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Most steel lintels for simple construction are an inverted T or I shape allowing for at least 1 course of bricks to be laid in front of the central portion of the steel, thats more than enough depth along with the plasterboard to affix these to. You are very unlikely to have a continuous length...

spongy Don't use anything that expands butterfly type wings behind the cavity as they might seem attached really firmly but all the weight will be held by the plasterboard. I had exactly the same issue last year and eventually settled on using these fixings which go far enough into the wall...