<p>An autoclaved fibre cement product comprising, cellulose fibres, cementitious material, and 1 % to about 40 % of magnesite on a dry weight basis. In preferred embodiments the percentage of cellulose fibres is in the range from 7 % to 8.5 % and the magnesite in a preferred range of between 25 % to 40 %. Silica and portland cement may also be included.</p>
