KSD Mica Tear resistant, aluminium lined self-adhesive bitumen air & vapour control layer

Key features

•  Capping sheets with tensile strength up to 800N/50mm
•  Withstands climatic extremes of over 100C variation
•  Patented self-adhesive DUO products
•  Expandable graphite fire retardant prevents spread of flame


•  Heavy duty, robust and extremely tough
•  BBA certified life expectancy in excess of 25 years
•  Resistant to European climatic conditions
•  Membrane resists impact and tearing
•  Satisfies requirements of Part B of Building Regulations

Approvals, certification and guarantee

•  Comprehensive range of guarantees with high level value of cover
•   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”, which confirms they are appropriate for use on any part of a roof.  Fire rating explained ►

Environmental credentials

•  Reinforcement used in capping sheet is made from recycled polyester
•  Bauder insulation is CFC and HCFC free with zero ODP
•  BRE Green Guide Generic A Rating (A+ to E scale) for PIR insulation

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 ►

Safe2Torch industry initiativeBauder Torch-Free Detailing Methods 

Our 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 ►

Downloads and other information

Cap sheet colours

The Bauder K4E Cap Sheet is available in these colours.

natural slate  charcoal grey
brown AP2 root barrier

Technical Excerpt

Life expectancy: > 30 years
Tensile strength: 800N/mm²
Fire rating: BROOF(t4) - unrestricted and can be used anywhere on the roof (England), Low Vulnerability (<6m) (Scotland)
Standards: BS EN 13707 Reinforced Bitumen Membrane Sheets for Roof Waterproofing

Technical Downloads

BIM and NBS Specifications ►
BBA Bauderflex►
BBA Bauderflex Green Roof ►
System maintenance advice ►
Bauder GmbH ISO 50001:2011 ►