Siplast SBS Waterproofing Installation Guidelines

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Siplast SBS Waterproofing 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.

Manufacturer: SIPLAST / ICOPAL

Contact Address: See Membership List in Section 1.


Country of Origin: France of Manufacture: France, USA, Germany, England, Poland, Denmark

Year First Installed
B.C.: 1978
Canada: 1978
Foreign: 1967

1 Description

Siplast developed prefabricated sheet membranes in 1955 and introduced SBS Modified Bitumens in 1967, producing an elastomeric blend with exceptional elongation recovery characteristics. Reinforcing mats (consisting of polyester, fibreglass, or a combination thereof) are saturated and coated with varied thicknesses of elastomeric bitumen to produce roof membranes with specific physical properties. Presently, Siplast manufacturers a wide variety of membranes, each designed to satisfy the demands of particular roof conditions. The "Teranap" series is Siplast's major waterproofing membrane system. These waterproofing membranes are available with polypropylene film or sanded finishes and are designed to be installed with heat welding in plaza deck waterproofing applications.


The waterproofing assembly / material information published by 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 Two-ply roof membranes: the first ply consists of a base sheet, fully heat welded. The second ply consists of a cap sheet fully heat welded.


.1 Binders:
When bitumen is modified by the addition of polymers, microscopic polymeric networks are created within the bitumen which markedly changes the characteristics of the materials. Only if the polymer has been thoroughly mixed with the bitumen and the elastomeric segments remain well dispersed at ambient temperatures, will the structure be continuous and rubbery and form entirely within the bitumen. In other words, these advantageous properties may be obtained only with a suitable degree of compatibility between bitumen and thermoplastic resin and by preparing the mixture with a certain type of bitumen.
.2 The binder in the roofing sheet is the critical component. It provides:
  • the waterproofing system
  • the elasticity
  • the aging characteristics
  • the flexibility at low temperatures
.3 Reinforcement:
The characteristics of a quality binder can be enhanced by the proper choice of reinforcements. Reinforcement must counteract rupture in traction or compression, the limit of elasticity in traction or compression (undefined repeatable movements), or the limit of fatigue. To a lesser extent, reinforcements offer resistance to static puncture, stress induced by temperature variation, and wind effects. With few exceptions, however, it reduces the cold bending properties, the elasticity, and the elongation to rupture.
While many types of reinforcements can be used, the most common are glass fibre, polyester and composite glass / polyester. Glass fibre reinforcement offers high tensile strength and excellent dimensional stability while polyester offers greater puncture resistance. The same type and weight of mat will give superior puncture resistance and tensile strength if saturated with elastomeric bitumen rather than oxidized bitumen.
.4 Aging:
Proper aging is contingent on the rate of modification, the compatibility of the bitumen with the polymer, and the blending being done correctly, with correctly blending the bitumen and SBS being the most important. Thick sheets display a much slower rate of aging than the thin sheets. Reinforcement does little to extend the aging process.
.5 Thickness:
For heat welded application, where heat partially melts the binder, the reinforcement ensures the rigidity and the thickness ensures thermal inertia. Membranes applied with a mopping of hot bitumen or cold adhesive should have a minimum thickness of 2.9 mm. Extreme care should be taken when asphalt mopping membranes thicker than 2.9 mm since the heat capacity of the thicker membranes can drop the temperature of the mopping asphalt below required minimums before a satisfactory bond is achieved.
.6 Cant Strips:
Cants are not necessarily required where it is certain that no differential movement will occur at the joint; or in heat welded systems. However, they are considered standard practice in asphalt or adhesive applied assemblies. Whenever cant strips are used, do not adhere the membrane base sheet to them.


.1 Deliver and store materials in original packages and containers with manufacturer's seals and labels intact.
.2 Store rolls on end; selvage end up; do not store in a leaning position.
.3 Elevate from contact with ground and moisture.
.4 Handle in such a manner to ensure membranes remain dry prior to and during installation.


.1 Minimum ambient application temperature:
  • hot asphalt-appliedj +5°C (+41°F) including wind chill
  • torch-applied determined by worker's tolerance
  • adhesive-applied contact membrane manufacturer
.2 Chemical incompatibility: SBS modified bitumen products are not compatible with coal tar pitch, and not resistant to oil and petroleum products. Contact Siplast / Icopal for specific requirements.
.3 Insulations: modified bitumens can be used with most common insulations used for roofing and installed according to< RoofStar Guarantee Standards.

STANDARDS AND APPROVALS (for specific membranes or assemblies consult manufacturer)

.1 Canadian General Standards Board: 37-GP-56M (Grade, Type, and Class vary with membrane)
.2 Underwriters Laboratories: Class A, B, C.
.3 Underwriters Laboratories of Canada: Referenced to cULus
.4 Factory Mutual: Class 1 Fire and I-90 Windstorm or greater.
.5 Other: Avis Technique, Agreement, DIN, ASTM.


.1 Applicator training: Siplast membranes are applied by approved applicators only.
.2 Technical service: technical representatives are available for consultation and field training; owners, architects, and engineers are assisted in the selection and proper use of Siplast materials by technical representatives.
.3 Specification / Drawings: complete specifications and detail drawings are available upon request.


.1 Torches: only torches with a trigger handle designed for the purpose of torching roofing material are acceptable.


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.


PA-311 Membrane Adhesive
PA-828 Flashing cement, vertical membrane adhesive
PA-1021 Plastic Cement.
PA-1125 Asphalt Primer.
PA-100 Mopping Asphalt (Type IV)
PA-1000 Modified Mopping Asphalt (Type IV).


Paratread Protective course for high traffic areas.
Trafbloc Rubber chip protection surface.
Paraslope Asphalt encapsulated compressible aggregate for ponded areas
PC-227 Elastomeric roof coating
PS-304 Elastomeric sealant.
Parapro Flashing Resin PMMA resin liquid membrane flashing system.
(1) NWF - Non-woven fibreglass
(2) WF - woven fibreglass scrim
(3) NWP - non-woven polyester
(4) Consult Siplast / Icopal whenever using / specifying adhesives.
.1 Primer: asphalt primer conforming to CGSB 37-GP-9M
.2 Asphalt: roofing asphalt conforming to ASTM D312-78 Type 4; CSA A123.4-M1979 Type 3 is acceptable on slopes less than 1:24 (1/2" in 12").
.3 Roofing caulking: PS 304



.1 Apply roofing materials over clean, dry surfaces in accordance with good roofing practices of the RGC.
.2 Ensure moisture, in any form, is completely removed from the substrate prior to membrane application.
.3 Prime all metal flashings to be installed in the membrane and allow primer to dry prior to installation.


.1 Beginning at the low point of the deck, apply the membrane base sheet to the substrate using a minimum side lap of 65 mm (2-1/2") and an end lap of 150 mm (6"). Stagger end joints. Terminate the base sheet at the top of the cant strip. Do not adhere base sheet to cant strip.
.2 Beginning again at the low point of the deck fully adhere the membrane cap sheet to the base sheet. Lap side joints 65 mm (2-1/2") and end joints 150 mm (6"). Stagger end joints between plies of membrane so that at no location will the distance between joints of the bottom ply and the top ply be less than 300 mm (12").
.3 Provide a smooth application, free of air pockets, wrinkles, fishmouths or tears.