Sikalastic -650

Manufacturer: Sika 

Materials: Silane Terminated Polyether 

Sikalastic -650 consists of the following components:

• Sikalastic -650 — a one-part, solvent-free, isocyanate-free, moisture-triggered, silane terminated polyurethane
• Sikafleece 120 — a needle-punched polyester reinforcement
• Sika Bonding Primer — a two-part primer for the preparation of porous substrates
• Sika Concrete Primer — a two-part primer for the preparation of concrete substrates
• Sikalastic Metal Primer — a two-part primer for the preparation of metal substrates.

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Number: 18/5545
Issue date: 04/07/2018

Approved for use on

Flat Roofs Pitched Roofs 

For use as a polyester-reinforced waterproofing on flat roofs with limited access.


Concrete Insulation Boards Mastic Asphalt PUR or PIR Insulation Reinforced Bituminous Membranes Steel Timber 

Sikalastic -650 is satisfactory for use as a waterproofing system on flat and pitched roofs with limited access on:
• concrete (primed and unprimed)
• asphalt (primed)
• bituminous roofing membranes, including mineral surfaced
• galvanized steel (primed)
• non-mineralised bitumen roofing membranes on plywood
• liquid-applied bituminous roof coatings
• aluminium paint
• polyisocyanurate (PIR) foam insulation boards in conjunction with a Sika approved carrier membrane
• existing polyurethane coated roofs.


25 Years 

When installed, Sikalastic -650, will achieve an initial life expectancy of at least 25 years.

Installation Requirements

Installation of the system must be carried out only by specialist roofing contractors trained and approved by the Certificate holder.

Fire Safety

When tested to DD CEN/TS 1187 : 2012, and classified in accordance with BS EN 13501-5 : 2005:

  • a system comprising a primed 12 mm plywood substrate, a layer of S-Vap 7000E DP vapour control layer, a 25 mm thick Decotherm polyisocyanurate board bonded with a polyurethane adhesive, a coating of Sika Primer 610, a layer of S-Vap 7000E DP acting as a carrier membrane, a base coat of Sikalastic -650 at an application rate of 1.3 ℓ·m–2, a layer of Sikalastic Fleece 120, and a top coat of Sikalastic -650 at an application rate of 0.7 ℓ·m–2 achieved a BROOF(t4) classification
  • a system comprising a 9 mm calcium silicate board, a base coat of Sikalastic -650 at an application rate of 1.3 ℓ·m–2 and a top coat of Sikalastic -650 at an application rate of 0.7 ℓ·m–2 achieved a BROOF(t4) classification.

The designation of other specifications, eg when used on combustible substrates, should be confirmed by: England and Wales — test or assessment in accordance with Approved Document B, Appendix A, clause 1. Scotland — test to conform to Mandatory Standard 2.8, clause 2.8.1(1)(2) (1) Technical Handbook (Domestic). (2) Technical Handbook (Non-Domestic). Northern Ireland — test or assessment by a UKAS-accredited laboratory, or an independent consultant with appropriate experience.

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Sika House
Miller Street

T : 01772 259781

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