Hot Melt Roof Systems

Bauder Hot Melt Waterproofing System is designed for use in inverted or buried roof scenarios. It is a hot applied polymer modified bitumen waterproofing applied in two layers with a polyester reinforcement. It is capable of a 100% bond to the approved surfaces it is applied to. Due to its composition, it remains in a live state, giving it a strength and flexibility to cope with the stresses and strains of the building it protects, for the length of time it remains. Safe2Torch guidance is followed for detail design where combustible materials are located.

Bauder Bakor Hot Melt 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   ■ Biosolar PV

When to specify...

Bauder Hot Melt Waterproofing is particularly advantageous for protected, inverted, or buried roofs such as green roofs, paved, terraces, podiums, plazas, and car parks. Bauder Hot Melt Waterproofing System can also be specified within Bauder Blue Roof and biosolar situations.  

The solution is primarily used for new build projects, but it can also be used in refurbishment situations that require an inverted roof solution. The system is a favourable option when used on insitu and precast concrete structures. Other suitable deck options are exterior grade plywood, OSB3, composite timber, cement bonded particle board and metal sheet.

Why Hot Melt?

■□ Cost effective as a waterproofing system where the specifier may expect no future replacement costs, once installed its anticipated durability (BBA verified 06/4350) will match the expected life of the building.
■□ A favourable choice for specifiers and main contractors alike that have challenging concrete structures to waterproof.
■□ Precise test standards and results are stated in Bauder technical data sheets and using our specification service will confirm suitability to each project.
■□ Range of insulations for inverted roof construction, including non-combustible options.
■□ Comprehensive range of guarantee packages to suit project and cover requirements.

Which system is right for my project?

This can be split into three sections:

Our BBA certified (06/4350) hot melt waterproofing remains the same* independent of the choice of insulation or surfacing on the project.
*Note: Whilst the core waterproofing remains the same on each project, some surfacing’s require different protection sheets.
Bauder offer applicable inverted insulation options in polystyrene variants and non-combustible options such as BauderGLAS Inverted Insulation.
Note: Choices may change depended on the project.
Bauder Hot Melt Waterproofing system is compatible with various landscaping scenarios including hard landscaping, green roofs, blue roofs or biosolar solutions.

Verified properties

CCPI Verification 0007700044/1225:

■□  This systems CCPI mark provides accuracy of data delivering assurance to specifiers. 

BBA Certificate 06/4350 stated:
■□ Fire testing to BROOF(t4) for external fire exposure on defined permutations of product build up.
■□ Suitable for zero falls (no back falls) on the structure.
■□ Its durability under normal service conditions will provide a durable waterproofing for the service life of the building in which it is incorporated.
■□ Seamless application provides monolithic waterproofing.
■□ Full adhesion to deck restricts lateral water movement.
Go to certifications 

EPD Certification:
■□ Bitumen membranes
■□ BauderROCK
■□ BauderGLAS
Go to certifications 


Inverted paved inc JFRIPREMIUM+ inverted insulation

  Function Product name Thickness
1 Water flow reducing layer BauderJFRI WFRL
​Other products may be specified according to project requirements.
0.45 0.1
2 Inverted insulation  BauderJFRI PREMIUM+
​Other products may be specified according to project requirements.
185 5.55
3 Access protection AP1 Access
Other products may be specified according to project requirements.
1.5 1.8
4 Structural waterproofing layers Bauder Bakor 790-11 hot melt
Bauder Polyester Reiforcement Sheet
6.2 6.5
System build-up 193.15 13.95

In-depth and up-to-date product specific technical data is available for each element within a system.
Download from our technical-centre

Other configurations:
Inverted Paved inc. JFRIPREMIUM+ Inverted Insulation
Inverted Ballasted inc. JFRIPREMIUM+ Inverted Insulation
Inverted Ballasted inc. BauderGLAS Inverted Insulation
Inverted Paved inc. BauderGLAS Inverted Insulation
Inverted Paved inc. JFRIPREMIUM+ Inverted Insulation
Inverted Extensive inc. BauderGLAS Inverted Insulation
Inverted Biodiverse inc. JFRIPREMIUM+ Inverted Insulation
Inverted Extensive inc. JFRIPREMIUM+ Inverted Insulation
Inverted Intensive inc. JFRIPREMIUM+ Inverted Insulation

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 0007700044/1225 for Bauder Bakor Hot Melt System.
■□ BBA Certificate 06/4350.
■□ The BBA certificate states; “when used in protected or inverted roof specifications, including an inorganic
      covering listed in the Annex of Commission Decision 2000/553/EC, can be considered to be unrestricted under the     
      national Requirements." 
■□ DD ENV 1187:2002 European Standard Fire Penetration.
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 ►


  • What is the main advantage of 790-11 over other waterproofing systems?
    Its main advantage, apart from being extremely cost effective as a waterproofing system, are that it forms a 100% bond to the deck eliminating the possibility of water tracking between it and the deck.
    It is monolithic once complete. No laps!
  • Is Bakor 790-11 a Reinforced System?
    True Hot Melt Systems utilize a Polyester Reinforcement Fleece between 2 no. 3mm layers of 790-11 Hot Melt compound. Research has shown that the best way of eradicating the effects of pin-holing is to employ a 2-layer reinforced system.
  • Why specify 790-11?
    Clarifying the advantages. 790-11 is a fully bonded system. A fully bonded system limits water migration even if damage occurs. 790-11 allows a building or structure to be made watertight in a hurry. It is not unusual for an experienced crew to install in excess of 1,000M2 per day?
  • What substrates can 790-11 be applied to?
    There are many types of substrates that 790-11 can be installed onto including:
    • In-Situ Concrete
    • Lightweight Concrete in Structural Metal Trays
    • Pre-Cast Concrete Planks
    • Brickwork
    • Concrete Blocks
    • Exterior Grade Ply
    • OSB3
    • Cement Bonded Particle Board
    • CLT Panels
    • Metal Plate
    • Bituminous Membranes
  • Should I look out for Surface Treatments on In-Situ Concrete Decks?
    Surface Applied Curing Compounds are sometimes used by the In-Situ Concrete Deck installer to aid and protect the curing process. Some of these compounds have a detrimental effect on the bond of 790-11 to the deck. Bauder should always be informed if these compounds have been employed for comment on their suitability.
  • What testing method should be used for ensuring In-Situ Concrete Decks have cured enough or have a moisture content conducive for 790-11 to be installed?
    The industry recognised test within the UK is the Peel Bond Test. At around 14-21 days after in-situ concrete has been poured we use the Peel Bond Test to ascertain whether the concrete has cured enough to provide a good bonding environment with our 790-11. The Peel Bond Test mirrors the specification. A layer of primer (Polymer or bituminous) is laid on a clean concrete area. Once dry a layer of 3-4mm of 790-11 is installed over the top with a patch of protection sheet laid into it when warm.
    The size of the test area should allow for 2 tests. One on day of installation and one 24 hours later.
    Cut 2 sides of a triangle through the protection sheet down to the deck. Pull the sample from the point. If the sample sticks to the protection sheet and not the deck this is an adhesive failure (FAIL), if the sample sticks to both the deck and underside of the protection sheet but pulls apart by the product parting this is called a cohesive failure (PASS).
    If you gain a pass wait 24 hrs to do a second test. If the pass is replicated you are good to go.

    Other methods that can be used are:

    • Moisture Meters – These can measure the moisture content remaining within the deck hydration process. 4 to 5% at 75% RH would be a pass target.
    • Plastic Sheet Method – This can be used as a quick guide to see whether a full-blown Peel Bond Test is worth carrying out. Basically, a plastic square is taped to a dry deck, sealing it. Wait 16-24 hours and peel back. Any moisture on the deck or underside of the plastic would indicate that too much moisture is still present within the in-site concrete for successful adhesion of the 790-11.
  • Can 790-11 be used on zero falls roofs?
    It can, as detailed in our current BBA Certificate. It must be remembered that zero falls is a completed roof deck with a fall of 0 to 1:80. There should be no back-falls.
  • What is the life expectancy of our 790-11 Hot Melt System?
    Our BBA Certificate gives our 790-11 Waterproofing System will provide an effective barrier to the transmission of liquid water and water vapour for the design life of the roof in which it is incorporated.
  • What things should be borne in mind when specifying EPS or XPS Inverted Insulation?
    The following items should be considered when specifying: 

    a) Wind Uplift – In areas of high risk, tall buildings etc we would recommend a wind uplift calculation is performed to confirm ballasting requirements.
    b) Flotation – all EPS or XPS inverted insulation needs to be ballasted to prevent floatation.
    c) UV degradation - EPS or XPS inverted insulation should be covered by its WFRL and subsequent surfacing as soon as possible after installation.
    d) Fire Risk - EPS or XPS inverted insulation should be covered by its surfacing as soon as possible to prevent any risk of fire at construction stage.
    e) U Values – Care must be taken with u value comparisons between different manufacturers inverted insulation. Design lambda values can vary making thickness comparisons tricky. Preference would be that each project has a calculation carried out to confirm thickness against specifier target u value. Always check to see whether insulation is incorporated to the deck underside as this could impact on the thickness requirement for the inverted insulation above deck. If requesting u value calculations, advise where in the country the project is located (post code required), as rainfall levels can change based on location.
  • Which outlets are recommended for use with 790-11?
    As a minimum, an outlet with a clamping ring should be used. Our Bauder Hot Melt Compact Vertical Outlets are ideal or any cast aluminum outlet with clamping ring can be used. We do not guarantee the seal to Non Bauder outlets.

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 hot melt roof system, then get in touch with our team to discuss your project’s individual needs.