IKO SBS Membrane Installation Guidelines

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IKO SBS Membrane Installation Guidelines

Notice to the Reader:

The instructions provided below are reprinted from the manufacturer's own materials which were submitted to the RoofStar Guarantee Program for inclusion in this Manual. The reader is urged to check these against current publications issued by the manufacturer, to ensure accuracy.


Contact Address: See Membership List in Section 1.


Country of Origin: Canada

Country of Manufacture: Canada, USA, Belgium, France

Year First Installed
B.C.: 1985
Canada: 1985

1 Description

The main components of the roofing and waterproofing systems are the TORCHFLEX and MODIFLEX membranes: tough, flexible, SBS polymer modified bitumen prefabricated sheets, appropriately reinforced and surface-finished for specific applications.

The highest quality raw materials are utilized in a manufacturing process which saturates and coats non-woven glass or polyester fabric with SBS polymer modified bitumen.

The membranes are installed on the job site by hot asphalt or propane torch welding, bonding the adjacent sheets and flashing plies to form an integral roofing / waterproofing system.


The roofing assembly / material information published in the RoofStar Roofing Practices Manual does NOT represent a complete set of the manufacturer's published data, nor does it represent a detailed specification. The preparation of a detailed specification is the responsibility of the design authority.


  1. For use over roof decks in commercial, institutional, and industrial applications, wherever built-up roofing is presently used.
  2. As a loose-laid roofing membrane under ballast (gravel or pavers) and in protected membrane roof systems.
  3. As a fully-adhered or mechanically-fastened roofing membrane, without ballast; on flat, curved, or domed roofs, or unusual configurations.
  4. As a roofing membrane over existing roofs in recover or replacement applications.


  1. Deliver and store materials in original containers with manufacturer's labels and seals intact.
  2. Store rolls on end with selvage edge up, elevated from contact with ground and moisture, in weatherproof shelters; avoid prolonged exposure of light sensitive materials to sunlight.
  3. Below +5°C (+41°F), store rolls in heated enclosures prior to use; bring only enough for immediate use to the work area.
  4. Store combustible fluids and fuels away from heat and open flame.


  1. Slope range: from dead-level (except single-ply) up to and including vertical; the choice of membrane combination and its suitability to a particular slope is governed by the type of deck, insulation and fastening capability, application method, perceived stresses on the membrane, and its required finish; please consult IKO for assistance in identifying these factors and for recommended choice of materials.
  2. Slope limitations:
    • Minimum recommended slope 1:50 (1/4" in 12")
    • Mechanically fasten over 1:12 (1" in 12")
  3. Minimum ambient application temperature:
    • hot asphalt-applied -10°C (+14°F)
    • torch-applied -40°C (- 40°F)
    • adhesive-applied + 5°C (+41°F)
  4. Chemical limitations: incompatible with coal tar pitch; not resistant to oil or most petroleum products; consult IKO for specific requirements.


NOTE: For specific membranes or assemblies consult manufacturer.)
  1. Canadian General Standards Board: conforms to CGSB 37-GP-56M


  1. Applicator training: formal courses and field training leading to certification as an IKO installer are available.
  2. Field technicians: are available to advise and assist contractors in installation techniques, production, and quality control.
  3. Specification: a complete specification service and design assistance program is offered.


  • Torches: use only torches designed for torch-on roofing material.


NOTE: Regardless of the materials listed below or anywhere else in these manufacturer's guidelines, only materials accepted for use in the RoofStar Guarantee Program, or accessories associated with those materials, may be used to qualify for a RoofStar Guarantee. To see a list of the manufacturer's products accepted for use in the RoofStar Guarantee Program, click on the link above.


Consult the list of Accepted Materials by clicking on the MATERIALS link above.



  1. Apply roofing materials over clean, dry surfaces in accordance with RGC good roofing practices.
  2. Use only compatible primers and adhesives, mastics, or sealants.
  3. Provide adequate protection against fire, particularly when using propane torch-applied membranes.
  4. Torch base sheets to suitable substrates only; many rigid insulations require suitable overlay. Wood fibreboard and fibrecants are not acceptable.


  1. Surfaces to receive membranes must be clean, dry, and primed with compatible primer as required.


  1. Mechanically fasten insulation over nailable decks, in accordance with RoofStar Guarantee Standards.
  2. Embed insulation in a 1.5 kg / m² (30 lb / square) mopping of hot asphalt over non-nailable deck.
  3. Install 11 mm (7/16") asphalt-impregnated fiberboard as an insulation overlay where required by RoofStar Guarantee Standards.
  4. Install wood nailing strips on slopes exceeding 1:12 (1" in 12").
  5. Protectoboard is an accepted insulation overlay. In applications requiring two layers of overlay (i.e. over heat sensitive insulations), protected board is accepted as the second layer.
  6. Fasten Protectoboard overlay using nine fasteners per board, as shown, or alternately adhere Protectoboard with hot asphalt, according to RoofStar Guarantee Standards.


  1. Asphalt-adhered: apply asphalt to substrate at a rate of 1.2 to 1.5 kg / m² (25 to 30 lb / square), at minimum 205°C (400°F) and maximum 260°C (500°F) at point of application; mop no further than 1 m (3') ahead of unrolling material; lap sides 75 mm (3") and ends 150 mm (6") unless specified otherwise.
  2. Torch-adhered: torch on to suitable substrates or base sheets; lap sides 75 mm (3") and ends 150 mm (6").
  3. Adhesive-applied: install IKO's adhesives and membranes according to IKO's printed instructions.
  4. Use of cant strips is recommended. Where used, install base to the cant. Where not used, install base ply to the base of vertical surfaces.
  5. Start at low point and, where slopes are 1:15 (3/4" in 12") or less, start at right angles to the slope; on slopes greater than 1:15 (3/4" in 12") install parallel to the slope.
  6. Stagger end laps minimum 300 mm (12").
  7. Install base sheet stripping, starting at the outer edge of parapet, across top face, down inside vertical surface, over base sheet on cant strip (if present), and out a minimum of 150 mm (6") onto “flat” portion of roof, fully bonded throughout (unless specified otherwise); apply base sheet stripping over primed flanges of installed metal accessories.
  8. Install membrane cap sheet parallel to base sheet, with laps of cap sheet being offset a minimum of 300 mm (12") from those of base sheet, using same side and end laps as base sheet; embed granules (do not remove) prior to bonding onto granular surfaces.
  9. Limit asphalt / bitumen “bleed-out” at laps on granular surfaces to a maximum of 10 mm (3/8") width.
  10. Extend cap sheet stripping a minimum of 150 mm (6") onto “flat” portion of roof.
  11. Check laps with round-nosed roofing trowel as work proceeds; reseal unbonded areas and voids; repair punctures or tears with patches of similar materials torch-welded to surface.
  12. Consult IKO Industries Ltd. Technical Department for recommendations on fastener type, rates and pattern for mechanically attached membranes.

2 Membrane Assemblies

2.1 Exposed Membrane - Un-insulated

Slope Limitation: NO LIMIT
In-Service Performance: Min.: -18°C (+0°F) }
Temperature of the Min.: -18°C (0°F) Required membrane tensile strength varies.
Membrane: Min.: <-18°C (0°F)
Max.: +93°C (+200°F)

2.2 Exposed Membrane - Insulated

Slope Limitation: NO LIMIT
In-Service Performance: Min.: -18°C (+0°F) }
Temperature of the Min.: -18°C (0°F) Required membrane tensile strength varies.
Membrane: Min.: <-18°C (0°F)
Max.: +93°C (+200°F)

2.3 Protected and Modified Protected Membrane Roof Assemblies

Slope Limitation: NO LIMIT
In-Service Performance: Min.: -18°C (+ 0°F) }
Temperature of the Min.: -18°C ( 0°F) Required membrane
Membrane: Min.: <-18°C ( 0°F) tensile strength varies.
Max.: +93°C (+200°F)