I have to fix a metal top rail to an opening that was for a patio door before an extension was added to my bungalow. The bungalow was built in 1969 and I know the outer skin has a steel RSJ and I assume the inner skin is a concrete lintel. The manufacturer recommends three inch screws "in appropriate fixings". I will try a masonry drill but what fixings should I use? The rail has to take the weight of three doors. Hope someone can help. Tonyonly
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