Saint-Gobain has secured strong approval from CSR shareholders for a $4.3 billion buyout despite disquiet from some investors that the price was too low.

The $9 per share takeover gives the French group ownership of brands including Gyprock plasterboard, PGH bricks and pavers, Monier roof tiles and Hebel building blocks. It also hands it a 25 per cent stake in the Tomago aluminium smelter in NSW.