Elastomeric SBS highperformance sheets

Styrene-butadiene-styrene polymer-modified bitumen sheets have greater elasticity than standard oxidised bitumen sheets. They are laid either by the traditional pour-and-roll technique, which is used for standard bitumen sheets, or by torching-on (Fig. 6.3). In the pour-and-roll process, bonding bitumen is heated to between 200 and 250°C and poured in front of the sheet as it is unrolled, giving continuous adhesion between the layers. In the torching-on process as the sheet is unrolled, the backing is heated to the molten state with propane burners. Alternatively, cold adhesive or mechanical fastening may be used.

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