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Inverted roof systems

Inverted roof systems are insulated roof structures with the waterproofing membrane placed under the insulation. This ‘upside-down’ sequence means the structural roof deck is waterproofed first, then insulated and finally finished with ballast such as gravel or paving slabs. The ballast protects the loose-laid insulation from wind uplift.

An inverted roof system doesn’t require an additional air and vapour control layer (AVCL), as the waterproofing membrane beneath the insulation layer performs this function.

The positioning of the waterproofing membrane means it is protected from the elements, UV radiation and rapid changes in temperature. The waterproofing membrane is also less exposed to mechanical damage that could be caused by footfall or plant movement. Inverted roofs are therefore often specified for roof spaces that require plant or material storage and movement. They are also well-suited to constructions where regular foot traffic or vehicular traffic is required.

What are the benefits of inverted roof systems? 

  • The waterproofing membrane is protected from both elements and mechanical damage making inverted roof system durable and robust solutions
  • Systems can be used to create recreational areas such as green roofs, blue roofs, terraces, and parking decks.
  • The inverted roofing structure offers protection against extreme thermal changes during the winter and summer months, providing improved thermal stability to the system
  • A separate AVCL is not required

 

Considerations for installation of inverted roof systems

  • The insulation layer does not benefit from the protection of the waterproofing membrane and must be rot proof, durable and have low moisture absorption.
  • Provide roof falls using the guidance in BS 6229:2018 and calculate roof drainage provision in accordance with BS EN 12056-3:2000.
  • A high-quality waterproofing membrane is also important to protect the below construction

IKO roof systems and products are manufactured in the UK from responsibly, and where possible, locally sourced materials in order to reduce our carbon footprint and help with the sustainability of your project. The majority of our roofing systems are also BBA certified.

 

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IKO Armourplan Ballasted System

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    • Polymeric Single Ply PVC

    • Low maintenance lightweight system

    • 40 year BBA Certificate

    IKO Armourplan Inverted System

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      • Exceptional mechanical properties and product performance

      • Low maintenance lightweight system

      • High UV resistance and a long service life

      IKO Hybritech Inverted Roofing System

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        • Cold Applied Liquid

        • One-component: simple and rapid installation

        • Solvent-free and odourless

        IKO Metatech Cold Roofing System

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          • Two-component: extremely fast installation and drying

          • Sustainable PMMA technology

          • Installation possible under poor weather conditions

          IKO Metatech Inverted Roofing System

            Key Benefits to your project
            • Two-component: extremely fast installation and drying

            • Sustainable PMMA technology

            • Installation possible under poor weather conditions

            IKO Permaphalt

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              • Completely Seamless Waterproofing

              • Conforms to Carbon Zero Standards

              • BBA approved (Certificate No. 89/2299)

              IKO Permatec Anti-Root

                Key Benefits to your project
                • BBA Approved (Cert No.03/4009)

                • Environmentally friendly – made with recycled content

                • Less waste to control and dispose of – Zero waste packaging

                IKO Permatec Anti-Root System

                  Key Benefits to your project
                  • Hot Melt

                  • BBA Approved (Cert No.03/4009)

                  • Less waste to control and dispose of – Zero waste packaging

                  IKO Permatec Podium System

                    Key Benefits to your project
                    • BBA Approved (Cert No.03/4009)

                    • Environmentally friendly – made with recycled content

                    • Less waste to control and dispose of – Zero waste packaging

                    IKO Permatec System

                      Key Benefits to your project
                      • Hot Melt
                        Tough and resistant to impact damage thanks to its high tensile…

                      • Easily recyclable

                      • Excellent low temperature flexibility

                      IKO Polimar FCS (Fast Curing System) Waterproofing

                        Key Benefits to your project
                        • Cold Liquid
                          Completely Seamless Waterproofing with Vapour Resistivity. Fast Curing Liquid Roofing Waterproofing…

                        • Seamless and secure waterproofing of the most complex upstands with fleece reinforcement

                        • Highly flexible and crack-bridging even at extreme sub-zero temperatures

                        IKO Polimar Liquid Waterproofing System

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                          IKO Roofgarden Hybrid System

                            Key Benefits to your project
                            • Bituminous Felts
                              Achieves FLL 4-Year Root Penetration Test

                            • Purpose made roof garden waterproofing cap sheet

                            • Specifically formulated ‘Anti-Root’ coating

                            IKO Roofgarden System Torch-On

                              Key Benefits to your project
                              • Bituminous Felts
                                Achieves FLL 4-Year Root Penetration Test

                              • Purpose made roof garden waterproofing cap sheet

                              • Specifically formulated ‘Anti-Root’ coating

                              IKO Roofstar Plus System

                                Key Benefits to your project
                                • Mastic Asphalt
                                  Completely Seamless Waterproofing with Vapour Resistivity

                                • Complies with BS EN 12970:2000

                                • Enhanced Product Stability Across a Wide Temperature Range

                                IKO Roofstar System

                                  Key Benefits to your project
                                  • Mastic Asphalt
                                    Completely Seamless Waterproofing

                                  • Fire Performance achieving BS 476: Part 3: FAA

                                  • Completely seamless waterproofing with vapour resistivity

                                  IKO ULTRA Gold 20 Warm Roof Hybrid System

                                    Key Benefits to your project
                                    • Bituminous Felts
                                      BBA certified (91/2671), durability of at least 25 years

                                    • Robust membrane with excellent tensile strength, elongation and tear resistance

                                    • SBS elastomeric bitumen coating (low temperature flexibility -20°C)

                                    IKO Ultra Prevent 25 Warm Roof Hybrid System

                                      Key Benefits to your project
                                      • Bituminous Felts
                                        Classified BROOF(t4) in accordance with BS EN 13501-5: 2005 fire classification,…

                                      • BBA certification (91/2671) – durability with service life in excess of 30 years

                                      • IKO Prevent Graphite Fire Wall Technology with self-extinguishing properties

                                      IKO ULTRA Prevent Hybrid System

                                        Key Benefits to your project
                                        • Bituminous Felts
                                          Classified BROOF(t4) in accordance with BS EN 13501-5: 2005 fire classification,…

                                        • IKO Prevent Graphite Fire Wall Technology with self-extinguishing properties

                                        • Low temperature flexibility down to -30°C

                                        IKO ULTRA Stick System

                                          Key Benefits to your project
                                          • Bituminous Felts
                                            Prevent Graphite Fire Wall Technology with self-extinguishing properties

                                          • Classified BROOF(t4) in accordance with BS EN 13501-5: 2005 fire classification

                                          • Easy installation – self-adhesive/heat welding, no gas torches or hot bitumen required

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