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Once a RaZberry is fitted, is the Pi's I2C bus still available?

I currently have some I2C based sensors wired to my Pi. I'd like to keep these and integrate more remote sensors/switches using z-wave.

Thanks

RaZberry ocupies only 5x2 pins (from the outer side) of all pins. All other pins can be used for your own tasks. Please refer to Raspberry Pi h/w specification if other pins can do I2C for you.

In the documentation it is stated that Razberry uses the serial interface.
I would assume that only pins 1 (3V3), 6 (Ground), 8 (TXD) and 10 (RXD) are required.
Or are the LEDs controlled by other ports, or is 5V also connected?
I have a breakout board which I want to use in conjunction with Razberry, so I need to connect those lines which are needed to the razberry and make sure the other software doesn´t use those pins.

The software uses only the four pins you mentioned. But the pin header fits in 2x5 pins, where 6 pins are simply not connected and can be used by your apps.