[en] The β-decay half-life of ²⁶Si was measured with a relative precision of 1.4.10^-3. The measurement yields a value of 2.2283(27) s which is in good agreement with previous measurements but has a precision that is better by a factor of 4. In the same experiment, we have also measured the non-analogue branching ratios and could determine the super-allowed one with a precision of 3%. The experiment was done at the Accelerator Laboratory of the University of Jyvaeskylae where we used the IGISOL technique with the JYFLTRAP facility to separate pure samples of ²⁶Si. (orig.)